《參同契分章註》

The Can Tong Qi Fen Zhang Zhu (Chapter-by-Chapter Commentary on the Triplex Unity) stands as a pivotal exegetical work on the Daoist classic Zhouyi Cantongqi (The Triplex Unity), employing a systematic chapter-commentary approach to elucidate this foundational Neidan (internal alchemy) text. The complete work comprises thirty-five chapters divided into upper, middle, and lower sections, forming a coherent structural whole.

The fifteen-chapter upper section expounds alchemical principles from a macro perspective: The opening Dayi Zongxu Zhang (Great Change Overview Chapter) establishes the relationship between Yijing studies and alchemical practice, while Qiankun Shewei Zhang (Heaven-Earth Positioning Chapter) discusses cosmic Yin-Yang orientation. Riyue Xuanxiang Zhang (Sun-Moon Manifestation Chapter) employs celestial movements as metaphors for firing times in elixir refinement. Core chapters reveal essential techniques—Lianji Liji Zhang (Self-Cultivation Foundation Chapter) emphasizes mental discipline as the groundwork, and Longhu Liangxian Zhang (Dragon-Tiger Dual Crescents Chapter) explains the harmonization of lead and mercury (alchemical terms representing Yin and Yang qi). The section concludes with Shuihuo Qingxing Zhang (Water-Fire Affinity Chapter) on the principle of aqueous-fire equilibrium in alchemical processes.

The middle section's fifteen chapters focus on practical cultivation: Yinyang Jingqi Zhang (Yin-Yang Essence-Qi Chapter) analyzes the operation of primordial qi (the foundational life-energy in Daoism), while Huishuo Hefu Zhang (New Moon Conjunction Chapter) correlates lunar phases with optimal timing for alchemical procedures. Key passages include Guanjian Sanbao Zhang (Three Treasures Pivot Chapter) on the vital importance of jing (essence), qi, and shen (spirit), Chanü Huangya Zhang (Maiden-Yellow Sprout Chapter) revealing the mystery of elixir formation, and Sizhe Hundun Zhang (Quaternary Chaos Chapter) depicting the primordial state of Yin-Yang interaction.

The concluding five-chapter lower section synthesizes and elevates: Shengxian Fulian Zhang (Sage Refinement Records Chapter) documents ancient immortals' cultivation deeds, Faxiang Chenggong Zhang (Law-Pattern Accomplishment Chapter) demonstrates how alchemy mirrors cosmic principles, and Dingqi Miaoyong Zhang (Cauldron Mysterious Function Chapter) details the subtleties of furnace management. The final Zixu Qihou Zhang (Author's Epilogue Chapter) presents the writer's motivations while inspiring future practitioners.

Framed within the Yijing's hexagram theory and integrated with Huang-Lao philosophy, the text systematically presents both Waidan (external alchemy) and Neidan systems. Its metaphorical chapter titles—employing terms like "dragon-tiger" and "maiden" as coded references to alchemical components—make this an indispensable resource for studying Daoist alchemical theory and practice.

This scripture passage primarily discusses the opening section of the Zhouyi Cantongqi (The Seal of the Unity of the Three) concerning the "Qian (Heaven) and Kun (Earth)" hexagrams, along with the development of the Yijing (Book of Changes) by sages like Fuxi and the Yellow Emperor. Here is a simplified interpretation:

The Zhouyi Cantongqi begins by stating that Qian (Heaven) and Kun (Earth) are the "gate and door" of the Yijing, much like the entrance and exit of a house, and they are also the parent hexagrams of the sixty-four hexagrams. The Kan (Water) and Li (Fire) hexagrams function like the axle and frame of a cart, working in tandem with the four primary hexagrams (Qian, Kun, Kan, Li) to operate like a bellows, opening and closing in harmony. This embodies the principles of Yin-Yang transformation, akin to driving a cart by following the reins and staying on the proper path.

The text mentions that a year consists of twelve months (with "five-six" referring to thirty days), and sixty days form a cycle, where Yin and Yang, hardness and softness, interact in harmony. From the new moon to the full moon, morning and evening each correspond to a hexagram, cycling endlessly. The movements of the sun and moon follow a pattern, with spring, summer, autumn, and winter each occupying their proper positions. This is like a ruler dispensing rewards and punishments in accordance with the seasons, or the alternation of day and night aligning with the rhythms of heat and cold. The wisdom in the hexagram lines is as orderly as the progression of the four seasons and the Five Phases (Wood, Fire, Earth, Metal, Water).

Fuxi, upon seeing the Hetu (the legendary diagram carried by a dragon-horse), created the Bagua (Eight Trigrams). The Yellow Emperor, Yao, and Shun modeled their governance on the Dao of Qian and Kun. The Guicang Yi of the Xia dynasty began with the Kun hexagram, the Lianshan Yi of the Shang dynasty started with the Gen (Mountain) hexagram, and King Wen of Zhou’s Zhouyi placed Qian and Kun at the forefront. Confucius, in the Yizhuan (Commentaries on the Yijing), stated that Qian and Kun are the gate and door of the Yijing: Qian represents Yang’s firmness—still, it is unified; in motion, it is steadfast. Kun represents Yin’s softness—still, it is closed; in motion, it unfolds. Master Wei Boyang (author of the Cantongqi) deeply grasped the true intent of these three sages and wrote this book to elucidate the Dao of the Yi.

The commentator Shangyangzi explains: Qian represents Yang Qi (vital energy) and is the gate of the Yi; Kun represents Yin Qi and is the door of the Yi. Without this gate and door of Qian and Kun, the Taiji (Supreme Ultimate) could not differentiate, Heaven and Earth could not be established, the sun and moon could not shine, the myriad things could not be transformed, and the sages could not propagate the Great Dao. When Qian moves with steadfastness, it generates Yin; when Kun moves with unfolding, it generates Yang. This is the fundamental principle of Yin-Yang transformation.

This passage explains the principle of Yin-Yang transformation generating all things in the Zhouyi (Book of Changes). In the beginning of undifferentiated chaos, it was called "Taiji" (Supreme Ultimate). The Taiji divided into the two modes of Yin and Yang, whose interaction produced the Li trigram (symbolizing fire) and the Kan trigram (symbolizing water). Confucius said the pattern of the Yijing begins with Taiji, giving rise to the two modes, four images, and eight trigrams.

When the pure Yang energy of the Qian trigram (pure Yang) first acts upon the Kun trigram (pure Yin), it produces the Fu hexagram. Within Fu is nurtured the Zhen trigram (thunder), which then evolves into the Shi hexagram. Within Shi is nurtured the Kan trigram (water), which subsequently transforms into the Qian hexagram, within which is nurtured the Gen trigram (mountain). Thus, the three Yang trigrams—Zhen, Kan, and Gen (called the "Three Sons")—are all born from the Kun trigram.

Conversely, when the Yin energy of Kun first acts upon Qian, it produces the Gou hexagram. Within Gou is nurtured the Xun trigram (wind), which evolves into the Tongren hexagram. Within Tongren is nurtured the Li trigram (fire), which then transforms into the Lü hexagram, within which is nurtured the Dui trigram (lake). Thus, the three Yin trigrams—Xun, Li, and Dui (called the "Three Daughters")—are all born from the Qian trigram.

When Yin and Yang interweave and interact, Qian acting upon Kun again produces the Lin hexagram, which evolves into Tai, then into Dazhuang, and finally into Guai—this is the process of Yang energy actively seeking Yin. When Kun responds to Qian again, it produces the Dun hexagram, which evolves into Pi, then into Guan, and finally into Bo—this is the process of Yin energy responding to Yang. In this way, Qian gives birth to the Three Daughters and Kun to the Three Sons; their mutual interaction, like that of husband and wife, generates the transformations of the sixty-four hexagrams. Thus, Qian and Kun are the parents of all hexagrams.

The Kan and Li trigrams form the framework of heaven and earth: Yang entering Yin forms Li (Yang outside, Yin inside), and Yin entering Yang forms Kan (Yin outside, Yang inside). Kan and Li inherit the essence of Qian and Kun, becoming the framework for the movement of Yin and Yang, like spokes revolving around the hub of a wheel. Qian and Kun are the central axis, while Kan and Li are the spokes, together forming the operating system.

Using the metaphor of female and male (Yin and Yang): the female represents the totality of Yin phenomena, the male the totality of Yang phenomena. The four trigrams—Qian, Kun, Kan, and Li—function like a bellows (tuoyue), with the two energies of Yin and Yang opening and closing within them. The closing of the bellows symbolizes the gate of Yin, its opening the door of Yang—the entire cosmos is like a great bellows. The principle that generates all things is called "creation," and that which generates humanity is called "humanity." This is the root of the Dao of Yin-Yang transformation.

In Daoist cultivation, those who transcend the ordinary and attain the sage's realm are called "sages among sages." Such individuals excel at grasping the patterns of cosmic creation and are masters of applying the principles of Kan (Water trigram) and Li (Fire trigram) from the Bagua (Eight Trigrams), representing the harmonious interaction of Yin-Yang.

Mastering the Dao of creation is like a skilled craftsman using plumb lines and ink markers to establish perfect measurements—nothing remains unaccomplished. Applying the Kan-Li principle resembles holding the reins of a chariot while following well-worn ruts—no destination remains unreachable. Sages hold the operational laws of the cosmos in their hands, manifesting all transformations through their being. They excel at grasping the core to govern external phenomena, comprehending musical temperament and calendrics to understand the numerical patterns of celestial movements.

In musical temperament (律), "temperament" corresponds to nature's rhythmic changes, while "calendrics" (历) records the cyclical periods of celestial motion. When Yang Qi first emerges, the musical note Huangzhong (first of the twelve temperaments) resonates, completing a celestial cycle from the Hour of Zi (midnight) to Hai (late night). Thus when the annual cycle concludes, Yang Qi regenerates again at the Hour of Zi. Each lunar month divides into six solar terms (two terms forming one month), five days constitute a climatic phase, and six phases complete a thirty-day month. Each day's twelve two-hour periods correspond to the twelve lines of two hexagrams (six lines per hexagram), so two hexagrams serve as the warp and weft of a day, while sixty hexagrams form the complete monthly system.

The scripture cites the examples of the Zhun hexagram (Zhen below Kan above) and Meng hexagram (Gen below Kan above): Zhun symbolizes the eldest son (Zhen trigram) restoring Yang Qi within Kan to perform generative work, while Meng represents the youngest son (Gen trigram) consolidating Kan's Yang Qi for nurturing effects. Using one hexagram each for day and night, all sixty hexagrams embody the growth and nourishment principles of Yin-Yang interaction.

The moon's phases (new and full) mark a month's beginning and end, while morning and evening's movement and stillness reflect the day's rhythm. Seasonal changes determine the year's rewards and punishments—bestowing rewards for fostering goodness and administering penalties for destruction, all following the standards of benevolence and righteousness, the measures of joy and anger, in accordance with the Five Phases (Wood, Fire, Earth, Metal, Water) and seasonal patterns.

This passage collectively expounds the core philosophy of the Cantongqi: Using Qian (Heaven) and Kun (Earth) as the gateway to understanding the Yijing, rather than directly discussing elixir ingredients and firing times. Though hundreds of commentators have interpreted it through history, few achieved deep comprehension. Only Peng Xiao (Zhen Yizi) truly understood the relationship between firing process and ingredients, yet his explanations lacked systematic organization, interpreting every chapter as concerning ingredients and firing, every section as describing alchemical practice. Later interpolations may have been mixed in, but in truth, the immortal Wei Boyang's masterpiece contains no repetition: the upper section elucidates the essentials of Yin-Yang transformation in forging the Golden Elixir (Jindan), while the middle section details celestial revolutions, nurturing fire phases, and crucial precautions.

The Zhouyi Cantong Qi is divided into three sections—upper, middle, and lower—each with distinct emphases. The lower section focuses on the concrete methods and symbolic meanings of alchemical practice. The upper section systematically explains the cultivation process step by step, while the middle section enumerates key points in separate entries. These three parts each form their own coherent system and should not be confused.

Shang Yangzi, the commentator, deliberately structured his annotations with clear divisions: he split the upper section into fifteen chapters, corresponding to the first quarter moon (7th–8th lunar day), symbolizing the initial realization of alchemical principles. The middle section is also divided into fifteen chapters, matching the last quarter moon (22nd–23rd lunar day), representing the stage of perfected elixir formation. The lower section’s five chapters align with the complete numerical logic of the Five Phases (Wood, Fire, Earth, Metal, Water). This organization groups related content together for easier comprehension.

The original intent of Wei Boyang (the Immortal Elder) was to gradually unfold the profound mysteries of the Golden Elixir (Jindan) through layered exposition, using arcane language to directly reveal the Great Dao. He meticulously explained the relationship between the medicinal fire (refining temperature), the cauldron and vessel (alchemical tools), and the creative transformations of Heaven and Earth, enabling later practitioners to grasp these principles and attain transcendence through cultivation. However, some orally transmitted secrets between masters and disciples were too profound to be fully disclosed in writing.

Alas! People today lack virtue and are quick to slander and doubt. Thus, the ancient sages composed their teachings with great caution, never carelessly revealing celestial secrets. Instead, they dispersed the true Dao across classical texts. For instance, the Zhouyi transmitted by King Wen and Confucius, the Golden Elixir teachings passed down by the Yellow Emperor and Laozi, and the Mahayana Buddhism taught by Shakyamuni and Bodhidharma—all ultimately expound the same truth. The sages used different methods to guide beings, all aiming to help people realize this fundamental principle: it is the ferryboat across the sea of suffering and the ladder to eternal transcendence.

Yet later generations cling to their own narrow views: some see the Zhouyi and assume it is merely a book of divination, unaware it conceals the principles of Yin-Yang harmony; others hear of "cauldrons and vessels" and imagine tools for smelting metals and minerals; they hear of "gathering medicinal ingredients" and think of dark arts; they hear of "active methods" and dismiss them as heterodox; they hear of "non-action (Wuwei)" and mistake it for empty meditation; they hear of "Mahayana" and obsess over Zen abstractions. They fail to understand that the sages transmitted the Dao by using Yin-Yang cultivation to transcend Yin-Yang, using worldly methods to attain the supramundane. How could such people ever fathom the profundity of the Cantong Qi?

When Wang Chongxi attained the Dao after receiving the Golden Elixir secrets from Liu Haichan, he once sighed: "Among all cultivators in the world, only Zhang Boduan (Pingshu) truly grasped this truth." Zhang Boduan encountered his master in Chengdu and was transmitted the genuine teachings...

The Wuzhen Pian (Awakening to Reality) is a classic written specifically for later generations of practitioners. Its content is thorough and sincere, with profound passages that fully resonate with the Cantong Qi (Token for the Agreement of the Three).

After receiving authentic teachings from his master, Shangyangzi (Zhang Boduan, patriarch of the Southern Lineage of Daoism) traveled extensively across the land to study widely. He discovered that most of what circulated in the world were empty and misleading words. As stated in the Niwancuixu Pian (Jade Emerald Treatise of the Muddy Pellet): "When I later went to practice Chan, I saw through countless false practitioners." Today, genuine cultivators like Zhang Boduan (Pingshu) are nearly nonexistent, and enlightened masters like Wang Chongyang (Chongxi) are even harder to find. The world is now filled with those who idly discuss Chan principles or show off petty cleverness—truly entering the Daoist path and comprehending the sages' real meaning is something not one in a hundred million can achieve. This shows that Wang Chongyang's words stem from genuine enlightenment, while the lament in the Cuixu Pian feels all the more poignant. The ancients said: "Those who talk about the Dao are as numerous as ox hairs, but those who awaken to it are as rare as rabbit horns." How much rarer still are those who actually practice and verify it? A predecessor once remarked: "The foolish neither understand the Dao nor listen to its principles—they merely laugh upon hearing it. Those with wisdom grasp its essence upon hearing it." If someone were to ask today, "What exactly is this essence?" and you directly told them it is "the gateway where Yin and Yang emerge and withdraw," such an explanation would only deepen their confusion.

The Qiankun Shewei Zhang (Chapter on Heaven and Earth Establishing Their Positions) states: "Once Heaven and Earth establish their positions, the transformations of Yin and Yang unfold within them." Here, "Heaven and Earth" symbolize Qian (Heaven) and Kun (Earth), while "establishing positions" refers to the arrangement of Yin and Yang in complementary positions. "Change" (Yi) refers to the hexagrams Kan (Water) and Li (Fire), which embody the two functional modes of Qian and Kun. These two modes have no fixed positions—they circulate through the six directions, rising and descending without set patterns, hidden yet suddenly manifesting, encompassing the laws of all transformations. The true Dao is like a formless vessel: though empty, it holds the myriad things. Thus, one must observe the waxing and waning of Yin and Yang—Kan and Li may seem to vanish, yet they endure eternally. These principles are not spoken lightly; they are verified through actual experience. By observing natural phenomena and cross-referencing the original meanings of the texts, their truths become clear. For example: Kan corresponds to the essence of the moon (Wu Earth), while Li corresponds to the radiance of the sun (Ji Earth). The combination of sun and moon forms the character Yi (易), symbolizing the balance of firm and yielding. The central Earth Qi (Tuqi) permeates the four seasons, sustaining the operations of the four directions (Azure in the East, Cinnabar in the South, White in the West, and Black in the North)—all relying on the pivotal role of the central palace's Wu and Ji Earth.

The Shiyi·Xici (Ten Wings·Appended Judgments) states: "Heaven is lofty, Earth is lowly; Qian and Kun thereby fix their positions." The Immortal Elder (referring to Wei Boyang) explains: "Heaven and Earth establish their positions, and the transformations of Yin and Yang unfold within them." He further annotates: "'Heaven and Earth' symbolize Qian and Kun; 'establishing positions' means arranging the complementary positions of Yin and Yang; 'Change' refers to the hexagrams Kan and Li, which are the two functional modes of Qian and Kun." These discussions are remarkably detailed, composed with utmost sincerity.

Many find this principle difficult to comprehend, considering it overly profound. Yet the Book of Changes (Yijing) simply illustrates the alternating patterns of Yin and Yang, the interplay of strength and suppleness. The Qian hexagram (representing Heaven, Yang) employs the number nine, while the Kun hexagram (representing Earth, Yin) uses six—each has distinct functions and positions.

The phrase "a flock of dragons without a leader" in Qian's ninth line symbolizes the noble person attaining the highest realm of practicing the Dao. Kun's sixth line, "beneficial through perpetual constancy," embodies the way of Earth, the wife, and the minister—Earth appears to achieve nothing, yet it carries all things to completion. Kun alone, without Yang, cannot accomplish anything; it must follow Qian to manifest its function. Just as Qian's nine cooperates with Kun, finding companionship in the southwest (Kun's position).

The mutual transformations of Qian and Kun shape the inherent nature of all things. Qian's primordial Qi (Taishi) employs nine to bear Kun, with Yang containing Yin to form the Li hexagram (Fire). Kun's original energy (Taiyi) employs six to receive Qian, with Yin containing Yang to form the Kan hexagram (Water). Kan and Li epitomize the essential transformations of Yin and Yang.

This transformation never ceases, like the moon's phases—waxing, full, waning, and new—or the constant circulation of Yin and Yang Qi within the human body, shifting from the state of Taiji (Supreme Ultimate) to endless variations. The principle of the Book of Changes is perpetual motion; were Qian and Kun to perish, this law of transformation would vanish. Thus, the sages use this principle to purify the mind, withdrawing into stillness—a reverse application of the Yi Dao.

King Wen's Zhouyi assigns six lines to each hexagram, called "six positions forming a pattern" or "circulating through the six voids." The waxing and waning of Yin and Yang have no fixed pattern; rise and fall follow no constant rule. When Qian's first line changes, it becomes Gou; accumulated transformations ultimately lead to Kun. When Kun's first line changes, it becomes Fu; accumulated transformations ultimately lead to Guai. There are also the three male hexagrams (Zhen, Kan, Gen) and the three female hexagrams (Xun, Li, Dui), each interacting and transforming.

Each of the sixty-four hexagrams undergoes cumulative transformations, including the "wandering soul" and "returning soul" hexagrams, totaling eight variations. Through progressive changes, one hexagram can transform into sixty-four, and sixty-four into 4,096. Fu and Gou mutually generate, each inheriting Yin and Yang, giving rise to the myriad phenomena of the world—all manifestations of the Dao of Yin and Yang.

Yin and Yang Qi may lie hidden within the human body, latent in all things, encompassing everything in transformation, or governing life and death as the great framework of the Dao. Without the regulatory function of Qian and Kun's dual application, the Dao might perish. The key to "using non-being to control being" lies in the interplay of "non-being" and "being"—this is the fundamental principle of Taiji differentiating into Yin and Yang.

This passage explores the distinction between the Prenatal (Xiantian) and Postnatal (Houtian) realms, and how cultivation can lead to immortality.

The Prenatal refers to the formless Dao (cosmic origin), representing the return from formed existence to formless essence. The Postnatal constitutes the material world of form, where the formless gives birth to form. Laozi states that "the nameless is the origin of heaven and earth," while "the named is the mother of all things." Master Haichan (a Daoist immortal) also observed that most people only move from the formless to the formed, while few can reverse this process and return from form to formlessness.

All formed things in the Postnatal world are subject to decay—only the Prenatal Dao is eternal. Confucius remarked that the "Prenatal" transcends the patterns of heaven, while the "Postnatal" follows the timing of nature. Ordinary people can only follow the Postnatal path, thus remaining trapped in the cycle of life and death. Sages, however, reverse the process by applying Prenatal principles—through investigating phenomena, refining knowledge, and cultivating body and virtue—to attain longevity.

The author emphasizes that this text is the "foundational scripture of the Dao," with every phrase carefully considered, unlike the speculative works of other philosophical schools. It cites examples such as the Yellow Emperor’s ascension, Laozi’s transformation into the Buddha, and the Duke of Huainan’s household rising to immortality to prove the validity of cultivation.

Regarding practice, one must grasp the principles of Yin-Yang transformation: within the Kan trigram (symbolizing water) lies Yang earth (Wu), representing lunar essence, while within the Li trigram (symbolizing fire) lies Yin earth (Ji), embodying solar radiance. Practitioners must understand the mutual interchange of Yin and Yang—moving with them generates life, reversing them refines the Golden Elixir (the elixir of immortality).

This scripture elucidates the pivotal role of Earth (土) within the Yin-Yang and Five Phases (五行) system, while exploring the celestial dynamics between the sun, moon, and cosmic forces.

The text employs the mythical "three-legged crow" (三足乌) – a solar deity – as a metaphor for the sun, noting its radiant exterior concealing inner darkness, embodying the principle of "Yin within Yang" (阳中之阴). Ancient sages used the character "易" (Change) to symbolize the sun and moon, encapsulating the transformative interplay of Yin-Yang. Yet directly discussing Yin-Yang risks obscuring the essence of Change, while focusing solely on Change may neglect concrete Yin-Yang relationships.

All life depends on Earth's nourishment, just as celestial movements remain tethered to terrestrial patterns. The sun rises through the Earth-associated Di constellation (Eastern Azure Dragon), sets via the Wei constellation (Western White Tiger), traverses south past the Liu constellation (Southern Vermilion Bird), and moves north through the Nü constellation (Northern Dark Tortoise). Celestial bodies derive enduring radiance from Earth's support, while Earth accumulates De (德, Virtue/Power) through their cyclical motions.

Earth-Virtue governs seasonal transitions: spring's germination and summer's growth rely on Earth's potency, as do autumn's harvest and winter's dormancy. Though the four cardinal directions manifest distinct colors – green (Wood), red (Fire), white (Metal), and black (Water) – all depend on the central Wuji Earth (戊己土, celestial stem Earth phases) for functional expression. This passage particularly emphasizes how cosmic order requires Earth-Virtue to actualize creation when Yin-Yang occupy their proper positions.

Subsequent sections decode Yin-Yang transformations through celestial mechanics. The Yijing (易经) reveals cosmic principles through hexagrams, with sun-moon symbolism being most prominent. Yin-Yang interactions resemble turning wheels, where the 384 hexagram lines mirror celestial rhythms. During lunar conjunctions (晦朔之交), the Zhen trigram (震卦, representing east and spring) initiates new Qi cycles. Here heaven-earth unite as sun-moon converge: Yang disperses essence while Yin gestates life, establishing new foundations within primordial chaos. As Confucius observed, seasonal transitions and celestial movements constitute heaven's most eloquent demonstrations of fluid adaptability. Through solar-lunar patterns, the text unveils the fundamental mechanics of Yin-Yang alternation and universal generation.

This scripture elucidates the characteristics and functions of the sun and moon in celestial movement. The sun embodies pure Yang Qi (the primordial Yang energy of the cosmos), while the moon represents pure Yin Jing (the primordial Yin essence of the universe). The celestial sphere completes one full rotation of 365 and 1/4 degrees, with the sun moving 1 degree daily to form a 30-day month; the moon travels approximately 13 degrees each day, completing its circuit in slightly over 27 days.

The sun serves as the primordial Qi source of heaven and earth, with a diameter of about 845 li, radiating intense Yang energy to nourish all living things. Its path doesn't strictly follow the ecliptic (the sun's apparent path) or celestial equator, but rather traverses both: during summer's longer daylight hours it shifts northward toward the equator, while in winter's shorter days it moves southward. The northern direction is termed "inner" because it contains the Purple Tenuity Enclosure (the celestial abode of the Heavenly Emperor), whereas the southern direction is considered "outer."

The moon, measuring approximately 670 li across, carries Yin energy to facilitate the gestation of all beings. Its orbit also deviates from the ecliptic and celestial equator, moving within the 24-degree angle formed by their intersection while maintaining about 6 degrees from the ecliptic. Though the moon emits no light itself, it functions like a lacquered black sphere beneath eaves that reflects sunlight—illuminating only the portion facing the sun, which explains why we always observe one bright and one dark hemisphere. During full moon (the "wang" phase), when sun and moon oppose each other, the reflected light fully faces Earth; during new moon (the "hui-shuo" phase) when both celestial bodies align, the illuminated side turns away from Earth, rendering the moon invisible.

Through these astronomical phenomena, the text demonstrates Daoism's core principle of "Yin-Yang mutual rootedness," using the sun and moon's movements to symbolize the profound interplay of cosmic energies between heaven and earth.

This passage explains the principles of lunar phases and the transformations of Yin and Yang. The moon itself does not emit light; what we see is actually sunlight reflected off its surface. When the moon is 25 degrees from the sun, a faint glow becomes visible; at over 90 degrees apart, we see a half-moon (called a "quarter moon"). After the full moon, the light gradually wanes. The ignorant believe the moon is blocked by the earth when facing the sun, but in truth, though heaven is high and earth distant, the Qi of Yin and Yang, while seemingly obstructed, secretly interconnects. The shadows on the moon are actually the earth's silhouette.

The sun is vast yet distant, while the moon is small yet close—its endless transformations reveal the profound mystery of the Great Yin (the moon). To comprehend these wonders is to grasp the patterns of change.

The Zi hour (11 PM–1 AM) marks the initial stirrings of Yang, which peaks during the Si hour (9–11 AM). The Wu hour (11 AM–1 PM) sees the first emergence of Yin, culminating in the Hai hour (9–11 PM). As heat and cold alternate, warmth and coolness balance—Yin and Yang wax and wane like the spokes of a wheel: when Yin contracts, Yang expands.

The Book of Changes (Yijing) contains 384 lines (six per hexagram, three marks per line), with each day corresponding to two hexagrams totaling 36 marks. The interaction of Yin and Yang need not be prolonged—just as a two-hour "watch" (shí) contains three marks, often only one is needed. When a single mark activates, Yang energy first emerges beneath the pure Yin of the Kun hexagram, forming the Zhen hexagram (one Yang line beneath two Yin lines). Here, heaven and earth unite, nurturing all things; sun and moon attract like the entwined Jade Rabbit and Golden Crow (ancient myths describe the sun as housing a golden crow and the moon a jade rabbit). Robust Yang bestows transformation while yielding Yin receives it—both merge indistinctly within primordial chaos.

The term quanyu ("weight and axle") is revealing: ancients began scales with the counterweight (quan) and carts with the axle (yu), symbolizing creation's initial state. Quan represents provisionality; yu embodies stability—showing how creation requires both flexibility and steadfastness. The first stirrings of primordial Qi gestate the embryo, condensing Yang essence (Jing) into form. This passage describes the orderly, generative beginnings of Yin and Yang after the division of the Supreme Ultimate (Taiji).

This scripture primarily elucidates the principles governing the generation and transformation of all things between heaven and earth, and how sages observe celestial phenomena to comprehend these patterns.

Though humans can procreate all beings, the growth and transformation of all things fundamentally follow natural laws. Ordinary people often fail to understand the principles of postnatal operation—just as the Dawn Hexagram (Zhun, symbolizing the birth of all things) and Dusk Hexagram (Meng, symbolizing enlightenment) each have their foundational roots. Some mistakenly believe this refers merely to transformations within an alchemical furnace, but this is not so.

Sages comprehend the Dao of Heaven by observing celestial phenomena. Confucius (Zhongni) marveled at the primordial chaos of creation, where the De (Virtue) of Qian (Heaven) and Kun (Earth) proved profoundly inscrutable. Investigating the era of the Primal Sovereign, he found it resembled the marital union described in the "Guanju" poem—where Yin and Yang energies intermingled, initiating the sprouting of all beings. Sages do not emerge arbitrarily; they discern the patterns of celestial operation through astronomical observation.

The Dao of Heaven operates through advancement and withdrawal, contraction and expansion, corresponding with seasonal rhythms. The Book of Changes governs the Heart of Heaven, with the Fu Hexagram (symbolizing Yang energy's renewal) marking the beginning of all creation. Like an eldest son inheriting his father's legacy while establishing his foundation through maternal connection, the waxing and waning of Yin-Yang resonates with musical harmonics, their ascents and descents regulated by the Northern Dipper.

The text then illustrates Yin-Yang fluctuations through lunar phases: the crescent moon's first appearance on the third day (Zhen Hexagram, western Geng position), the first quarter moon on the eighth day (Dui Hexagram, Ding position, resembling a taut cord), the full moon on the fifteenth (Qian Hexagram, eastern Jia position) when sun and moon shine in dual radiance. The lunar toad (symbolizing the moon) transforms according to hexagram changes, while the jade rabbit (embodying lunar essence) emits its glow. By the sixteenth day, waning begins (Xun Hexagram, Xin position), the last quarter appears on the twenty-third (Gen Hexagram, Bing position), and complete darkness arrives on the thirtieth (Kun Hexagram, Yi position), completing the cycle. Celestial stems (Ren-Gui paired with Jia-Yi) and hexagrams (Qian-Kun) together form the complete temporal cycle.

The numerical correspondences of seven-eight and nine-six interrelate, their quadruple combination yielding thirty—symbolizing the cyclical movement of Yang energy. The Eight Trigrams (Bagua) distribute themselves in orderly arrangement, their operations never straying from the center. Though primordial Jing (essence) remains elusive to perception, its patterns can be verified through calculation. Daily observation of hexagram manifestations and contemplation of their forms establish standards as normative models, enabling divination to foresee fortune and misfortune.

Edicts must accord with seasonal timing, never missing the moment of transformation. Above, one examines the patterns of the River Chart (ancient astral diagram); below, observes terrestrial configurations; between, scrutinizes human hearts—only by synthesizing these three can one penetrate the Dao of Heaven-Earth-Humanity. Action must follow hexagram transformations, while stillness contemplates their judgments. Only through proper application of Qian-Kun's (Heaven-Earth) Dao can the world be well-governed.

Finally, the text references the Yi Jing's statement "The Supreme Ultimate (Taiji) generates the Two Forms"—Confucius's marvel at the state of primordial chaos. The mysterious De of Qian-Kun proves unfathomable, with the Primal Sovereign's era resembling Pangu's separation of heaven and earth. "Guanju" expounds the proper human relationships, prioritizing marital union—Confucius placed poems about husband-wife relationships at the beginning of the Classic of Poetry precisely to rectify the Dao of Yin-Yang.

When Confucius commented on the Book of Changes, he placed the Qian (Heaven) and Kun (Earth) hexagrams at the beginning to illustrate the principle that strength and softness must complement each other. The Great Commentary states that the laws of the Book of Changes align with the movements of heaven and earth, thus encompassing the Dao of the cosmos. By observing celestial patterns above and terrestrial formations below, one comprehends the mysteries of Yin-Yang's manifestation and concealment. By tracing back to the origin, one understands the principle of life and death.

What does tracing back to the origin mean? It means following the Dao of Yin-Yang to understand the birth of all things. Just as the union of man and woman gives life, this is "knowing life." What does returning to the end mean? It means cultivating the innate Dao in reverse, transcending the mundane to attain sagehood. Like plants that appear withered in winter yet harbor new buds, this is "knowing death." When Zilu asked Confucius about death, the sage replied, "How can you know death when you do not yet understand life?"—thus guiding his disciple toward deeper reflection.

Had Zilu pursued the question further, he might have uncovered the Book of Changes' profound teaching: "Following the current leads to death; reversing it brings life." This would have revealed the true essence of harmonizing Dao and De (Virtue/Power), and the method of mastering destiny through exhaustively investigating principles and fully realizing one's nature. Therefore, when sages descend into the world, they meticulously observe the Yin-Yang of heaven and earth: regarding Yin Qi as the "Celestial Seal" (natural law) of the cosmos, and Yang Qi as the "Mandate of Heaven." In the human body, Yin manifests as the "Fire Seal" (vital energy), while Yang manifests as "innate nature and life force."

As Yin and Yang wax and wane, these "seals" become signs of advance and retreat. Recognizing these signs ensures timely action. The principle of the Book of Changes governs the "Celestial Heart" (cosmic core), which corresponds to the rightful position of the Qian hexagram. The Zi hour (midnight) marks the Celestial Heart's manifestation, where Yang Qi first stirs. Though Qian represents Yang, its primordial seal is pure Yin. The hexagram's Yang energy initially sprouts beneath two Yin lines, forming Zhen (the Thunder hexagram, symbolizing the eldest son). The Fu hexagram (one Yang line beneath five Yin lines) is reborn within Kun (the Earth hexagram, symbolizing the mother)—hence the saying "the mother establishes the foundation."

The Huangzhong pitch (first of the twelve musical tones) corresponds to the Zi hour, just as the Big Dipper's rotation begins from the Zi position—both symbolizing Yang Qi's initial stirring. Like the crescent moon's faint glow in the southwest at dusk on the third lunar day, or the first-quarter moon on the eighth day when Dui (the Lake hexagram, symbolizing the west) receives the Ding Fire, with Yang Qi halfway risen like a taut string. At the full moon on the fifteenth, sun and moon oppose each other, moonlight shines fully, and Yang Qi culminates in the Qian hexagram. At dawn on the sixteenth, Xun (the Wind hexagram, symbolizing the southeast) appears in the Xin position as the Yin seal begins enveloping Yang to prevent dissipation. By the last-quarter moon on the twenty-third, the Yin seal has enfolded half the Yang energy.

This passage discusses Daoist cultivation methods involving celestial observation and alignment with natural rhythms, exploring the correspondence between human physiology and the cosmic interplay of Yin-Yang.

During the waning moon phase (22nd-23rd lunar day), when the moon completely disappears, Yin energy reaches its zenith. The northeast corresponds to the Gen trigram (one of the Eight Trigrams/Bagua representing mountain) and the so-called "ghost gate." In the human body, this aligns with the abundance of Gui-Water (one of the Celestial Stems representing kidney essence/Jing). When Yin energy peaks, Yang energy begins to regenerate, mirroring the cyclical transition from the Yin stems Ren-Gui to the Yang stems Jia-Yi.

The Eight Trigrams (Qian, Kan, Gen, Zhen, Xun, Li, Kun, Dui) rotate according to their directional positions, corresponding to the movements of celestial bodies. The "Celestial Heart" (cosmic axis) resembles the central point in a Taiji diagram—though minuscule and barely perceptible, it constitutes the generative source of all things. Ancient sages determined solar terms by observing celestial movements and measuring sun shadows, issuing governance decrees in harmony with seasonal cycles.

The text references celestial patterns shown in the Hetu (ancient astronomical diagram) and Earth's generative qualities, both requiring resonance with the human heart. When humans emulate Heaven and Earth in maintaining balanced activity and stillness, they attain the natural state described in the Qian trigram (pure Yang): "clouds move and rain falls, all beings flow into form." Through astronomical and geographical observation coupled with mental rectification, one opens the gateway for Yin-Yang communion, enabling all things to fulfill their cosmic roles.

The latter section addresses statecraft. Rulers should "renew the cauldron and discard the dross" (reform through alchemical metaphor), grasping essential principles. Star patterns serve as political metaphors—the Five Planets (Wuwei) and Twenty-Eight Constellations (Siqi) illustrate the importance of bureaucratic specialization. The moon's thirty-day cycle (five phases of six days each) symbolizes governance requiring consistent follow-through, as imperial extravagance inevitably leads to decline. Throughout, the text emphasizes the unity of Heaven and humanity, insisting that both state governance and self-cultivation must follow the natural waxing and waning of Yin-Yang.

This passage draws an analogy between the practice of Neidan (internal alchemy, the Daoist method of refining Jing, Qi, and Shen) and state governance, emphasizing that De (Virtue/Power) is the fundamental principle.

When government decrees become chaotic, officials turn corrupt, and conduct deviates from the proper path, it is like the moon's irregular waxing and waning bringing calamities—the state will likewise face misfortune. Conversely, if one aligns oneself like the North Star (Chenji), remaining upright while calmly appointing virtuous ministers, and governs with impartiality like the Mingtang (the ancient imperial hall for proclaiming virtuous policies), the state will not stray from the Dao.

The author, Wei Boyang (Immortal Elder), uses the difficulty of alchemical practice to illustrate the challenges of governance. Cultivating Neidan requires taming wild thoughts like subduing untamed horses and eliminating old habits, just as governing a state demands discarding the outdated and establishing the new. Restraining anger, moderating desires, and emulating the virtuous—these foundational practices of self-cultivation are themselves processes of reform. Whether in governance or self-refinement, one must begin with the subtlest details.

Confucius said, "To govern with De is like the North Star—all other stars revolve around it." For practitioners, benevolence, wisdom, and sincerity are superior virtues, while reverence, tolerance, trustworthiness, discernment, and kindness form the gateway to the Dao. Practitioners must especially prioritize discernment and kindness, for kindness draws people's hearts inward, while internally it nourishes the primordial Qi (the innate vital energy).

Astronomical metaphors are employed: when celestial movements become disordered, the Wenchang Star (governing literary fortune), as the ruling star of the Taiwei Enclosure (a celestial region), resembles the Vermilion Bird (the southern fire deity) within the human body, which governs lifespan. The Xujing Star commands the Three Terraces (symbolizing the Three Dukes), just as the Mingtang (the space between the eyebrows) in the body presides over moral transformation. The faintly visible Dongwei Star, an auxiliary of the Ziwei Enclosure, corresponds to the Mysterious Warrior (the northern water deity) in the body—encountering it promises longevity of a thousand years. Every joint and deity in the body has its designated role, and alchemy is about harmonizing this cosmic creativity, a task even more challenging than governance. Thus, the precise movements of the stars serve as metaphors for its profound subtleties.

This scripture primarily discusses the correspondence between human cultivation and the operational laws of heaven and earth, as well as the interconnected principles of governing a state and cultivating the self.

First, it explains the correspondence between celestial phenomena and cultivation: The human body resembles a microcosm that must align with the operational patterns of the Five Phases (Wood, Fire, Earth, Metal, Water) and celestial movements. The twelve months of the year correspond to the four directions, with the winter solstice point shifting across eras (located in the constellation Xu during Emperor Yao's time, Niu during the Han, Dou during the Tang, and Ji during the Song) - a phenomenon called "precession of the equinoxes." The sun shines brighter when assisted by the planets Mars and Saturn, while encountering Venus and Mercury enhances its splendor; the moon follows the yin-yang rhythm of the six yang and six yin musical pitches (ancient Chinese tonal system), completing its thirty-day cycle each month.

The text then uses state governance as a metaphor for self-cultivation: The heart resembles the ruler, while the body serves as ministers. When the heart becomes arrogant and complacent, and the body chases external distractions without discipline, it brings calamities just as lunar irregularities do. The proper movement of the Southern Pole Star (Nan Chen) symbolizes the ruler's need for impartial governance, while virtuous policies in the imperial court (Mingtang) create national harmony - mirroring how bodily Qi must harmonize for health. Cultivating the Golden Elixir (Jindan) follows the same principle: governing a state requires capable ministers and sound policies, just as self-cultivation demands rectifying the heart and establishing one's destiny.

Finally, it details practical cultivation methods: Chapter Six "Refining the Self to Establish Foundations" explains that internal cultivation requires maintaining a state of tranquil emptiness, closing sensory gates (blocking the orifices), and stabilizing vital essence (fortifying the spiritual root). When the three treasures of eyes, ears, and nose (the Three Lights) turn inward, one can warm and nurture the Golden Elixir (Zizhu) in the Dantian. This seemingly formless state becomes readily perceptible - when the inner vital energy (Huangzhong) flows unimpeded, the entire body receives nourishment.

The scripture's conclusion mentions textual corruptions during transmission, noting how even Zhu Xi's corrections of several hundred characters couldn't fully restore it, demonstrating that authentic transmission requires guidance from enlightened masters to discern truth from error.

This passage explains the essential techniques of "refining the self" (lianji) in Daoist cultivation. "Refining the self" refers to the continuous practice of self-perfection. Confucius once said that a noble person must first stabilize themselves before taking action, calm their mind before speaking, and establish trust before making requests. The reason sages can transcend ordinary existence lies in their profound understanding of these three principles.

Authentic "self-nourishment" (yangji) encompasses several aspects: Preserving Jing (essence) and Qi (vital energy) forms the foundation; maintaining inner purity when facing external circumstances is cultivation; abiding in constant stillness while remaining responsive is cultivation; and accumulating virtuous deeds is also cultivation. Practitioners must endure rigorous trials and bear humiliation—only then can they achieve sensory purification during formal practice, reaching the state where self and objects are both forgotten.

As the Great Learning states: "Illuminating luminous De (virtue), knowing others, and resting in supreme goodness"—this aligns with the principle of refining the self. Knowing where to rest brings stability; stability leads to tranquility; tranquility brings serenity; serenity enables deep contemplation; and deep contemplation yields attainment. The "emptiness-nothingness" mentioned here is not absolute void, but rather the wondrous state where primordial Qi arises from the formless.

The root of cultivation must be sought within oneself—authentic Jing and Qi are the source of life. Ordinary people are often burdened by cleverness, exhausting their Shen (spirit); genuine practitioners relinquish intellectual cunning, turn inward to observe their true nature, forget the self, stabilize their foundation through silent contemplation, and nurture their inner elixir (neidan) by withdrawing their gaze. Only then can they achieve a state of bodily transparency and radiant vitality.

"Initial rectification" marks the starting point of refining the self; "culminating refinement" is formal practice; "establishing the stem" completes the process of self-refinement; and "final sustaining" deepens the cultivation. The character "one" (yi) is pivotal—it represents both the "self" (ji) and "central earth" (wu). Understanding this character unlocks the heart-method of Wei Boyang (author of the Zhouyi Cantongqi). Confucius said, "My Dao is threaded by one"; Laozi stated, "Attaining the one, all things are complete"; Buddhism teaches "all dharmas return to one"—all emphasizing the significance of "one." Know that the "water" in "heaven generates water" arises from this "one," which is the central line of the Kan trigram. Guarding the "one" concentrates Jing and Shen; losing it disperses spiritual energy. Comprehending the truth of "one" reveals the root of cultivation.

This scripture primarily discusses how the crux of Neidan (internal alchemy) practice lies in the discipline of "self-refinement" (lianji), along with correctly comprehending the profound mystery of "the One" (yi). Here's a modern interpretation:

The highest state of cultivation is mastering the laws of cosmic operation ("the universe in one's grasp"). When one comprehends "the One" (referring to Daoism's fundamental truth), they can manifest all things within themselves. The profundity of "the One" cannot be understood without guidance from an enlightened master. Ordinary people are often blinded by superficial appearances, failing to grasp this principle. Wei Boyang (the Immortal Elder)'s alchemical method emphasizes: first, stabilizing the foundation ("securing the spiritual root"), which refers to concentrating one's Shen (spirit) through self-refinement; second, nurturing the foundation ("tending the offspring root"), which is the process of accumulating Jing (essence) and Qi (vital energy).

Only when self-refinement reaches maturity can one practice the return of the elixir (huandan). Modern practitioners neither understand the importance of self-refinement nor foolishly expect shortcuts to immortality. The Qingjing Jing (Scripture of Clarity and Stillness) states: observing inwardly to the heart, outwardly to the form, and distantly to all things ultimately reveals only "emptiness." This emptiness isn't nihilistic void but the absolute realm beyond being and non-being. In this state, the mind becomes profoundly still, where even the concept of "stillness" disappears. While ordinary people mistake this for the ultimate state, why do desires still arise upon encountering temptations? True stillness means maintaining desirelessness when facing external stimuli—this is the standard beginners should achieve. As for genuine alchemical practice, most haven't even touched the threshold.

Many today mistake constructing Zhaijiao (purification rituals), building pagodas, practicing controversial bedroom arts like the Three Peaks techniques, rigid scripture recitation, Wuwei (non-action) governance, or sacrificial prayers for Daoist cultivation. While these may be virtuous deeds, they don't constitute true cultivation. Lü Dongbin said: Before the sevenfold return of the elixir (a Neidan term), one must first refine oneself and await the proper timing. Chen Niwan remarked: Those who can't communicate through shared language aren't true companions; those whose practice remains incomplete can't achieve perfection. Zhang Boduan (Ziyang) taught: To cultivate the nine-cycle golden elixir (highest Neidan achievement), one must first refine the self and maintain heart-mind stability. These are essential teachings transmitted through generations of patriarchs.

After receiving instruction from Huangfang Gong (a Song dynasty Neidan master), the Great Void Perfected One (Taixu Zhenren) went to Mount Wuyi for cultivation. During initial self-refinement, numerous demonic obstacles arose. By firming his resolve, severing delusions, and stabilizing his Shen, he began authentic practice—demonstrating how self-refinement requires repeated contemplation. This chapter only discusses self-nurturing methods without mentioning specific alchemical terms like "golden tiger" (lead-mercury) or "cauldron-chamber" (Dantian). Mistaking the Three Lights (sun-moon-stars) directly for the yang fire and yin tally (two Neidan states) or the golden embryo (golden elixir) would be completely erroneous.

The "Chapter on Understanding the Apertures" mentions: Those of superior De (virtue) follow nature without forced seeking ("superior virtue acts through non-action, not through examination"), while those of inferior virtue practice diligently without cease ("inferior virtue acts, its function never rests"). When the upper aperture (upper Dantian) closes, it's called "being"; when the lower aperture closes, it's called "non-being"—describing different manifestations during cultivation.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) practice. The term "non-nothingness" refers to the supreme state of the Dao, within which divine spirits reside in two key energy centers (referring to vital cavities in the human body). These two centers follow the operational laws of metallic Qi (Jin Qi), resonating and cooperating with each other.

Practitioners must comprehend the principle of "knowing whiteness yet guarding blackness": white symbolizes the essence of metal, while black represents the foundation of water. Water serves as the pivot of the Dao, numerically represented as one—the origin of Yin-Yang that contains the generative mechanism (called "yellow sprout"). Among the Five Phases, metal acts as the sovereign, guiding the "river chariot" (a Neidan term for the circulation of vital energy) like the North Star. Just as lead ore appears black externally yet contains golden substance within, adepts may seem ordinary but harbor supreme treasures.

The relationship between metal generating water resembles that of mother and child: metal as water's mother hides within its offspring, while water as metal's child resides in its mother's womb. The realized state of Daoist masters is profoundly mysterious—appearing both existent and non-existent, like the fluctuating movements in deep abysses. During practice, one should guide Jing (essence) and Qi to their proper positions. In the initial gathering stage, external manifestations appear white; after refinement, they transform into vermilion (indicating different phases of alchemical transformation).

Within the Dantian (the square-inch field), essence and energy intermingle—existing prior to heaven and earth, supreme and unparalleled. Surrounding energy gates stand guard, vigilantly preventing external pathogenic intrusions. Practice requires neither forced contemplation nor laxity. When Shen (spirit) and Qi become abundant, one naturally preserves vitality; its loss leads to decline. This cultivated state perpetually accompanies life activities.

Those of superior De (virtue/power) preserve innate authentic essence through cultivation. Like youths at sixteen when genuine essence becomes complete—though ordinary people dissipate it through desires—these adepts, receiving Wuwei (non-action) methods from enlightened masters, eternally maintain their vitality. This constitutes the sage's realm of non-action.

Those of inferior De engage in restorative cultivation to compensate for losses. After sixteen, when ordinary people's desires awaken and innate essence gradually dissipates, only the wise promptly practice through deliberate methods to restore themselves. This constitutes the immortal's work of action. The superior attain all without action, while the inferior must actively cultivate to return to primordial perfection.

This scripture elucidates the essential principles of cultivating the Golden Elixir (Jindan), emphasizing the dialectical relationship between "deliberate action" (youzuo) and "non-action" (Wuwei). Practitioners must begin with active cultivation—this forms the foundation. Only when the practice matures does the seemingly inactive state reveal its true profundity. As immortal masters taught: "In the initial stages, no one perceives the cultivation; only upon entering Wuwei does its significance become apparent."

The text employs hexagrams like Qian (Heaven) and Kun (Earth), Kan (Water) and Li (Fire) to illustrate the alchemical process: Kun represents stillness and containment, harboring the primordial True One Qi (the purest life energy); Qian symbolizes focused unity, concealing the postcelestial "natural mercury" (an alchemical term for refined Jing-Qi). Both the upper and lower "gateways" must be understood and employed simultaneously, mirroring the Daode Jing's teaching: "Observe the wonder through constant non-desire; observe the gateway through constant desire."

Throughout history, sages have pointed to this pivotal secret in diverse ways: Fuxi used the Qian and Kun hexagrams; King Wen and Confucius expounded through hexagram commentaries; Laozi termed it the "Mysterious Feminine Gate"; Shakyamuni Buddha analogized it as the "Treasury of the True Dharma Eye." Yet even those of superior aptitude cannot genuinely grasp its essence without guidance from an enlightened master.

In practice, attention must be paid to harmonizing "non-being" (represented by the Ji-earth in Li hexagram, symbolizing innate nature) and "being" (the Wu-earth in Kan hexagram, representing conditioned consciousness). When innate nature governs conditioned consciousness, emotions submit to intrinsic nature. The Primordial Qi (cosmic source energy) emerges precisely from this state of sublime emptiness. The text concludes with teachings from immortal elders like Lü Dongbin (Master Yunfang), stressing this method as the core secret of the Cantong Qi (The Seal of the Unity of the Three). Since antiquity, few have penetrated its meaning unaided—a journey as arduous as "an iron man walking through the night."

This passage elucidates the core principles of Neidan (internal alchemy) practice in Daoism. It begins by revealing that the secret to immortality actually lies within each individual, hinging upon mastery of two crucial energy centers—the "Gate of Life" and "Portal of Death" (referring to vital energetic nodes within the body).

The text employs the natural phenomenon of metal generating water as a metaphor for Neidan cultivation: metal represents pure Yang Qi (primordial energy), while water symbolizes true Yin essence. Practitioners must comprehend the nature of metallic Qi (primordial energy) and grasp the principle of "knowing whiteness yet guarding blackness"—where "whiteness" signifies the untainted metallic nature, and "blackness" denotes the life-nurturing water element. When water first emerges in its pristine state, this is called the "primordial condition," known as "divine illumination" (Shenming).

The passage particularly explains the concept of "the origin containing golden sprouts": just as white gold lies concealed within black lead, the embryonic form of the elixir gestates within the "River Chariot" (a Neidan term referring to the pathways of essence-energy circulation in the body). In terms of Five Phase generation, metal (Dui trigram) generates water (Kan trigram), yet the middle line of the Kan trigram belongs to metal—hence the saying "the mother hides within the child's womb." Conversely, water (represented by the celestial stems Ren and Gui) is born from the western metal position, while the middle line of the Dui trigram contains Kan water—thus termed "the child dwells in the mother's embrace."

The state of perfected beings (Zhenren, accomplished practitioners) is profoundly mysterious, embodying the infinite transformations of the Qian (Heaven) trigram and the life-containing potential of the Kun (Earth) trigram. During practice, one gathers the silvery essence from lead (refining the body's primordial energy), much like external alchemy requires maintaining a ruddy exterior while preserving inner purity. Finally, the mention of "chaos within the square inch" subtly points to returning to the undifferentiated Taiji (Supreme Ultimate) state during cultivation, where the most authentic primordial Qi gestates within.

Before the formation of the cosmos, the primordial Qi (Xiantian zhi Qi) already existed in its supreme purity. In Neidan (internal alchemy) practice, one must establish within the body a sacred spatial structure resembling the celestial paradise of Hutian—a space evoking both walled palace towers and the mythical Penglai Isles. This inner "cauldron-vessel" (Dingqi) requires vigilant protection, much like a fortified city with defenses on all sides, lest perverse energies infiltrate. The practitioner must maintain unwavering alertness without momentary lapse, for the slightest breach in this safeguarding would nullify all accumulated progress.

The text particularly emphasizes three essential requirements for practice: First, establishing a strictly defined cultivation space and protocol (altar grounds, Tanshan); second, preserving mental clarity free from distractions; and third, balancing movement and stillness harmoniously. Only through these can one ensure the Shen (spirit) and Qi permeate the body without dissipation. The slightest negligence risks complete failure—hence genuine practitioners dare not indulge in carelessness even during rest, perpetually maintaining the Golden Cauldron (Dantian) filled with authentic Qi to harmonize the interplay of Yin-Yang energies.

The subsequent chapter "Discerning Orthodoxy from Heterodoxy" warns practitioners to distinguish authentic methods from deviant practices. Some mistakenly believe immortality can be attained through techniques like visceral introspection, ritual pacing of the stars (Bugang tadou), or obsessive calendrical calculations—only to disrupt bodily functions: causing intestinal disturbances, absorbing malign energies, and sleepless exhaustion that culminates in physical collapse and mental delirium. Others obsess over constructing altars for ceaseless ghost-deity sacrifices, even deluding themselves with dreams of spirits as proof of impending immortality, only to meet premature death. These thousand heterodox paths betray the Dao of the Yellow Emperor and Laozi; the truly discerning must recognize their peril.

The practitioner must first comprehend the fundamental principles of the Great Dao. Authentic cultivation must follow the natural laws of harmonizing Yin-Yang and balancing Kan (water) and Li (fire) - representing complementary opposites like heart and kidneys. All other methods belong to heterodox paths. For instance: visualizing internal organs, contemplating breath, performing star-stepping rituals (Tianbu), hand mudras and incantations; practicing sexual cultivation or dual-gender techniques; or methods like swordplay, daoyin exercises, and environmental Qi absorption - these all disturb the primordial Qi (Xiantian Qi) and represent the lowest form of heretical practice.

Other misguided practices include exhaling impure Qi, enduring hunger through fasting, prolonged sitting meditation without sleep, or summoning spirits through altars - these are all deviant methods that disrupt the true path. They lead to mental confusion, reversed Qi-blood flow, daytime restlessness, and nightly nightmares. Despite their variety, they ultimately prove futile. They contradict the teachings of the Yellow Emperor and Laozi, fail to grasp the true principle of Yin-Yang union transmitted by authentic masters, and ultimately invite punishment from the underworld (Jiudu). How could such methods possibly refine the Golden Elixir (Yishu zhi zhu)? Seeking longevity through them only shortens one's lifespan.

If a person of spiritual capacity encounters an enlightened master and diligently practices without cease, devoting themselves day and night to refining the Golden Elixir (Fushi) through three years of secret cultivation, they may roam freely throughout the realm. After nine years, they'll achieve weightless levitation; after twelve years, they'll become impervious to water and fire. Dwelling peacefully in mountain grottoes without worldly concerns, they'll feast at the Jade Pond (Yaochi) in eternal bliss. Upon completing their Daoist cultivation, they should accumulate virtue while awaiting the celestial summons. When the decree arrives from the Three Heavens (Santian), the Great Unity Deity (Taiyi) will summon them to join the immortal ranks in the Central Continent (Zhongzhou). Those with greater merit may ascend directly to the Three Pure Realms (Sanqing), receive immortal appointments, and obtain celestial scriptures and registers (Yinglu shoutu) - like the accomplished immortals Zhang Daoling, Ge Hong, Xu Xun (Jingyang), Fuqiugong, Zhongli Quan, and Lü Dongbin. Later students should follow these authentic cultivation methods.

In this chapter, the Immortal Elder Wei Boyang emphasizes the distinction between delusion and enlightenment, heresy and orthodoxy: following false paths leads to underworld punishment, while cultivating the true method brings complete merit and celestial ascension - this is the inevitable principle. As for specific cultivation stages, they will be explained in detail later.

(Dragon and Tiger's Two Crescents Chapter 9)

The alchemical classic "Records of Fire" (Huojì) contains no empty words - it elucidates cultivation principles through Yijing hexagrams. The Dantian (elixir field) resembles a crescent moon (Yanyue) and serves as the alchemical cauldron. The White Tiger (referring to kidney essence) provides the crucial refining heat, while the Mercury (representing the spirit) must flow freely like water.

This passage elucidates the core principle of "Dragon-Tiger Copulation" (Longhu Jiaogou) in Daoist Neidan (internal alchemy) practice. The Azure Dragon represents the Zhen trigram of the East (yang, symbolizing the Original Spirit [Yuanshen]), while the White Tiger symbolizes the Dui trigram of the West (yin, representing the Original Essence [Yuanjing]). Their union resembles the waxing moon (Dui trigram) and waning moon (Gen trigram), each contributing eight parts to form a complete sixteen liang (the ancient measurement for one jin, symbolizing wholeness).

Specifically: The Western White Tiger corresponds to the lower Dantian (Jade Pool) in the human body, representing Original Essence (mercury) and Flowing Pearl (vital essence [Jingqi]), located in the waxing moon position. The Eastern Azure Dragon corresponds to the upper Dantian (Golden Cauldron), symbolizing the Original Spirit (cinnabar), positioned in the waning moon phase. The Reclining Moon Furnace (Taiyi Divine Furnace) refers to the yin-aligned alchemical furnace, shaped like a crescent moon, resonating with the White Tiger's yin nature.

The text cites the Yijing (Book of Changes) to illustrate: though the White Tiger (Original Essence) possesses destructive potential, mastering the "treading on a tiger's tail" approach (cautious engagement) transforms peril into auspiciousness. The Azure Dragon (Original Spirit) embodies transformative creative power—when harnessed and regulated, its generative force becomes controllable.

The crux of cultivation lies in uniting the Eastern Azure Dragon (Hun, ethereal soul) with the Western White Tiger (Po, corporeal soul), akin to combining eight qian (Dui) with eight qian (Gen) to form one jin (sixteen liang), achieving yin-yang equilibrium. This fusion is termed "metal-wood convergence" (Jinmu Jiaobing), where soul and spirit become interlocked (spiritual unity). The conclusion explains ancient measurements: ten millet grains make one daogui, sixty-four grains form one gui—gradually accumulating to sixteen liang (one jin) symbolizes the perfected state, mirroring how cultivation requires progressive refinement.

Regarding weight measurements in antiquity: There exist two main interpretations. The Shuowen Jiezi records that eight zhu (ancient weight unit) make one zi, while the Jianyun states six zhu equal one zi. Some sources even claim eight liang constitute one zi, though none of these are entirely accurate. The correct conversion should be: three zi make one liang (equivalent to twenty-four zhu), sixteen liang form one jin (totaling three hundred eighty-four zhu), and four liang equal one lüe. The ancients subdivided weight units with such precision to correspond numerically with the hexagram lines in the sixty-four hexagrams of the Yijing (Book of Changes).

In the chapter "The Return of Gold to Its Nature," it is said: When genuine gold is cast into fierce flames, neither its luster nor radiance diminishes. Just as the sun and moon have maintained their brilliance unchanged since the dawn of creation, true gold never loses its essential weight. While the celestial bodies maintain constant form, gold's essence actually originates from the moon—during the new moon (shuo dan), the sun imparts its energy to the moon, causing gold to return to its lunar source. By month's end (yue hui), the gold becomes enveloped and concealed, its contours dissolving into emptiness. At this stage, gold reverts to its fundamental nature, emitting majestic light within the alchemical cauldron.

The immortal master Wei Boyang particularly emphasizes here: The "gold" mentioned earlier is no casual metaphor, but rather denotes the crucial material for alchemical practice. Without this "gold," the Golden Elixir (Jindan) cannot be forged. This elixir refers neither to mundane gold, silver, jade, nor metals refined from ordinary earth and stone, but rather to the wondrous product of heaven-earth creation and the inversion of the Five Phases (Wuxing)—a unique substance born from the grand transformations of Qian (Heaven) and Kun (Earth).

Regrettably, some misguided practitioners today become flustered upon hearing "Golden Elixir," completely misunderstanding its true meaning. They discourse emptily about cultivation while remaining ignorant of the elixir's real significance, never delving deeply into the teachings of the Cantong Qi (Triple Concordance), thus deceiving the world. How could they know the immortal master explicitly revealed the miraculous function of this "gold" in his classic? Some foolish readers, instead of investigating the nature and purpose of yin-yang's true gold, mistakenly assume it refers to metallurgical furnace work—truly lamentable!

If we don't reveal some genuine secrets to the world, I fear this classic may become increasingly neglected through the ages. When people cannot comprehend its profound meaning, they will abandon its study—how then could they ever attain the true essence of cultivation?

Those with profound spiritual roots should understand: This "gold" existed prior to the primordial chaos (Hongmeng), before the differentiation of the Supreme Ultimate (Taiji). Originally belonging to the pure yang Qian hexagram, it's called "Qian-gold." When cosmic dissolution approaches, this gold repays chaos for its grace—the first line of Qian intersects with Kun (Earth), causing this gold to rush into the Kun palace (pure yin), becoming "gold within Kun." When Kun receives this gold, its interior becomes substantial, transforming into the Kan (Water) hexagram. Kun's original three broken lines (all yin) represented "earth of Kun"; when filled with this gold, it becomes Kan. Kan's proper position lies in the northern region of Gui-water, hence Kan represents water while gold hides within water—thus called "gold within water."

This scripture discusses the significance of "Dui Metal" (symbolizing the metallic energy of the West and autumn) in alchemical practice. Daoist philosophy holds that the primordial true metal (the purest energy) cannot remain permanently in the postnatal Kan position (the northern water trigram), but transforms into Dui Metal. While Dui Metal may occasionally shift to the northern Kan position, it primarily resides in the western You position (due west), accumulating energy over time.

The key to cultivating the Golden Elixir (Jindan) lies in locating this Dui Metal energy. The true path of the Golden Elixir isn't sought in external Qian (Heaven), Kun (Earth), or Kan (Water), but through focused attunement to Dui Metal. Since Dui Metal shares its origin with the lunar Kun energy (yin principle), success comes through resonance with kindred energies. From the Yellow Emperor and Laozi to all realized adepts throughout history, mastery of Dui Metal has been the gateway to attainment. As King Wen's evolution of the Zhouyi mentions "three days before and after the Geng day," and Confucius' interpretation of the Xun and Dui trigrams states "the yielding follows the firm," both secretly reference the operational principles of Dui Metal.

Dui Metal shares its essence with the celestial moon (Taiyin), though the moon is called "Great Yin" while Dui Metal is termed "Lesser Yin." The moon reflects solar light to create day-night and seasonal cycles, while Dui Metal sustains the ceaseless regeneration of the cosmos. If worldly gold can endure as long as heaven and earth, remaining unchanged through fire refinement, how much more so this Dui Metal born from the cosmic forge of Qian and Kun?

The scripture particularly details the correspondence between lunar phases and Dui Metal's movements: On the first day of each lunar month when sun and moon conjoin, the moon first reveals its yang light (the new moon) in the Geng-Shen direction. At this celestial Taiyin's new cycle, the Dui Metal within the human body simultaneously germinates the "primordial yang elixir" from chaos - this being the terrestrial manifestation of Lesser Yin. Thus the foundation of the Golden Elixir... [text breaks off; the continuation would presumably elaborate on Dui Metal's concrete relationship with alchemical cultivation]

This scripture primarily elucidates the theory of "Golden Fluid Returning Elixir" (Jinye Huandan) in Daoist alchemy, employing lunar phases and metallurgical processes as metaphors for the alchemical transformation.

The analogy of "gold returning to its mother" refers to the Dui trigram (representing metal's dwelling), whose mother is the Kun trigram (earth). Just as the moon becomes enveloped by the sun during the moonless月末 (hui day) and begins to shine anew on the third lunar day, the alchemical gold must undergo extraction from Kun (earth), transformation through Dui (metallic state), and ultimate return to its source. The crux of alchemy lies in discerning the timing of these cyclical changes.

The text details the Five Phases' generative and restrictive principles in alchemy: the mutual regulation of water and fire requires earth's mediation ("yellow earth as gold's father, flowing pearls as water's child"), while the Vermilion Bird (southern fire) demands balanced control. When water overpowers fire, all three elements return to earth. The fusion of gold, water, and fire properties enables this return to origin.

The effects of ingesting the Golden Elixir (Jindan) are described thus: when golden cinnabar (the elixir) enters the five organs, it spreads through the body like wind and rain, restoring youthful complexion, turning white hair black, regrowing lost teeth, rejuvenating old men into vigorous youths and elderly women into maidens—ultimately achieving the "casting off mortal form" transformation into a Perfected Being (Zhenren). Particular emphasis is placed on the "awe-inspiring golden cauldron," the sacred alchemical vessel believed to possess such divine power that even sun, moon, stars, celestial dragons, and spirits revere and protect it.

Note: The "two earths" refer to Wu-earth and Ji-earth, representing yin and yang earth qualities; "ziwu" denotes water-fire polarity, while "wuji" signifies central earth. The numerical combinations (three, five, eight) symbolize the yin-yang equilibrium required in alchemical practice.

In the Eight Trigrams (Bagua) of the Book of Changes, the hour of Zi (midnight) corresponds to the Kan trigram in the true north (representing water), with its primordial number being one; the hour of Wu (noon) corresponds to the Li trigram in the true south (representing fire), with its primordial number as two. At the center of the Kan trigram resides Wu earth (yang earth), numbered five; similarly, the Li trigram contains Ji earth (yin earth), also numbered five. Wu earth guards the gateway of the Kan trigram, governing the primordial True One Qi (cosmic source energy); Ji earth stations at the gateway of the Li trigram, coalescing the postnatal True Mercury (a Neidan term referring to mental-spiritual energy).

To access the primordial True One Qi, one must regulate through Wu earth; to harness postnatal mental-spiritual energy, one must subdue Ji earth to achieve harmony. When the Qi of Zi and Wu (water and fire) harmoniously intertwine, and Wu and Ji earths cooperate, their essences miraculously fuse and crystallize. As Wu earth flows toward Ji earth, they resonate as kindred within the "cauldron" (a Neidan metaphor for the body). Their union forms a crystalline substance called the "tablet jade" (an ancient ritual object, here symbolizing the elixir foundation).

In the Bagua, the Kun trigram (representing earth) is the mother of all minerals. Without the support of Kun earth, it becomes difficult to grasp the movement patterns of the Dui trigram (representing marsh). During cultivation, one must align with the breathing rhythm of the Zi-Wu hours, allowing Wu and Ji earths to nourish each other, while lead (kidney essence, Jing) and mercury (mind-spirit, Shen) unite like husband and wife. Yellow earth refers to Wu earth, which generates the metallic nature within the Dui trigram, hence called the "father of metal." Flowing mercury (mind-spirit) belongs to the wood phase, while lead-water (kidney essence) nourishes the mercury within wood—thus mercury is termed the "child of water."

Lead-water is restrained by Wu earth. When Wu earth stabilizes the central palace (the spleen-stomach region), fluids cease reckless movement or leakage. The Vermilion Bird symbolizes the Li trigram, representing fiery mental activity. When the mind is calm and the pulse steady, it regulates the Five Phases' mutual restraint: water overcomes fire, fire overcomes metal, metal overcomes wood—until all restraining forces return to the harmonizing embrace of thick earth (Ji earth).

The so-called "three natures" refer to Wu earth, metal, and water, which gather through the Kan trigram's gateway of Wu earth. The wood nature corresponds to Ji earth. When Wu, metal, and water converge, the wood nature of Ji earth is gradually subdued and transformed, ultimately refining into the Great Elixir (Neidan).

Jusheng (sesame seeds), when consumed regularly, can prolong life—how much more potent is the Golden Elixir (Jindan), forged from metal, water, Wu, and Ji, the supreme treasure of heaven and earth. Practitioners attain longevity by storing primordial Qi ("subduing Qi") and ingesting millet-sized elixirs ("taking the pill"). Ancient texts mistakenly wrote "subduing" (伏) as "ingesting" (服), but subduing Qi means gathering primordial energy, while taking the pill means swallowing refined essence—both are indispensable. Thus, immortal masters emphasize: subduing Qi differs from ingesting Qi; the true path to longevity lies first in storing primordial energy, then in consuming the elixir.

To cultivate the Golden Elixir (Jindan) through internal alchemy (Neidan), practitioners must first harmonize the two earthly energies of Wu and Ji (representing the spleen's earth and the intentional earth, symbolizing the central balancing force in the body). The method involves circulating earth Qi through the four seasons—each season's final eighteen days are governed by earth energy, corresponding to the earthly branches Chen, Xu, Chou, and Wei. During summer, fire generates earth; when earth Qi is vigorous, it restrains metal energy. Thus, by the early autumn month of Shen (the seventh lunar month), the combined energies of water and earth flourish together.

Four directional guardian stars govern the earth: the eastern star in the Di constellation guards the Azure Dragon's domain, the western star in the Wei constellation regulates the White Tiger's power, the southern star in the Liu constellation restrains the gate of Li fire, and the northern star in the Nü constellation stabilizes the gate of Kan water. By harmonizing these earth energies, one can gather the true metal Qi from cinnabar and integrate it into the five viscera. When the Golden Elixir first takes form, its medicinal Qi spreads like mist, moistening like rain, and permeates the entire body, reaching all limbs. At this stage, the practitioner's spirit (Shen) and Qi become complete, their complexion glows, white hair turns black again, lost teeth regrow, and the aging body rejuvenates, transcending worldly ailments to achieve the sublime state where form and spirit are perfected.

Chapter Twelve explains the alchemical principle of "like attracting like." Just as lead white reverts to lead when heated, or snow melts into water when warmed, alchemy must follow nature's patterns of affinity. The Golden Elixir primarily uses cinnabar, refined with mercury—just as rice requires rice seeds and chickens hatch from eggs. Forcing incompatible materials together violates natural principles, akin to substituting fish eyes for pearls or weeds for catalpa wood—a futile endeavor.

Many Daoist practitioners, despite their extensive learning, fail because they ignore this principle. They mechanically mix minerals like chalcanthite, mica, alum, and sulfur, burn them with camphorwood, or even add five-colored copper as supplementary material. These clashing elements can never fuse, just as swallows cannot birth phoenixes, foxes cannot nurture foals, water cannot burn, nor flames moisten. Blind experimentation only wastes resources without yielding the true Golden Elixir.

This passage elucidates the core principles of cultivating the Golden Elixir (Jindan), emphasizing the necessity to follow nature's law of Yin-Yang harmony. Those who rely on their own cleverness while straying from the true path remain doubtful halfway through their journey—from youth till white-haired age—clinging to misguided ways like viewing the sky through a bamboo tube, their narrow vision unable to grasp the true direction of practice.

Through alchemical metaphors, the text illustrates how all things must return to their inherent nature: white lead powder and black lead, when refined, revert to their original forms upon encountering fire; ice and snow melt into water when meeting warmth; gold mixed with mercury turns white but regains its reddish hue when heated. Ordinary people become lost in desires, disturbing their true nature, while preserving this nature leads to longevity. Two key questions arise here: What is "gold" (referring to the essence within cinnabar)? And what is "the harmony of water and fire" (symbolizing Yin-Yang balance)?

A genuine practitioner must comprehend the laws of cosmic creation and master the transformations of Yin and Yang. To refine the Golden Elixir, one must first accumulate cinnabar (associated with the Li trigram, representing fire) and harmonize mercury (found in the "Jade Pool," i.e., the Dantian). Then, water from the Kan trigram (symbolizing water) must temper the fire of Li. Only when water and fire interact, when gold and cinnabar merge, can transformation occur—because resonance between like substances is fundamental, and the union of Yin and Yang is paramount. Just as farming requires grain seeds and hatching eggs demands eggs, attaining immortality must follow the principle of like begetting like.

Those who disregard this law, even if they meditate in seclusion for a thousand years, will achieve nothing. Falling into heretical methods—such as sexual techniques (Fangzhongshu) or absorbing Yin to supplement Yang—is akin to mistaking fish eyes for pearls or weeds for fine timber. Sparrows cannot birth phoenixes; foxes cannot bear steeds. Water cannot burn upward, nor can fire moisten downward—Yin-Yang transformations must obey nature's laws.

When the Daoist master Ziqiong Zhenren studied under Taixu Zhenren, his first question was whether The Kinship of the Three (Cantongqi) emphasized understanding the Book of Changes (Yijing) or actual cultivation. Taixu Zhenren replied: "The Yijing speaks of nothing but the two matters of Yin and Yang. To comprehend them and put them into practice is the way of sages." Thus, the Yijing states, "In the southwest, gaining companions means walking with one's kind," and the Cantongqi similarly declares, "Like attracts like." First grasping the principle, then applying it—this is the path of the sages. Sadly, later generations, relying on their own intelligence without seeking enlightened teachers, misinterpret ancient texts at will. Some attempt to refine gold with Shaozhou’s stone gall, others smelt elixirs with Chenzhou’s silver sand—all missing the true essence.

This passage addresses two main themes: first, it critiques the misguided practice of blindly consuming elixirs, and second, it highlights the profound contributions of the Three Sages (Fu Xi, King Wen, and Confucius) in creating the foundational classics.

The text begins with a cautionary tale: Minister Zhang of Jiujiang was obsessed with alchemy (Waidan), believing that ingesting elixirs would enable him to ascend as an immortal. Lü Dongbin (one of the Eight Immortals), seeing his earnest yet misguided pursuit of the Dao, disguised himself as an alchemist to enlighten him. However, Minister Zhang arrogantly dismissed him. Lü Dongbin left behind a warning poem before departing, pointing out that true elixirs are formless and intangible, and that consuming minerals and metals is sheer folly. Eventually, Minister Zhang went blind and died. Such individuals stubbornly cling to their misconceptions, mistaking physical substances for materials of cultivation. They exhaust their wealth refining and consuming these substances, only to harm themselves. Like viewing the sky through a bamboo tube, they fail to grasp that genuine Daoist immortals truly exist in this world.

The passage then turns to the achievements of the Three Sages in establishing the classics: the greatest among them was Fu Xi, who observed heaven and earth to create the Bagua (Eight Trigrams). King Wen of Zhou expanded upon this, developing the sixty-four hexagrams and composing the hexagram statements. Confucius (referred to as "the foremost among later sages") further elucidated these with the Ten Wings. These three sages arose in succession, each contributing uniquely yet equally to this sacred legacy. The classics they established became enduring standards for later generations. Their wisdom did not emerge arbitrarily but was attained through lineage and enlightenment—like lifting a curtain to ascend a height, where the view suddenly becomes clear. The essential principles in texts like the Fire Record and six hundred other alchemical scriptures (Neidan) share the same core truths, yet regrettably, people seldom ponder their underlying principles deeply.

The author concludes by noting that these truths should not be carelessly written down—both out of concern for revealing celestial secrets and for fear of the Daoist tradition being severed. Thus, only an outline can be presented here, as the specific methods of practice cannot be fully disclosed. It is akin to crafting pottery, which requires following precise techniques.

This passage primarily discusses how ancient sages transmitted and annotated the Book of Changes (Yijing), while criticizing later scholars for arbitrarily altering the classical text.

The text first mentions two great sages, the Yellow Emperor (Huangdi) and Laozi, emphasizing the importance of respecting the teachings of past sages. The author criticizes later scholars for their ignorant and presumptuous behavior in casually disparaging the ancients, considering such actions deeply sinful.

It then elaborates on the transmission system of the Yijing:

• Fuxi (also known as Paoxi or Fuxi) first observed the patterns of heaven and earth and created the Eight Trigrams (Bagua).
• King Wen of Zhou developed the system of hexagrams and lines.
• The Duke of Zhou composed the line statements (Yao Ci), forming the main body of the Yijing.
• Later, Confucius added ten supplementary commentaries known as the Ten Wings (Shi Yi), including the Upper and Lower Tuan Zhuan, Great and Small Xiang Zhuan, etc. These were meant to aid in understanding the Yijing, not to directly interpret it.

The text sharply criticizes scholars like Fei Zhi, Zheng Kangcheng, and Wang Bi for arbitrarily modifying the classic:

• Fei Zhi split the Tuan Zhuan and placed it under each hexagram.
• Zheng Kangcheng moved the Wenyan Zhuan to follow the Qian and Kun hexagrams.
• Wang Bi relocated the Xiang Zhuan beneath the line statements and added phrases like "Xiang Yue" and "Tuan Yue."

The author argues that these alterations corrupted the original form of the classic, resulting in the circulated Yijing no longer being the authentic Zhouyi but rather Wang Bi’s modified version. The passage concludes by noting that some earlier scholars sought to restore the Zhouyi to its original state.

This text reflects the Daoist tradition of respecting the original form of scriptures and opposing arbitrary modifications, as well as the rigorous attitude of ancient scholars toward classical transmission.

This passage primarily examines the textual transmission and variant editions of the Zhouyi (Book of Changes). Song dynasty scholars like Li Tao, Chao Yuezhi, and Ouyang Xiu all conducted collations of the Zhouyi. Li Tao observed that the original twelve-chapter sequence of the Zhouyi became disordered during the Eastern Han period with scholars Fei Zhi and Zheng Xuan, and was completely rearranged by Wang Bi. Li re-collated it under the title "Ancient Yi" and had it carved on printing blocks at the prefectural school. Chao Yuezhi conducted further revisions, arguing that only two chapters constituted the core classic, while two chapters from the "Ten Wings" (the ten commentaries explaining the Zhouyi)—specifically the Shuogua—were already missing.

Ouyang Xiu noted that when the First Emperor of Qin burned books, the Zhouyi survived because it was used for divination, but the "Ten Wings" had already scattered among the populace. During Emperor Wen of Han's reign when texts were collected, only four commentaries—Tuan, Xiang, Xici, and Wenyan—were recovered. By Emperor Xuan's time, a woman by the Yellow River discovered a complete Zhouyi in an ancient tomb, though the middle and lower sections of Shuogua were too damaged to decipher. Later scholars erroneously supplemented the ten commentaries with Xu Gua and Za Gua, as these two chapters' simplistic language didn't match the original intent.

Cheng Yi (Master Cheng) uniquely perceived that Xu Gua didn't represent the Zhouyi's true meaning, while Zhang Zai (Hengqu)'s defense of it was incorrect. Zhu Zhen argued that only the Qian hexagram preserved the Zhouyi's original form, which Wang Bi dared not alter. Zhu Xi maintained that the Zhouyi originally comprised two chapters of core text (with hexagrams drawn by Fuxi and judgments by King Wen and the Duke of Zhou) plus ten commentaries by Confucius—twelve chapters total—but later Confucians disrupted this arrangement. Zhu reorganized it into two volumes of core text and ten of commentaries, attempting to restore Confucius's original version.

The passage concludes by emphasizing the "Ten Wings"' critical role: without these commentaries, the Zhouyi's principles remain obscure, its language incoherent, its transformations incomprehensible, and its practical applications (including alchemical vessels) unusable. Only through mastering these can one grasp yin-yang transformations, alchemical timing, and auspicious/inauspicious dynamics. The "four ways of the sage" mentioned in the "Ten Wings" refer precisely to these dimensions. When noble individuals (junzi) contemplate action, they may seek divinatory guidance—no matter how profound or obscure the matter—to foresee future outcomes.

This passage elucidates the essential principles of cultivating the Dao (道) and seeking truth. True gentlemen of cultivation invariably operate within that mysterious realm between existence and non-existence, where their practice enables prescience of future events. Without possessing the most profound wisdom in the world, who could attain such a state? The author states that the "Ten Wings" (commentaries on the Yi Jing) have already thoroughly explained this principle.

Though the cultivation methods of ancient sages have been transmitted to later generations, the concern remains that seekers may lack sufficient virtue and wisdom to receive these authentic teachings. Various obstacles create barriers, leaving many without the karmic affinity to encounter the true methods. The three sages Fuxi, King Wen, and Confucius successively emerged to deduce the patterns of heaven and earth, establishing teachings for myriad generations. Although the supreme Dao naturally finds its sages to illuminate it, personal realization must rely on guidance from enlightened teachers. Even with innate intelligence, self-directed study inevitably encounters obstacles.

When sincere Dao-seekers devote themselves to study and suddenly grasp their teacher's true meaning, enlightenment dawns like lifting a curtain to reveal a clear view indoors, or like ascending a high tower in darkness to see everything distinctly. How could people awaken without seeking instruction from teachers? To find a genuine teacher, one must first verify them through the "Cantong Qi" (参同契). Only when a teacher can explain every sentence and penetrate every chapter of this text can they be considered authentic. If any single phrase remains unclear, they cannot be trusted.

Some claim alternative paths to attainment exist beyond studying this text, but such assertions are deceptive. Why? Because the "Cantong Qi" transmits the Dao of Fuxi as expounded by King Wen, the Duke of Zhou, and Confucius. The author asserts that even after ten thousand generations, none surpass sages like Confucius. The Yellow Emperor's "Yin Fu Jing" (阴符经) in three hundred characters, Laozi's "Dao De Jing" (道德经) in five thousand words - all share the same principles as the "Cantong Qi." Patriarchs through history like Zhang Daoling (张道陵), Ge Xuan (葛玄), Xu Xun (许逊), and Master Fuqiu all entered the Dao through this gateway. Later alchemical classics like "Wuzhen Pian" (悟真篇) and "Jindan Dayao" (金丹大要) all originate from the "Cantong Qi." Even Buddhist scriptures align with these principles.

Those who boast famous teachers yet cannot explain the "Cantong Qi" mislead their disciples. Their claim that the Dao exists beyond words is sheer falsehood. Only through thoroughly comprehending this text can genuine cultivation begin. Its six hundred character formula on fire phases (火候), the mysteries of seasonal nodes and hexagram lines - every passage contains solemn admonitions. Without careful contemplation tracing these to their source, how can one fathom such profound truths?

This text was meant for those with karmic affinity - how could it be casually transmitted? If all remained silent, how would the Great Dao be transmitted? Yet writing everything down risks revealing celestial secrets. The author wrestles with this dilemma, sighing hesitantly like the legendary suspicious beast.

The passage discusses the crucial steps and precautions in refining the Golden Elixir (Jindan). The immortal author describes his own wavering state of mind during cultivation and explains that this text serves as a guideline for future practitioners, though only the general framework can be revealed—not the complete secret methods.

Regarding the elixir refinement process: Metal (from the Western Dui position in the Bagua) is used as a barrier to prevent water's encroachment, requiring precise control of the metal-water ratio (15 parts metal to 15 parts water). Measurements must be exact in the alchemical furnace, with water slightly exceeding the amount. The true Golden Elixir must retain the purity of primal gold, where three elements (metal, water, and fire) intermingle and transform. Under furnace fire, they first liquefy then solidify into yellow pills. Improper handling will render the elixir ineffective or even harmful to the body.

Strict protocols govern the process: After grinding and mixing ingredients, they are placed in a crimson furnace and hermetically sealed. The fire must burn continuously—gentle flames at first, intensifying to fierce flames at the end. Temperature must be carefully monitored throughout twelve seasonal cycles. When the elixir turns purple, the miraculous Golden Elixir is complete; just a minuscule portion (the size of a knife-handle's tip) holds extraordinary potency.

The author emphasizes this chapter contains the true essence of elixir refinement. Those with wisdom will discern its principles, but many—lacking proper guidance—mistake it for ordinary metallurgy, laboring in vain before blaming earlier masters. The key revelation here: Practitioners must understand this "metal" refers to the authentic gold of the Western Dui position (one of the Eight Trigrams). It demands sincere devotion to seek, requires altar rituals for protection, and necessitates awaiting the moment when "metal generates water"—with the resulting water also requiring meticulous handling.

This passage discusses the discernment and application of "water" in alchemical practice. First, one must distinguish whether using pre-natal water (a cultivation term referring to the true water transformed from the body's innate primordial Qi) or post-natal water (ordinary water). Turbid post-natal water cannot be used to refine the Returning Elixir (a high-level alchemical substance in Daoist practice).

The author employs the metaphor of the clear Jing River and muddy Wei River to illustrate that alchemy requires maintaining water's purity undisturbed, just as one would wait for the Jing waters to clarify. Such clear water contains true gold (referring to the innate true Yang energy within water), echoing the ancient saying "gold is born from beautiful waters" (from the Thousand Character Classic) - only the clearest water can generate gold.

Regarding measurement, the text establishes that gold (representing the true Yang Qi required for alchemy) should weigh approximately fifteen liang (in ancient measurement, sixteen liang made one jin). Only this weight of gold can produce suitable beautiful water. The gold-water ratio must be precise: if fifteen liang of gold generates five fen (five portions) of water, it becomes excessive and unusable; producing two fen (two portions) of water creates the optimal ratio, while three fen remains unsuitable.

When the gold-water ratio reaches perfection (fifteen liang gold to two fen water), one must immediately apply two fen of fire regulation (mind-intent control during cultivation). When gold, water, and fire harmonize - with fire receiving gold's Qi while being restrained by water - they coalesce into the Returning Elixir through marvelous transformation. This constitutes the most crucial alchemical operation.

The subsequent passage reveals how sages (accomplished practitioners) master temporal rhythms: selecting appropriate months from the year to position gold (harvesting true Yang), observing days within months with tidal precision, choosing hours within days corresponding to hexagram lines (changes in the Zhouyi's trigrams), and determining fire regulation within hours to execute fu talismans (applying incantations or fire control). Ancient sages considered golden elixir refinement their paramount task, inventing the "clustering method" to condense time: compressing a year's seventy-two hou (ancient solar terms) into a single day, concentrating the 360 hexagram lines into one month, and distributing thirty-six fu across twelve double-hours, making each shichen (two-hour period) contain six hou.

This passage elucidates the crucial techniques of "fire timing" (the mindful regulation of intention during practice) in Daoist Neidan (internal alchemy) cultivation. The alchemical process requires only two shichen (approximately four hours) of regulated fire timing—far swifter than conventional cultivation methods. What the Yellow Emperor termed the "hidden talisman" (the esoteric principles of practice) precisely refers to this accelerated method of energy condensation.

Within an extremely brief period (about one ke, or fifteen minutes), practitioners can gather the pure Yang-Qi (three thousand six hundred authentic energies) from heaven and earth, reversing its flow into the Dantian (energy center). This fleeting moment seizes the creative transformations of the cosmos, absorbing the essence of sun and moon. At this juncture, the body's dual energies of Yin-Yang (symbolized as dragon and tiger) intertwine: metal (lung Qi) and water (kidney Jing) merge, while tortoise (Yin) and snake (Yang) coil within the Dantian, as the celestial energies of sun and moon (crow and hare) circulate through the Governing and Conception vessels.

Key considerations in practice: The initial refinement of metal-water Qi requires prolonged accumulation (measured in years), yet the final elixir fusion occurs in an instant. Prolonging this stage damages the elixir's spiritual potency, while the slightest error may shorten one's lifespan. Though alchemy aims to prolong life, improper execution brings harm.

The text emphasizes several vital points: "dust before a bright window" metaphorically describes the elixir's exquisite subtlety; "pounding and refining" signifies the fusion of Yin-Yang energies; the "vermilion gate" denotes the Baihui point (Heaven's portal) at the crown where the elixir returns to the "chamber of Shen (spirit)"; "securing blockages" refers to breath retention; all "nine orifices" must remain sealed to prevent energy leakage.

During cultivation, the Dantian's fire must burn steadily, day and night. When the initially condensed elixir receives impetus from the heart's fire (Li-fire), it circulates throughout the body—here, utmost focus on inner stillness and even breathing allows gradual elixir congealing. Gentle fire (civil fire) dominates early stages, while strong fire (martial fire) bookends the process, as the Cauldron Verses state: "Martial at head and tail, civil in between"—the cardinal rule of fire regulation.

This passage primarily discusses the need for meticulous care in cultivating Neidan (internal alchemy, the Daoist practice of refining Jing, Qi, and Shen). The text states that "without complete mastery of the practice, one cannot achieve perfection," meaning insufficient cultivation will fail to bring about the consummate state. Practitioners must regulate the "firing times" (referring to the control of intention and breathing during practice) with the same precision as adjusting temperature. The renowned Song dynasty Daoist Zhang Boduan (known as Patriarch Ziyang) taught that these firing times must be regulated according to the transformations of Yin and Yang.

The cultivation process follows the cyclical progression of the twelve two-hour periods (the ancient division of a day). It continues until the "lead" (symbolizing primordial Qi) and "mercury" (symbolizing postnatal vital essence) are exhausted. At this stage, the seven corporeal souls (associated with negative emotions in Daoist thought) dissipate, while the three ethereal souls (representing higher spiritual aspects) undergo transformation. When primordial Qi is fully depleted, life approaches its end. Upon reaching this state, the internal elixir radiates a violet-golden light.

The text particularly emphasizes that the most miraculous elixir (the cultivated Neidan) is as fine as dust and as light as a daogui (an ancient minuscule measurement unit). Though tiny, it contains extraordinary power. These subtle yet crucial aspects of practice must be transmitted orally from master to disciple—they cannot be grasped through texts alone.

Later, the passage mentions Zhu Xi (referred to as Master Wen), the great Confucian scholar of the Song dynasty. Despite his vast learning, he never fully comprehended the true meaning of the Zhouyi Cantongqi (a pivotal Daoist scripture) due to lacking authentic transmission. In his later years, Zhu Xi admitted that although he had studied the text repeatedly, the absence of proper guidance left him unable to grasp its essence. The author uses this example to illustrate that even sages like Confucius and Mencius would struggle to understand alchemical principles without genuine instruction, criticizing those who presumptuously speculate about cultivation methods.

The final section, "Chapter on the Natures of Water and Fire," points out that the workings of the Five Phases (Wood, Fire, Earth, Metal, Water) are not inherently complex. Just as water extinguishes fire and dims light, or as the sun and moon mutually influence each other to produce changes, cultivation must align with these natural principles. The entire passage underscores that practice must follow the laws of nature and requires transmission from an enlightened master.

This scripture elucidates the operational principles of Yin-Yang and the Five Phases (Wuxing) in alchemical practice. The waxing and waning of the moon always occurs between the new moon (shuori) and full moon (wangri), because when water Qi (represented by the Kan trigram) flourishes, it erodes Yang energy, while diminished fire Qi (represented by the Li trigram) causes daylight to dim. The mutual waxing and waning yet reciprocal nourishment between these two energies constitutes the natural Dao.

The Five Phases—Metal, Wood, Water, Fire, and Earth—can be distilled into the mystical numerical formula "Three-Five-One" (referring to the core secret of alchemy). When refining the Golden Elixir (Jindan), lead, mercury, silver, cinnabar, and earth represent the Five Phases, cultivated through the harmonious pairing of Yin and Yang. Just as water extinguishes fire through the principle of Yin subduing Yang, solar and lunar eclipses invariably occur during new and full moons when these opposing forces shift. When Yin and Yang harmonize and generate each other, a natural cycle of mutual resonance is achieved.

Metal and Water belong to the realm of "emotion" (qing), while Wood and Fire pertain to "innate nature" (xing). Emotion resides in the northwest direction, and innate nature governs the southeast. The southeast represents "self," while the northwest signifies "the other." The emotion of Metal-Water comes from without to restrain Wood-Fire, while the nature of Wood-Fire condenses inward to form the Golden Elixir. This is the profound meaning behind "Metal returns to innate nature" (jin lai gui xing)—only by comprehending this principle can one truly refine the Reverted Elixir (Huandan).

The author, Wei Boyang, humbly states that he does not dare to speak presumptuously but merely emulates the literary style of ancient sages. Drawing from classical texts like the Scripture of the Dragon and Tiger (Longhu Jing) and following the methods of the Yellow Emperor's refinement of "Golden Radiance" (Jinhua), the King of Huainan's preparation of "Autumn Stone" (Qiushi), and Master Yuyang's creation of "Yellow Sprout" (Huangya), he achieved success in cultivation and thus composed the Zhouyi Cantong Qi to transmit this knowledge to later generations. These differently named elixirs are all products of the same "primordial unified Qi" (xian tian yi qi), all refined through substances of corresponding Yin-Yang natures. Later generations mistakenly took "Golden Radiance" to mean literal metal, "Yellow Sprout" to mean minerals, and "Autumn Stone" to mean urine—completely misunderstanding the expedient terminology used by ancient sages. True alchemical cultivation can never transcend the principle of Yin-Yang union to seek alternative paths.

Throughout history, the cultivation practices of sages across the Three Teachings (Confucianism, Buddhism, and Daoism) have always adhered to the law that "Yin and Yang seek their own kind." This is the true meaning behind "the Dao throughout the ages is one" (gu jin dao you yi). Students should diligently contemplate this essential point—the scripture's core teaching has already been made abundantly clear.

The Cantongqi (Kinship of the Three) clearly states that beyond the cultivation methods it records, there exists no other path to attain the Dao. Later seekers should diligently study it under enlightened teachers, and they will discover this scripture reveals the truth without reservation—it is by no means deceitful discourse.

Master Shangyang (the commentator) explains: The Cantongqi is divided into three chapters, each containing pure and undiluted content with profoundly marvelous efficacy. "Can" refers to comprehending the laws of cosmic creation, "tong" signifies utilizing the generative power of analogous substances (referring to alchemical ingredients), and "qi" denotes harmonizing with the creative functions of nature. The first chapter expounds the fundamental principles of alchemy, the middle details concrete operational methods, and the final supplements omitted cultivation techniques.

The first chapter resonates with the Dragon-Tiger Upper Scripture. Some speculate the Dragon-Tiger Scripture might be a later compilation based on Cantongqi's first chapter. Yet being termed "Upper Scripture" suggests there should logically be middle and lower scriptures. The sage's profound intent eludes ordinary understanding—"Upper Scripture" actually signifies the primary classic, truly beyond complete comprehension by average minds. Moreover, the text explicitly mentions "ancient records titled Dragon-Tiger," confirming its transmission from high antiquity.

Perfected Peng Xiao states in his preface: Immortal Elder Wei Boyang (author of Cantongqi), having received authentic transmission of the ancient Dragon-Tiger Scripture and grasped its mysteries, composed the three chapters of Cantongqi by cross-referencing the Zhouyi (Book of Changes). Later, feeling certain subtleties remained unclarified, he supplemented omissions to further unveil alchemical secrets. The immortal elder first received transmission from Perfected Yin Changsheng, then studied under Master Xu Congshi, thereby fully mastering the arcane truths of alchemy.

Among numerous commentaries on this classic, those by Peng Xiao and Wang Dao stand preeminent. Though Peng received true transmission, his annotations remain somewhat fragmented. Wang's explanations prove more concise and systematic. While the Dragon-Tiger Scripture predates Cantongqi, its presentation lacks comparable clarity. The profound and subtle cultivation formulas—such as the pivotal axiom "When metal returns to nature's origin, it may be called the Reverted Elixir"—cannot be rashly speculated upon without oral transmission from an enlightened teacher. As the text immediately cautions: "I dare not speak falsely, but emulate the sage's writings." This reveals ancient sages only dared compose texts after receiving genuine transmission—how could such classics emerge without proper lineage?

This passage discusses the significance of the Cantongqi (参同契, The Seal of the Unity of the Three) scripture. The author states that without this text, practitioners would stray into heretical paths, misled by the ignorant and fall into spiritual ruin. This scripture forms the foundation of cultivation and the Dao of sages, serving as an essential ladder to heaven and a raft to cross rivers.

Commentary on classics requires genuine understanding of their original meaning—one must comprehend them more thoroughly than previous scholars and provide clearer annotations than the source text. Otherwise, unclear explanations here and obscure interpretations there would only mislead future generations. The Cantongqi is particularly unique, having been written by Wei Boyang (a central Daoist figure) after personally studying with Yin Changsheng and Xu Zhenren (two accomplished adepts). Every character is meticulously crafted. Though Wei Boyang used concise phrases like "metal returning to nature" to summarize the Golden Elixir (Jindan) cultivation methods and the mysteries of cauldron-vessel (炼丹器具) usage, he fully captured their essence.

Some Confucian scholars of the Song Dynasty failed to grasp its profound meaning, treating the Zhouyi (周易, Book of Changes) merely as a divination manual. In doing so, they obscured the original intent of the four sages—Fuxi, King Wen, the Duke of Zhou, and Confucius—misunderstood the principles of cosmic creation, and misrepresented Wei Boyang's profound efforts. Without revealing these mysteries to some degree, the true meaning of the four sages would remain forever obscured, and the genuine essence of the Yijing (易经, Classic of Changes) would never be clarified.

Chapter sixteen explains the principles of Yin-Yang and vital essences (精气, Jing-Qi): Qian (Heaven) and Kun (Earth), strength and softness mutually complement and contain one another. Yang Qi (阳气) leads while Yin Qi (阴气) follows, like the pairing of male and female. The trigrams Kan (Water) and Li (Fire) are most crucial—though profoundly subtle, the sages established their foundational principles through observation and deduction. The Four Symbols (少阳, 太阳, 少阴, 太阴) blend in primordial chaos, ultimately returning to emptiness. The sixty hexagrams cycle in orderly motion, like a dragon-horse drawing a chariot or a wise ruler seizing the proper moment.

This passage elucidates the core principles of cultivating the Golden Elixir (Jindan), primarily revolving around the concepts of Yin-Yang, Qian-Kun (Heaven-Earth), and firmness-pliancy.

The text first establishes that cultivating the Golden Elixir resembles governing a nation—only by following the upright path (Dao) can one achieve stability, while deviant paths are fraught with peril. The previous fifteen chapters outlined the fundamental stages of alchemical practice; here we delve into their subtle intricacies. The Ninefold Revolving Elixir (Jiuzhuan Huandan)—the highest form of Daoist alchemy—requires profound understanding from practitioners, as the slightest error leads to failure.

The master Shangyangzi divided this section into fifteen chapters specifically discussing the relationship between Yin-Yang and the vital essences (Jing-Qi). Qian (Heaven, Yang) embodies firmness and rectitude, while Kun (Earth, Yin) represents pliancy and steadfastness. As Confucius noted in the Yijing (Book of Changes), only through the union of Yin and Yang can the profound mysteries of Heaven and Earth manifest. Noble individuals (junzi) can cultivate according to this principle, whereas petty persons (xiaoren) cannot.

True firmness does not mean superficial toughness (like the historical figure Shen Cheng), but rather maintaining the centered purity exemplified by the Qian hexagram. Qian represents initiative and directness, making it easily comprehensible; Kun embodies receptivity and openness, making it naturally followable. Understanding and practicing this principle enables the achievement of sagehood. The crux of Golden Elixir cultivation lies in balancing firmness and pliancy.

The Yang nature of Qian governs and gives, while the Yin nature of Kun receives and contains. Just as the pairing of male and female requires vital essences (Jing-Qi), the movement of these essences also demands Yin-Yang coordination. The Yijing states that Jing-Qi transforms to generate all things—moving forward, they create humans and myriad beings; moving backward through cultivation, they achieve immortality and Buddhahood.

The Kan (Water) and Li (Fire) hexagrams hold primary positions within Yin-Yang dynamics. When firm Qian and pliant Kun interact, Qian's solid center becomes hollow, forming the Li (Fire) hexagram, while Kun's hollow center becomes solid, forming the Kan (Water) hexagram. The sun within Li and the moon within Kan shine downward—these mysterious transformations defy description and can only be truly comprehended by sages.

(Note: The term "Qi" (炁) refers to prenatal energy in Daoist terminology, distinct from postnatal "qi" (气); "Ninefold Revolving Elixir" denotes the supreme alchemical medicine refined through nine cycles of sublimation; "Kan-Li" are two Yijing hexagrams symbolizing kidney-water and heart-fire in alchemical practice.)

This scripture primarily expounds on the principles of harmonizing Yin-Yang and governing the state while cultivating the self. The opening reference to "the four in chaos" points to the four fundamental energies: Yin, Yang, Jing (essence), and Qi (primordial vital energy), all contained within the mysterious cavity of emptiness. Like the cyclical transformations of the sixty-four hexagrams in the Zhouyi (Book of Changes), where Kun (Earth) symbolizes an ox cart and Qian (Heaven) represents dragon-horses—when Heaven and Earth unite and these celestial steeds run in tandem, the world achieves peace, mirroring how enlightened rulers govern in accordance with cosmic timing.

Here, the alchemical process of "Golden Elixir Reversion" (Jinye Huandan, the highest attainment in Daoist Neidan practice) serves as a metaphor for statecraft. The Azure Dragon of the East represents Wood-phase mercury (alchemical quicksilver), while the Vermilion Bird of the South symbolizes cinnabar fire (an alchemical ingredient). When harmonized by the White Tiger's Metal Qi from the West and the Black Tortoise's Water Qi from the North, they coalesce into form. Just as rulers must govern with rectitude—deviation or employing treacherous ministers leads to national peril—the text cites historical warnings: Li Linfu's persecution of virtuous officials triggered the An Lushan Rebellion in Tang dynasty, while Qin Hui's execution of Yue Fei caused irreversible territorial losses in Song dynasty.

Governors must understand: noble persons should tolerate petty men, while petty men ought to submit to nobility—only thus can a state stabilize. Neidan cultivation follows the same principle, taking harmony as its root. When heart-mind (Xin) remains peaceful, all affairs proceed smoothly, yet practitioners must maintain eternal vigilance—the slightest misstep undoes all progress. As the Dui (Lake) hexagram in Zhouyi states: "Harmony brings auspicious joy," leaving no room for doubt in action.

The second section, "Chapter on the Noble Person Dwelling in Stillness," elaborates further: even when secluded in inner chambers, if one's speech aligns with the Dao, resonance will come from a thousand miles away. Like an emperor issuing decrees from deep palaces, one must accord with Yin-Yang seasonal nodes and select timings through hexagram correlations—for instance, Zhun (Difficulty) hexagram suits the hours of Zi and Shen, while Meng (Youthful Folly) aligns with Yin and Xu. Each of the sixty hexagrams has its corresponding temporal window. Establishing laws requires both benevolence and virtue—those defying cosmic timing meet misfortune, while conformers find fortune. Cultivators must strictly observe calendrical cycles, maintaining sincere focus to precisely apprehend temporal transitions.

Throughout, the dual metaphors of governance and alchemy underscore the paramount importance of "harmonizing Yin-Yang"—whether in statecraft or self-cultivation, one must maintain this equilibrium, comply with celestial timing, and harbor utmost sincerity. The slightest deviation invites failure.

This scripture primarily discusses the behavioral norms and timing considerations essential for cultivating Neidan (internal alchemy, a Daoist practice).

It begins with natural metaphors: anomalies like the solstices shifting out of season, extreme heat in winter, or frost in midsummer all stem from imbalances in Yin-Yang. Just as celestial irregularities bring calamities, improper conduct during cultivation invites misfortune. Peace or chaos, fortune or disaster—all originate from a single thought in the human mind.

Next, it emphasizes aligning with natural rhythms: movement and stillness must follow the proper measures, and seasonal transitions should harmonize with one’s Qi (vital energy). Hard and soft must remain distinct, not muddled, and the Five Phases (Wood, Fire, Earth, Metal, Water) must each maintain their rightful positions. As the Yijing (Book of Changes) teaches, transformation follows patterns of expansion and contraction, cycling endlessly.

The text then highlights the critical role of speech and action: genuine Dao cultivators must be cautious in words and deeds, for language can stir heaven and earth. Yet total silence is also impractical, as it would prevent transmitting essential teachings. Just as an emperor’s decrees from the palace must accord with Yin-Yang’s seasonal shifts, a practitioner’s "herb-gathering" (collecting internal Qi) must seize the correct moment—such as during "the return of the first Yang" (the initial resurgence of Yang energy) or "the third day’s crescent moon" (a specific lunar phase), pivotal junctures for cultivation.

The scripture cites multiple Daoist masters: Master Shangyang states that while the Dao is ineffable, words are necessary to illuminate it; Laozi observes that those who truly understand the Dao do not speak recklessly, while empty talkers reveal ignorance; Master Ziyang warns of enduring torture rather than carelessly divulging secrets; and Master Niwan notes that without shared language, forging spiritual bonds becomes difficult, and without sufficient effort, fulfillment remains elusive. Together, these teachings underscore the balance between guarded speech and the timely transmission of true methods.

This passage discusses the crucial importance of timing selection in alchemical practice and the principle that sincerity manifests spiritual efficacy. The text references the Zhun hexagram (symbolizing water) and Meng hexagram (symbolizing fire) from the Yijing, each corresponding to specific celestial hours (Zi-Shen hours and Yin-Xu hours respectively), just as the sixty hexagrams have their designated days. The author Wei Boyang (Immortal Elder) humbly admits he hasn't fully comprehended these mysteries, as the true essence requires oral transmission from master to disciple.

The scripture emphasizes that without sage-like qualities, one can hardly grasp and practice these alchemical methods authentically. Internal alchemy (Neidan) requires establishing regulations ("setting principles and boundaries") to prevent deception, while maintaining benevolent virtue ("applying humane De") to preserve joyful mental states. Violating these principles invites misfortune, whereas adherence brings auspicious results. Practical operations demand strict compliance with protocols - only specific months, days, and moments prove effective annually - along with meticulous observation of the medicinal substances (water generated from Dui-metal), including their clarity and proportions. The slightest error causes failure, potentially triggering abnormal phenomena like winter heatwaves or summer frosts.

These anomalies, the text explains, stem solely from practitioners' inadequate cultivation. Foolish practitioners blame the alchemical scriptures rather than examining their own shortcomings, while those with wisdom engage in self-reflection and redouble their sincere efforts. Just as a filial son's sincerity moves heaven, the practitioner's genuine devotion naturally attracts divine assistance. Speech expresses the heart-mind - sincere words resonate with one's essential nature. Though words issue from one's mouth, their influence spreads afar, bringing fortune or calamity. Success or failure ultimately depends on human intention; when actions align with cosmic patterns, they harmonize with seasonal qi fluctuations, balance the Five Phases (Wood, Fire, Earth, Metal, Water), and accord with the cyclical principles of the Zhouyi.

The conclusion urges practitioners to maintain single-minded concentration, constant vigilance against dangers, and scrupulous conduct. Through celestial anomaly metaphors, this passage underscores how alchemical practice demands absolute sincerity, focused will, and strict adherence to established norms.

This passage elucidates the essential principles for cultivating the Golden Elixir (Jindan) path, emphasizing alignment with celestial patterns and sincere spiritual resonance. Practitioners must emulate the "Tongren" hexagram from the Book of Changes (Yijing), which symbolizes collective harmony through one yin line responding to five yang lines. When yin predominates, yang takes the lead; when yang prevails, yin governs—thus shared benefit sustains unity, while speech requires prudent subtlety. The alchemical path is profoundly subtle, demanding reverent adherence.

Chapter 18, "Lunar Conjunction and Talismanic Harmony," employs moon phases as metaphors for alchemical timing: during the moon's dark conjunction (end and beginning of the lunar month), yin and yang energies merge indistinctly, like the union of female and male principles. At this moment, vital essence (Jing) flows nourishingly, and heaven-earth's mysterious transformations become unfathomable. Practitioners must seize this opportunity, initiating circulation from the northeast (where the Ji and Dou constellations reside) and turning rightward, mirroring the moon's gradual illumination.

The text parallels the alchemical process with the six lines of the Yijing's Qian (Heaven) hexagram: the initial yang line ("Hidden Dragon") represents nascent yang energy; the second ("Dragon Appearing") signifies yin-yang harmony; the third ("Evening Vigil") warns of caution; the fourth ("Leaping Ambition") denotes timely advance or retreat; the fifth ("Soaring Dragon") marks the culmination; and the top ("Overreaching Dragon") admonishes against excess. Ultimately, yin and yang cycle endlessly, like the revolving Northern Dipper—ascending, descending, and circulating infinitely. Through lunar phases and hexagram transformations, this chapter vividly illustrates the celestial rhythms governing alchemical fire phases (huohou) and cosmic circulation.

This passage elucidates the mysteries of Yin-Yang transformations and the Great Dao of the Golden Elixir (Jindan) in Daoist cultivation. The celestial moon traverses twelve positions to unite with the sun (known as "conjoining jade disks"), while its earthly counterpart, the "lesser Yin," manifests twelve subtle variations. These profound rhythms of Yin-Yang remain unfathomable to most—only sages who contemplate the Supreme Ultimate (Taiji, the cosmic origin) can grasp their secrets.

The scripture employs solar-lunar cycles as metaphors for cultivation principles: During the new moon (when sun and moon conjoin), the moon lies beneath the sun like a woman obscured beneath her partner during intercourse. This moonless phase corresponds to the primordial, undifferentiated state before the emergence of consciousness in cultivation. Only when the third lunar day arrives does Yang energy begin stirring, initiating the interplay of Yin-Yang—mirroring the natural flow of energies between heaven and earth.

The profundity of the Great Dao of the Golden Elixir (the pinnacle of Neidan practice) transcends even celestial deities' comprehension, for it embodies the primordial Qi (the universe's foundational energy). Sages cultivate the Golden Elixir through four approaches: harmonizing with cosmic patterns, emulating solar-lunar movements, aligning with seasonal transitions, and discerning the auspicious and inauspicious aspects of Yin-Yang. Such practice requires reversing ordinary principles—just as water naturally flows downward, adepts must invert its nature in alchemical work.

The passage concludes by emphasizing the importance of commencing cultivation from the northeast (the celestial quadrant of the Ji-Dou constellations), where each new moon's solar-lunar conjunction occurs. Northeast corresponds to the Gen trigram in the Bagua (symbolizing mountain and stillness), representing the critical juncture where Yin energy penetrates Yang. Called the "ghost path," this signifies the pivotal moment for Yin-Yang transformation in spiritual practice.

This scripture primarily uses lunar phases as metaphors for the Neidan (internal alchemy) cultivation process. It describes how the moon loses its radiance when moving to specific celestial positions, mirroring how ordinary people follow the cycles of birth, aging, illness, and death according to the mutual generation and restraint of the Five Phases (Wood, Fire, Earth, Metal, Water). The moon's rightward motion (as ancient astronomers believed celestial bodies moved rightward) causes it to darken at certain points, only to reappear with faint light in the Geng direction (west), resembling the crescent moon of the third lunar day—a symbol of Yang Qi's initial emergence.

At the first quarter moon (eighth day), Yin and Yang achieve balance, comparable to how the Dui trigram (representing the youngest daughter) takes over the operational role from the Kun trigram (earth). The full moon (fifteenth day) shines completely, symbolizing the "mutual generation of metal and water" state in Golden Elixir cultivation. Here, practitioners must emulate the moon's caution, avoiding the pitfalls of overfullness. Sages maintain perpetual vigilance, regulating their cultivation rhythm through the symbolic principles of the Xun (wind) and Gen (mountain) trigrams.

During the last quarter moon, the Golden Elixir gradually solidifies. Like lead and mercury (alchemical materials) being refined and transformed, it ultimately coalesces into the perfected elixir. Though described through a single lunar cycle, actual cultivation requires the prolonged gestation of "ten lunar months," or even three to twelve years depending on individual progress.

True Dao attainers can recreate Yin-Yang dynamics, establishing new alchemical systems. Just as celestial motions cycle endlessly from the new moon (symbolizing renewal) to the Fu hexagram (representing Yang Qi's rebirth), cultivation follows a spiral of recurring refinement. The text concludes with "the functional changes of hexagram lines," illustrating how from the Fu hexagram onward—like the foundational note Huangzhong marking the winter solstice's Yang rebirth—Yang Qi grows progressively, with radiance increasing daily. This entire process metaphorically depicts the transformation and elevation of Jing (essence), Qi (vital energy), and Shen (spirit) in Neidan practice.

This scripture uses the twelve-month cycle of seasonal changes as a metaphor for the Neidan (internal alchemy) cultivation process. It begins by describing the alternating Yin-Yang phenomena in the twelfth lunar month (Chou), likening it to wheel spokes gathering at the position of Yin (first month). As time progresses into the second month (Mao), elm seeds fall and return to their roots, illustrating nature's cycles of destruction and growth.

In the third month, rising Yang energy resembles a bird shaking dust from its wings, while the fourth month sees the Qian (Heaven) Yang energy shining brightly in all directions. By the fifth month, the Gou hexagram appears—like treading on thin frost—marking the transition where extreme Yang gives birth to Yin. The sixth month brings cold well water as Yang energy retreats and Yin dominates; practitioners should gather their Shen (spirit) and await the right moment. During the seventh month's Pi hexagram, blocked Yin-Yang interaction halts plant growth as Yin overpowers Yang. The mid-autumn eighth month reveals nature's waxing and waning: old trees sprout new buds while shepherd's purse shoots emerge. When the ninth month's Bo hexagram arrives, the physical form wastes away as Jing (essence) exhausts itself, ultimately returning to Kun's primal state (pure Yin).

The text emphasizes aligning with cosmic rhythms—Yin-Yang cycles form an endless interlocking chain. The Dao of cultivation remains profoundly mysterious; losing one's way before grasping the essentials mirrors natural law, just as emperors maintain lasting rule by following heavenly principles.

The latter section deciphers the Zhouyi's Fu hexagram (symbolizing Yang's initial rebirth) for cultivation: sages following this path transcend mundanity, while heretics perish. Quoting King Wen's "friends arrive without blame," it shows how fellow practitioners' distant support brings no harm. "Returning in seven days" references both lunar phases (the crescent moon's reappearance after seven days) and the body's seven-day Jing-Qi cycle. Confucius' insight—"Fu reveals the heart of Heaven and Earth"—ultimately identifies this hexagram as embodying creation's ceaseless vitality.

Note: This passage correlates the Zhouyi's twelve monthly hexagrams with alchemical practice, assigning specific cultivation focuses to each moon phase while stressing harmony with Yin-Yang dynamics. "Elm seeds" denote the tree's fruit, "wing feathers" represent avian plumage, "Ruibin" musically symbolizes the fifth month, and "Dragon's Tail" (Tail constellation) marks celestial conjunctions of sun and moon.

Most people fail to comprehend the fundamental essence of heaven and earth. Laozi (founder of Daoism) termed this essence the "Mysterious Feminine Gate" (referring to the source of all creation), while Master Yunfang (Zhongli Quan, one of the Eight Immortals) called it the "Gate of Life and Door of Death" (signifying the pivotal point of life's cyclical transformation).

The Book of Changes states: "Thunder within the Earth—this is the image of the Fu hexagram. Ancient sage-kings would enter retreat during the winter solstice, when merchants ceased travel and rulers suspended governance." Here, thunder (representing vigorous Yang Qi) concealed within earth (symbolizing yielding Yin Qi) serves as a metaphor for the restoration process of primordial Qi (the most fundamental life energy). The sage-kings chose this day for seclusion precisely to eliminate worldly distractions and focus wholly on cultivation.

Merchants symbolize mundane affairs—"ceasing activity" means severing these trivial matters to concentrate on spiritual practice. The Commentary on the Images explains: "The nearby return is for cultivating one's person," and further states: "Walking alone in rectitude and returning is to follow the Dao." This describes the mental state of sages when Yang Qi first stirs at each new moon. The concept of "return" (Fu) requires initial concealment before reappearance. When Yang Qi first emerges, its flow is smooth and unobstructed—like the faint, vigorous energy measured by the sundial's shadow, embodying the straightforward strength of the Qian hexagram (representing heaven).

The Huangzhong pitch (first of the twelve musical tones) corresponds to the eleventh month (Zi month), with "omen" signifying the initial sprouting of all things. At this time, gentle Yang Qi nourishes creation, allowing all beings to perceive warmth and restore their natural life rhythms. Master Shangyang (a Daoist internal alchemist) particularly emphasized: The crucial point of alchemical practice lies precisely here—it must never be underestimated.

After receiving authentic transmission from their masters, practitioners must comprehend the essential principles of the "Three Passes and Three Periods":

First Stage: Prepare the cultivation space and gather the medicinal ingredients (Neidan terminology referring to Jing, Qi, and Shen). With ingredients prepared, foundational practice through breath regulation generates mild warmth within—this marks the first period of the initial pass.

Second Stage: Formal entry into the alchemical process involves harmonizing body and mind, opening energy pathways while maintaining balanced moderation. One should remain humble and unobtrusive, like the gradual lengthening of daylight symbolized by the Dalü pitch (corresponding to the twelfth Chou month)—this constitutes the second period of the middle pass.

Third Stage: When the Dacu pitch (first month, Yin month) arrives, ascending Yang Qi forms the Tai hexagram (earth above heaven). Here Yin Qi resides above like water moistening downward, while Yang Qi below resembles flames rising upward—their mutual interaction mirrors the Xian hexagram's "softness above and firmness below," where both energies resonate. Practitioners must invert the Five Phases' (Wood, Fire, Earth, Metal, Water) customary operations, letting yielding Qi lead and vigorous Qi follow—like the feminine (Yin) taking precedence while the masculine (Yang) complements. When Metal Qi (lung energy) becomes abundant and Yang Qi reaches fullness, one attains the third period of the lower pass—the harmonious union of firmness and softness, the sacred intercourse of Yin and Yang.

This scripture elucidates the principles of Yin-Yang transformation during alchemical practice and how to cultivate the Golden Elixir (Jindan) in harmony with celestial patterns. It employs the twelve hexagrams of waxing and waning from the Book of Changes (Fu, Lin, Tai, Dazhuang, Guai, Qian, Gou, Dun, Pi, Guan, Bo, Kun) to symbolize twelve phases of Yin-Yang alternation in internal alchemy (Neidan).

The text begins by describing the condensation of the Golden Elixir within the Yellow Court (Dantian), emphasizing the need for meticulous concentration. When Yang energy reaches fullness (Guai hexagram phase), the Golden Elixir begins to gestate. At the Qian hexagram stage, metallic Qi achieves purity; during the Gou hexagram, Yin energy starts emerging while Yang withdraws inward. By the sixth month (initial Yin line of Kun hexagram), Yin energy gradually ascends. The seventh month marks blocked communication between Yin and Yang (Pi hexagram), while the eighth month observes autumn's imagery (Guan hexagram) — mirroring cyclical rebirth like wheat sprouts or shepherd's purse budding. Ultimately, the Yin-Yang cycle returns to Kun's primal state (pure Yin), perpetually revolving in accordance with celestial law.

The author notes this passage's unique structure: lacking an introductory summary but concluding with two pivotal lines — "The primal mystery stretches vast yet remains interconnected across barriers." This signifies that while Yin-Yang energies appear profoundly elusive ("primal mystery"), the Yellow Matron (mediating force) harmonizes them, enabling distant polarities to merge. Sages master alchemy precisely by comprehending these transformational patterns.

Quoting the Kun hexagram — "First straying from the Dao (Way), later yielding to gain constancy" — the text illustrates how yielding Yin ultimately becomes dominant ("Yin assumes lordship"). Like water forming waves at its stillest extreme, this embodies natural law. Through hexagram transformations, the passage reveals that alchemy must follow nature's rhythms of waxing-waning polarities and reversal at extremes.

This passage explores two core themes: the legendary Yellow Emperor's path to immortality, and the Daoist cultivation principle of dual cultivation of nature and life (xingming shuangxiu).

The Yellow Emperor's ascension story unfolds across three lifetimes. In his first incarnation as a commoner, he cultivated worldly virtue (De). As a minister in his second life, he developed transcendental merit. Only in his third existence as a ruler did he renounce the throne to retreat to Mount Dinghu (later called Junshan in Dongting Lake, named for his alchemical practices). There he refined the Nine-Cycle Elixir (jiuhuan dan), achieving the legendary "daytime ascension astride a dragon" upon its completion. This narrative illustrates how spiritual realization requires cultivation across multiple lifetimes, showing even emperors could attain longevity by mastering the Dao's principles of cosmic cycles.

The text then elucidates the cultivation of vital essence (Jing) and spirit (Shen). The human body originates from primordial essence (yuanjing), with the Yin and Yang energies forming the ethereal soul (hun, solar Yang spirit) and earthly soul (po, lunar Yin spirit). These complementary forces resemble a house and its owner—the innate nature (xing) governs internally like a resident, while emotions (qing) function externally like city walls. Harmony between them brings stability.

The crux of practice lies in balancing Yin-Yang: The Qian (Heaven, Yang) principle activates and circulates vital energy (Qi), while Kun (Earth, Yin) embodies stillness as the Dao's dwelling. Their dynamic interaction generates the "nine returns and seven reversions" (jiuhuan qifan), the Neidan process where lung-metal (Jin) and heart-fire (Huo) merge, achieving the alchemical union of water (kidneys) and fire. Among the Five Phases, water's purity best represents the Dao's essence.

Human gestation mirrors cosmic beginnings—from undifferentiated chaos (like an egg) to form through ten lunar months. Cultivation reverses this process to return to primordial purity. Nurturing one's nature (yangxing) forms the foundation for cultivating vitality (xiuming). When nature flourishes, Yang energy remains intact and essence is preserved internally—the prerequisite for refining the Golden Elixir (Jindan). The text laments how few understand this unity of spiritual nature and physical life.

Some mistakenly regard the physical heart as their true nature, or confuse wandering thoughts for their fundamental being. Others take fleeting sensations as their essence, stubbornly cling to empty nothingness as their nature, or consider momentary thoughts to be life itself. How could they know that the profound and mysterious existence is the true life force? How could they comprehend that the ever-generative gate of creation is the very essence of life? Such blind conjectures can never grasp the Great Dao of the sages.

The Yellow Emperor said: "Heaven endows humans with their fundamental nature, while the human heart schemes with cunning. Noble persons who attain the Dao can abide in their true nature, while petty persons who attain it will recklessly disregard life." Confucius taught that only by exhaustively investigating principles and fully manifesting one's nature can one understand the Mandate of Heaven. Mencius spoke of preserving the heart-mind and nurturing one's nature to accord with Heaven's decree—whether life be long or short, one should devote oneself to self-cultivation while awaiting Heaven's will. This is the way to establish one's life and settle one's nature. By Mencius' time, the sages' teachings had become perfectly clear.

The ancient sages created the Book of Changes precisely to accord with the principles of nature and life: Heaven's Dao speaks of yin and yang, Earth's Dao of firmness and yielding, and the human Dao of benevolence and righteousness. Celestial immortals say: "How can one become a sage by cultivating only nature without life? To cultivate nature first and then life is the proper path of practice." Some claim Buddhism cultivates nature while Daoism cultivates life—but how could the Great Dao of Heaven and Earth be divided? This misunderstands Mencius' teaching of "preserving the heart-mind, nurturing nature, cultivating the self, and establishing life." To properly establish nature and life, one must first nurture one's fundamental nature. Without awakening to one's true nature, how can one comprehend the principles of life? Thus the Doctrine of the Mean states: "What Heaven imparts is called nature; following this nature is called the Dao." The heart-method of the sages has always been perfectly consistent.

When speaking of nurturing nature and extending life, most people don't know how to nurture their nature. Lü Dongbin (one of the Eight Immortals) used alchemical metaphors to reveal this; not knowing how to establish life, Zhang Daoling and Xu Xun (Daoist patriarchs) also employed alchemical analogies. "Refining the essence and unifying the one, holding faithfully to the center" is the way to nurture nature; "the intercourse of male and female essences gives birth to all things" is the method to establish life. Accumulating vital essence (Jing) and Qi is nurturing nature; harmonizing yin and yang is establishing life. Sadly, some clever people stubbornly insist that where there is birth there must be death—how could there be any longevity? They fail to realize that sages, worthies, and buddhas are all born of Heaven and Earth—how could teachers transmit this? How could humans forcibly attain it? If one doesn't deeply contemplate the origin of life but willingly resigns to fate awaiting death, consider this: From where does our body come? If we say it's born from our parents' yin and yang Qi, then through refining this yin-yang Qi, we can naturally prolong life and achieve immortality. Thus cultivating the Golden Elixir (Jindan) is essentially refining our innate prenatal Qi with which we are born.

This scripture primarily elucidates the Yin-Yang principles and alchemical methods of Daoist Neidan (internal alchemy) practice. It begins by pointing out that all things in the world are fundamentally undifferentiated, with the key lying in understanding the "reverse and forward" operations of the Dao. As Confucius said, "Without understanding life, how can one comprehend death?" The sages precisely reveal the patterns of Yin-Yang transformation by clarifying the essence of life.

Ordinary people follow natural laws to procreate, while Daoist practitioners cultivate in reverse to form the Neidan (the crystallized internal energy). The "primordial Jing (essence)" mentioned here resembles diffuse cloud-like Qi (vital energy), existing by relying on primordial Qi. Yin and Yang manifest through the media of Hun (ethereal soul) and Po (corporeal soul), while these souls in turn reside within Yin and Yang—the Li trigram (fire) symbolizes the solar Hun, and the Kan trigram (water) represents the lunar Po. The Po, belonging to Yin, contains Yang and corresponds to Wu earth; the Hun, belonging to Yang, contains Yin and corresponds to Ji earth. The souls mutually depend on each other as Yin and Yang intermingle: Xing (innate nature) governs the internal preservation of Jing, while Qing (emotional desires) governs the external subduing of Qi, much like building city walls to protect the inner sanctum. Here the "inner city" refers to the vessel containing essential refinement, while the "outer walls" signify the furnace and cauldron for alchemical work.

During cultivation, the vigorous quality of the Qian trigram (heaven) enables the union of Jing and Qi, while the receptive quality of the Kun trigram (earth) forms the space for practice. When the unyielding Qi is released, it naturally contracts; when the softened Qi operates, it nourishes growth. The elixir undergoes repeated refinement in the cauldron, forming the cycle of "nine returns and seven reversions": "nine returns" indicate the return of metal Qi (the four phenomena generate metal, the nine palaces form silver, dragon and tiger unite); "seven reversions" signify the reflective return of fire essence (the two modes generate fire, the seven regulators form cinnabar, Hun and Po attract); "eight homecomings" represent the chemical transformation of wood mercury (the three powers generate wood, the eight trigrams form mercury, Wu and Ji combine); "six dwellings" denote the fusion of lead and mercury (Taiji generates water, the six harmonies form lead, Xing and Qing resonate).

Male and female symbolize the forms of the Dao (white male and red female representing metal and fire restraining each other), with the Azure Dragon (wood) being refined by Dui's metal Qi to become white, while the White Tiger (metal) is tempered by Li's fire essence to become red. Practice requires precise control of water and fire like preparing an altar: adjust the fire according to the water's measure, and regulate the intensity to refine properly. This marks the initial stage of Five Phases transformation—the most perfect water (supreme goodness resembles water) contains metal nature, and only flawless clarity can generate change. The concrete manifestation of the Dao appears as male and female (Yin-Yang), while its fundamental principles are embodied in Qian and Kun (heaven and earth).

This scripture primarily elucidates the wondrous state of mutual transformation between Yin and Yang energies during Neidan (internal alchemy) practice. It begins by describing how the "Zhenyi Zhiqi" (primordial Qi) cannot be depicted through concrete forms—it circulates according to natural laws, much like the Wood phase of the East (Jia-Yi) and Metal phase of the West (Geng-Xin) each follow their own courses. When the inner elixir first takes shape, it appears perfectly round like an egg, with intermingled black and white symbolizing the harmony of Yin-Yang. Initially no larger than a millet grain, it gradually expands to fill the entire body, nourishing the five viscera, sinews, and bones. After ten months of cultivation, the perfected elixir transforms into the Yang Shen (spiritual embodiment), a condensation of primordial Qi that becomes luminous and supple—as smooth as powdered lead—fundamentally distinct from the ordinary physical form born of postnatal essence and blood.

Chapter 21 employs vivid analogies to illustrate Yin-Yang interaction: the yangsui (ancient bronze mirror for fire-making) requires sunlight to ignite flames, while the fangzhu (ancient dew-collecting vessel) needs moonlight to condense water. Though sun and moon remain distant, their Yin and Yang energies still resonate across space—how much more should the true Yin (kidney's authentic Water) and true Yang (heart's authentic Fire) within our bodies, existing in such close proximity? The author criticizes later practitioners who miss the essence: the human body's Yin-Yang operates like celestial luminaries, where the mutual generation of water and fire mirrors the circulation of Jing (essence) and Qi. Even inanimate objects demonstrate this resonance—how much more should sentient human organisms? The key lies in mastering correct cultivation methods.

A crucial distinction is drawn between Yang Shen and the mortal body: the spiritual form originates from primordial true lead (essential Jing-Qi), making it luminous and pure, whereas the physical body derives from postnatal essence-blood, resulting in heaviness and turbidity. This echoes Chapter 6's teachings on "self-nourishment," both emphasizing the alchemical process of refining the postnatal to return to the primordial state.

Among all beings between heaven and earth, humans possess the highest wisdom. Even the most humble and dull person instinctively understands how Yin-Yang transforms and generates all things, comprehending this truth without needing deliberate instruction. However, ordinary people only know how to follow the way of Yin-Yang to reproduce life—the profound mystery of reversing Yin-Yang cannot be grasped without guidance from an enlightened teacher.

The so-called "reverse application of Yin-Yang" refers to refining Jing (essence) into Qi (vital energy) to achieve the Golden Elixir (Jindan). This chapter specifically elucidates the profound mechanism of how the two energies of Yin and Yang interact and mutually create life.

Chapter 22, "The Three Key Treasures," states: During cultivation, the three crucial gates—ears, eyes, and mouth—must be closed and not allowed to disperse energy outward. A true practitioner should withdraw inward like diving into deep waters, allowing the Shen (spirit) to rest peacefully in the Dantian (energy center) like a swimming fish. By harmonizing the opening and closing of breath with internal rhythms, this becomes the central pivot of practice.

Between movement and stillness, energy circulates endlessly: the energy of the Li trigram (symbolizing heart fire) turns inward to nourish, the energy of the Kan trigram (symbolizing kidney water) need not leak outward, and the energy of the Dui trigram (symbolizing speech) is no longer wasted on idle talk. Speaking less aligns with nature's way. When these three key apertures are properly restrained, the body relaxes in a quiet chamber, the will returns to emptiness, and the mind maintains its natural state of no-thought.

When cultivation reaches the point where external things cannot disturb you, the Shen remains focused and undistracted. During sleep, maintain awareness; while awake, observe the rise and fall of breath. The complexion gradually becomes radiant, and the bones grow stronger day by day. When all turbid Yin and pathogenic Qi are expelled from the body, pure Yang energy naturally establishes itself.

With continuous practice, the internal Qi will flow like nourishing clouds and rain, like spring water, or melting ice—effortlessly circulating from the crown of the head down to the feet and back upward again, unobstructed throughout the body, filling it like mist in a valley. Reverse cultivation is the verification of the great Dao, while gentleness and stillness are the root of De (Virtue). Clearing away accumulated impurities and regulating subtle energy channels will eventually transform turbidity into clarity, turning prolonged darkness back to light.

This chapter reveals in detail the core secrets of alchemical cultivation. After receiving oral transmission from a master, seekers of the Dao should recite this chapter ten thousand times, contemplating each sentence and pondering every word—never reading hastily. Even a single uncomprehended character can hinder the achievement of the Golden Elixir.

Because this chapter contains the most essential teachings of the Cantongqi, some mysteries cannot be fully conveyed in words—they are celestial secrets treasured by heaven. Human nature is inherently good at birth, but unless one possesses extraordinary aptitude and steadfastly preserves their original heart, they will inevitably be led astray by unworthy companions and deluded by sensory desires.

The six roots—eyes, ears, nose, tongue, body, and mind—cling to external phenomena, and daily actions constantly deplete Qi. Among these, the harms caused by indulging the ears in sounds, the eyes in sights, and the mouth in flavors are the most severe. All kinds of blessings dissipate due to attachment to external realms.

This scripture discusses three crucial points requiring special attention in spiritual cultivation: the ears, eyes, and mouth. Many Dao practitioners fail to achieve success precisely because they fall victim to disturbances arising from these three—ears believing slanderous words, eyes chasing external appearances, and mouths speaking recklessly to invite disaster, thereby losing one's original authenticity. The immortal master Wei Boyang designated these three as the "Three Treasures," demanding practitioners maintain constant vigilance.

When truly entering the chamber for practice, one must completely stabilize the six roots (eyes, ears, nose, tongue, body, and mind) before undertaking the work of gathering medicinal ingredients and refining the elixir. Here, the "True Person" (zhenren) refers to "Ji Earth" (the body's innate prenatal energy), which must sink into stillness like diving into deep waters. One uses Ji Earth to harmonize Kidney Water (Kan Water) to achieve elixir formation. The "Central Cauldron" (guizhong) denotes the wondrous creative space of the dantian (energy center). During elixir refinement, one must maintain vigilance like floating algae—both tranquil and ever-responsive, never departing from this state even momentarily.

In practice, pay attention to these points: the gaze should turn inward (symbolized by the Li trigram's inner illumination), the ears should listen inwardly (symbolized by the Kan trigram's introversion), and the mouth should speak sparingly (symbolized by the Dui trigram's silence). Only by mastering these three can one dwell peacefully in the pure environment of cultivation. "Emptiness-Nothingness" (xuwu) is the source from which primordial qi arises. One must relinquish distracting thoughts and concentrate wholeheartedly to perceive it. Most crucially, maintain a state of "no-thought" (wunian)—when the True Person practices in concealment, there is no-thought correspondence; when floating algae guard the elixir, there is no-thought waiting; when breath harmonizes, there is no-thought guidance. This no-thought is not dull ignorance but an inner state of subtle awareness.

This passage elucidates the essential principles of Neidan (internal alchemy) practice. During cultivation, one must naturally blend Jing (essence), Qi (vital energy), and Shen (spirit) while maintaining a state free from distracting thoughts. The practitioner must achieve sensitivity, patience, the ability to attract, and the capacity to enter—only then will the effects become evident. Therefore, this state should be maintained as the norm.

The text mentions "Wu" (referring to Yang Earth among the Five Phases) as resembling the White Tiger (symbolizing Western Metal), whose nature is prone to change and difficult to stabilize. If "Ji Earth" (Yin Earth) is used to harmonize it, one must remember not to alter it arbitrarily. If the mind lacks focus, adverse transformations may occur. While "no-thought" is emphasized earlier, here the text also stresses "maintaining single-minded concentration without distraction"—this requires careful contemplation.

Even during sleep, one should preserve the state where Shen and Qi guard each other, neither scattered nor unsettled. In this condition, Shen and Qi naturally embrace. Simultaneously, constant awareness must be maintained to observe the fluctuations of genuine Qi within the body. When the alchemical practice reaches this stage, verification will naturally arise. The author mentions how he initially found this stage difficult when first receiving his master's transmission, but later, while practicing on Daluo Mountain, it became easier. The key lies in uninterrupted cultivation to complete the entire process.

The Immortal Elder (referring to Wei Boyang) particularly emphasizes that during herb-gathering and refining, not the slightest error can be tolerated. As practice deepens, one's complexion will gradually become radiant. Every sentence in the scripture is crucial—none is superfluous. After attaining the Golden Elixir, various natural confirmations will manifest. Cultivating transcendent Daoist methods in the "world of five turbidities" (referring to the defiled mortal realm) will ultimately bear fruit if one perseveres without cessation. Do not abandon the path due to minor obstacles, for turbidity is actually the path to purity, and prolonged darkness will eventually give way to light. Thus, attaining sagehood and immortality is within reach—the effects are swift, hence the term "Divine Elixir."

Chapter 23 discusses the futility of heterodox methods. Ordinary people are fond of minor techniques, unable to discern the depth of Daoist practice. Abandoning the true path for deviant shortcuts, seeking quick results only leads to stagnation. It is like a blind man discarding his cane, a deaf man listening to music, diving into water to catch pheasants and hares, climbing mountains to find fish and dragons, planting wheat yet expecting millet, or using a compass to draw squares—wasting energy year after year without achieving anything. One must understand that the true method of "internal ingestion" (Neidan) is actually simple and uncomplicated.

People favor minor techniques, but these are not the Great Dao. If one's capacity is too narrow, they will never hear of the Great Dao. The Great Dao encompasses heaven and earth, vast and deep as the ocean. The reason people fail to hear of it is often because they are first misled by "blind teachers" (those ignorant of truth), forming preconceptions that block them from encountering the true path. Heterodox methods often emphasize "combative harvesting" (referring to sexual alchemy and other deviant practices), abandoning the true path for shortcuts. Taking elixirs to become light and ascend, seeking rapid success, only leads to obstruction.

This passage reveals the essential techniques of Neidan (internal alchemy), the Daoist practice for attaining longevity. Without understanding how to nurture Jing (essence) and Qi (vital energy), one is like a blind man without a walking stick—utterly vulnerable. Merely debating Daoist theories is as meaningless as a deaf person listening to music. Such misguided efforts are as futile as hunting pheasants underwater, seeking fish-dragons on mountains, or expecting millet harvests from wheat fields—all actions defying natural principles.

The text emphasizes the crucial practice of "subduing Qi": while suppressing vital energy is necessary, blind suppression cannot confer immortality. One must master the secret techniques passed down by ancient immortals, teachings reserved only for destined and enlightened practitioners.

Chapter 24, "The Flowing Pearl and Golden Splendor," describes the transformation of Yin-Yang energies in Neidan practice. The "Solar Flowing Pearl" (symbolizing Shen/spirit) tends to scatter and must unite with "Golden Splendor" (representing Jing/essence), congealing like water turning to ice. The mutual attraction and fusion of Yin-Yang energies mirror the dragon (Shen) calling to the tiger (Jing), the mother nurturing the child, or the father passing on his legacy. The interplay of the Five Phases (Wood, Fire, Earth, Metal, Water) and the unification of the Three Treasures (Jing, Qi, Shen) with the Five Viscera energies represent the universe's most profound principles—truths transmitted orally rather than through written words.

Natural metaphors illustrate these concepts: when Mars appears in the west or Venus crosses the sky, calamity follows; just as cats hunt mice and eagles seize small birds, these are cosmic patterns. Ignorance of such principles means wasted fortunes and starving families, with no spiritual achievement. Throughout history, countless seekers of immortality have strayed from the Dao by chasing rare herbs while missing the greater truth.

The chapter ultimately unveils the Yin-Yang nature of "Flowing Pearl" and "Golden Splendor," along with alchemical secrets. The "Solar Flowing Pearl" embodies the Yang essence within the Li trigram (Qian as heaven, representing the father), while cinnabar's mercury resembles the quintessence within sand. Ordinary people, deluded by the "six thieves" (senses and mind), rarely grasp these profound truths.

This passage explains the principles of mutual generation and restraint between Yin-Yang and the Five Phases (Wood, Fire, Earth, Metal, Water) in Daoist alchemy. During the alchemical process, Metal (representing true Water within the Kan trigram) restrains cinnabar-mercury (found in the Li trigram). Through the transformative interaction of Water and Fire, a white elixir liquid is ultimately refined. Throughout this process, the Five Phases mutually constrain yet continuously transform into one another.

The practitioner must carefully regulate timing and fire intensity, just as Metal melts when encountering Fire, or Wood becomes restrained when meeting Metal—yet when Fire flourishes, it generates Earth, which in turn produces Metal. The eastern and southern directions correspond to Wood and Fire, while the western and northern belong to Metal and Water, with Earth at the center. This constitutes the "Three-Five numerical pattern" governing celestial and terrestrial movements. Only by comprehending these cyclical relationships can the alchemist succeed.

The text employs vivid metaphors to illustrate Yin-Yang interactions: the dragon and tiger attracting each other, the crow and hare chasing one another, the coupling of man and woman, or the tortoise swallowing the snake—all symbolizing the fusion of Yin and Yang Qi during alchemy. Particular attention must be paid to harmonizing the astringent energy of the western Dui trigram (representing Metal) with the refining power of the southern Li trigram (Fire), operating as naturally as a cat catching mice or sparrows avoiding hawks.

The passage concludes by emphasizing that without oral instructions from an enlightened master, attempting to deduce alchemical methods through speculation alone will only waste family resources. This underscores the Daoist tradition's particular emphasis on lineage transmission in spiritual cultivation.

This scripture primarily critiques misguided cultivation methods and emphasizes that encountering a genuine enlightened master is essential for attaining the Dao. Since ancient times, while many have sought the Dao, few have met a true teacher. Most fail to comprehend the principle of Yin-Yang mutual generation, let alone recognize the need for "kindred substances" (specific materials required for alchemical practice) in refining the elixir. They exhaust their true Qi (primordial vital energy) in futile searches for rare herbs and minerals—lifeless materials like metals, stones, plants, and wood that bear no spiritual resonance with the Dao. Such pursuits are utterly divorced from authentic practice, straying thousands of miles from the true path.

The scripture specifies how to discern a genuine master: A true teacher possesses complete mastery of alchemical classics like the Cantongqi, whereas impostors falter at nine out of ten questions, resorting to outlandish claims to mislead seekers. Some mistake silent sitting for cultivation; others spend days meditating on emptiness yet cannot explain core alchemical concepts like "cinnabar and mercury" (symbolizing Yin-Yang energies) or "tiger and dragon" (representing the dynamic interplay of Metal and Wood phases). Foolishly, many assume anyone who meditates for years or visits sacred grotto-heavens must have attained the Dao—ignoring Zen Master Mazu’s parable of "polishing a brick to make a mirror" (a metaphor for futile methods) and remaining blind to the fundamental laws of Yin-Yang interaction.

Even more laughable are worldly types who parrot Zen koans, mistaking empty talk of Buddha-nature for cultivation. What do they know of true "innate nature" (embodied by the Qian hexagram’s unbroken lines, representing steadfast Yang purity) or "Chan" (manifest in the Kun hexagram’s yielding lines, symbolizing receptive openness)? Authentic practice unites Chan and nature like blending earth to temper lead (harmonizing opposites); it reconciles Metal and Wood as lead stabilizes mercury (balancing Yin-Yang); it nurtures Qi through benevolence and righteousness. This is the Dao’s supreme principle: one Yin, one Yang, mutually sustaining.

A final analogy warns: True methods yield immediate results, like a shadow cast by a upright pole or echoes in an empty valley. But ingesting toxic herbs like wild aconite or croton seeds brings irreversible ruin—even King Wen’s divinations, Confucius’s omens, Bian Que’s acupuncture, or Wu Xian’s ritual drums (renowned ancient healers and shamans) could not save you. Thus, the scripture cautions: Stray from the path, and the consequences are beyond remedy.

This scripture elucidates the principles of Yin-Yang harmony and the alchemical cultivation of the Dao. The interplay of Yin and Yang constitutes the fundamental law governing the generation and transformation of all things in heaven and earth. Just as the rising sun (the first Yang) heralds the awakening of vital energy, the Li trigram (representing fire in the Bagua) symbolizes meditative practice, while the "water palace" (referring to kidney essence where Daoists believe primordial Qi resides) serves as the crucible for refining the Golden Elixir (Jindan).

Though cultivation methods may follow three distinct paths, their essence adheres to the principle of "like attracts like." Just as the Five Phases (Wuxing) interact through generation and restraint, and Yin-Yang wax and wane in perpetual cycles, all phenomena follow natural laws. Even the actions of supreme sages merely embody the proper application of Yin-Yang principles. The transformation between Kun and Dui trigrams (representing yielding Yin) nurtures life, while the alternation of Qian and Zhen trigrams (representing strong Yang) facilitates creation. When primordial Qi (Yuanqi) and vital essence (Jing) coalesce, they form the indestructible Golden Elixir, enduring as eternal as metallic ores.

Successful cultivation requires single-minded focus—like seeing an instant shadow when raising a hundred-foot pole, or hearing immediate echoes when shouting in valleys—for Yin-Yang interaction manifests nature's most potent phenomena. Even poisonous plants like wild kudzu and croton possess virulent properties; how much more powerful then must be the spiritual union of true Yin and true Yang energies? Such convergence inevitably crystallizes into the numinous elixir.

Chapter 26, "The Maiden and Yellow Sprout," further explains: The "maiden" (referring to the body's Yin essence) possesses extraordinary mobility and disperses when encountering fire (Yang Qi), requiring the "yellow sprout" (nascent Yang energy) to stabilize it. Defying the heavenly principle of Yin-Yang complementarity resembles a hen attempting to hatch eggs alone—doomed to fail. The state of conjugal union demonstrates inseparable harmony between firm and yielding forces, governed not by human will but by natural law. Just as flames ascend and water flows downward, this is innate nature. Observing conjugal union reveals this bonding isn't learned but inborn. The form manifest at birth persists even in death—all are natural expressions of Yin-Yang communion.

This passage particularly emphasizes that alchemical practice must emulate natural Yin-Yang interaction without violating celestial principles. Like curing illness with targeted remedies, cultivation requires precise Yin-Yang matching to crystallize the elixir.

This scripture elucidates that the essence of Neidan (internal alchemy) cultivation lies in harmonizing Yin-Yang. The "river's surface" metaphorically represents the ocean of human desires, while the "charming maiden" refers to the yin energy (yin mercury) within the human body. This energy can both nourish life and deplete primordial Qi. When the mind attains stillness, the internal energy naturally nurtures; but when desires stir, the energy becomes uncontrollable like mercury scattering when heated, difficult to reclaim.

The fundamental practice involves using "yellow sprouts" (the innate pure yang Qi, also called true lead) to subdue yin energy. Just as lead stabilizes volatile mercury, only through the proper pairing of Yin-Yang can stability be achieved. Authentic cultivation isn't about escaping worldly life, but comprehending the principle of Yin-Yang mutual generation. Those who believe one must retreat to mountain seclusion, abandon family ties, or practice extreme asceticism to attain the Dao fundamentally misunderstand cultivation's true nature.

The scripture employs the metaphor of a hen incubating eggs to illustrate: yin energy alone (like the hen) cannot complete life transformation, just as eggs without a rooster's participation cannot hatch. Similarly, Neidan practice requires Yin-Yang union, mirroring how all natural growth depends on this interplay. The allegory of the "Land of Women" (a realm of pure yin without yang) further emphasizes: without Yin-Yang interaction, the sublimation and transformation of life remains impossible.

This scripture primarily elucidates the principles of Yin-Yang interaction in Daoist Neidan (internal alchemy) practice, along with essential techniques concerning the correspondences between male-female, sun-moon, and fire-water dynamics.

Regarding conception through sexual union, the text states: For a woman to conceive, she must select auspicious timings and gaze into a well three times daily to absorb the authentic Qi (primordial energy) from the well water. This Yin-Yang interaction is achieved through observing water reflections, aligning with the natural resonance between heaven and earth. Just as fire inherently rises while water naturally descends, these patterns require no human instruction. The text particularly emphasizes the "male above, female below" position during intercourse as a natural law—even drowned corpses assume this posture, demonstrating it as the fundamental principle of Yin-Yang interaction.

In the "Mutual Dependence of Male and Female" section, the Kan (Water) and Li (Fire) trigrams from the Bagua (Eight Trigrams) symbolize Yin-Yang relations: Kan represents the moon and middle-aged male, while Li signifies the sun and middle-aged female. The moon emits no light itself but reflects solar radiance; similarly in cultivation, Yin energy requires Yang nourishment. Imbalance manifests as celestial phenomena like eclipses, portending calamities.

The crux of practice lies in maintaining Yin-Yang equilibrium: the male actively gives while the female quietly receives and stores. Like metal melting into fluid or fire generating earth to restrain water, practitioners must regulate desires to balance the Hun (Yang soul) and Po (Yin soul), maintaining the body in a harmonious state free from extremes of heat or cold.

Notably, the Kan trigram—externally Yin but internally Yang—contains Wu earth (Yang earth) as the reservoir of metal-water energy, governing the Yin Po and representing the gate of Daoist ethics. The Li trigram—internally Yin but externally Yang—contains Ji earth (Yin earth), governing the Yang Hun and embodying the substance of virtuous benevolence. Just as the moon's darkness becomes luminous through sunlight, practitioners must harmonize Yin-Yang to preserve physical and spiritual integrity.

This scripture primarily discusses the importance of Yin-Yang balance in spiritual cultivation. When the sun is above and the moon below, the moon temporarily blocks sunlight—symbolizing the waning of Yang Qi and the rising of Yin Qi. If practitioners fail to preserve their true Yang Qi, they will be eroded by Yin energies.

The crux of cultivation lies in the harmonious interaction of Yin and Yang: Just as the union of man and woman creates life, Metal (represented by the Dui trigram) can transform into Water (Kan trigram), but requires true Earth (spleen Earth) to regulate it, lest Water overflows. Men correspond to the Qian trigram, governing external expression; women to the Kun trigram, governing internal containment. Excessive dissipation of Yang Qi leads to domination by Yin energies—the Po (corporeal soul) belongs to Dui (Metal), while the Hun (ethereal soul) belongs to Zhen (Wood). Only through balanced coordination of Yin and Yang, as regular as seasonal transitions between cold and heat, can cultivation effects manifest.

The text warns that Yin-Yang imbalance resembles summer heat in winter or winter chill in summer—both stem from lack of moderation in practice. When Lü Dongbin (the Pure Yang Sage) studied alchemy with Zhongli Quan, his early efforts bore no fruit until receiving the Mirror for Entering the Medicine from Master Cui, which brought true enlightenment. Nowadays, some idly discuss Wuwei (non-action) while wasting precious time—a grave pitfall in cultivation.

Chapter 28 explains the Five Phases principle in alchemy: Cinnabar (symbolizing Fire) requires Metal's coordination, where Metal-Water unite and Wood-Fire accompany each other. The liver (Wood) manifests as blue (father), lungs (Metal) as white (mother), kidneys (Water) as black (child), heart (Fire) as red (daughter), and spleen (Earth) as yellow (ancestor). These Five Phases ultimately return to the central Wu-Ji Earth (spleen Earth), where the Three Treasures (Jing, Qi, and Shen) merge into oneness.

The most wondrous and precious elements within the human body are Jing (essence) and Qi (primordial energy). The Heart Seal Scripture (Xin Yin Jing) refers to them as supreme medicinal substances, while Zhang Ziyang (a renowned Song Dynasty Daoist) regarded them as life's treasures. This classic written by the Immortal Elder (referring to Wei Boyang, author of the Cantong Qi) shares common ground with other texts while presenting unique insights.

The shared principle is encapsulated in the phrase "When metal returns to its original nature, it becomes the Reverted Elixir (Huandan)"—the most concise fundamental truth. The distinctive features manifest through abundant metaphorical terminology: using Qian (Heaven) and Kun (Earth), Kan (Water) and Li (Fire) from the Bagua (Eight Trigrams) to symbolize Yin-Yang; employing "female and male" to represent opening and closing; along with concepts like being/non-being, Yin-Yang, sun/moon, primordial feminine (Yuanpin), Wu-Ji (earthly stems representing central direction), hardness/softness, and female/male polarities.

The text also employs numerous vivid analogies: the Northern Dipper's pivot (Dou Shu, Kuigang), sun/moon (crow and hare), mental activities (Hun and Po souls), golden Qi (primordial energy), divine consciousness (Yuanshen), yellow sprouts (embryonic elixir), the River Chariot (Zhoutian energy circulation), and alchemical ingredients like lead, silver, cinnabar, and mercury. Some terms describe meditative states (floating/sinking, black/white, primordial chaos, trance-like void), bodily locations (the central crucible, pivotal regions, empty non-spaces, obscure depths), mythological imagery (Perfected Beings, Great Abyss, celestial gates, Penglai Isles), and the Four Symbols (Vermilion Bird, Tortoise-Snake, White Tiger, Azure Dragon).

This profusion of terminology ultimately describes the essential components of internal cultivation. Some metaphors indicate gateways to practice, others denote focal points for spiritual concentration—whether referring to the cauldron furnace (the body's alchemical vessel), illustrating substance-function relationships, or using concrete imagery to depict the progression of cultivation. While the Book of Changes (Yijing) employs Qian and Kun's opening/closing to explain the gateways of life and death, internal alchemy (Neidan) uses the Magpie Bridge and Yellow Path (connecting the Governing and Conception Vessels) to symbolize energy pathways—both fundamentally describing the circulation of Jing and Qi within the human body.

The passage particularly mentions "When cinnabar's wood essence obtains metal, they unite," aligning with the earlier principle that "The sun's flowing pearls constantly seek to depart from humans, yet suddenly obtaining golden splendor transforms their mutual dependence." This means flowing pearls (Yuanshen), the maiden (Yuanjing), and cinnabar (heart-mind) belong to acquired Yin substances that cannot form the elixir alone. Only metal, yellow sprouts, and golden splendor—these primordial lead-mercury substances of pure Yang—constitute the essential materials for refining the Reverted Elixir.

This scripture employs the theory of mutual generation and restraint among the Five Phases (Wuxing) along with Yin-Yang principles to elucidate the mysteries of Qi (vital energy) and Jing (essence) circulation within the human body. It metaphorically describes the east (associated with the Heavenly Stems Jia and Yi) as the Wood phase, the "father of Fire" (since Wood generates Fire), while the south (linked to Bing and Ding) represents Fire as the "daughter of Wood," forming a Yang-within-Yin pairing. Conversely, the west (Geng and Xin) symbolizes the Metal phase as the "mother of Water" (Metal generates Water), and the north (Ren and Gui) embodies Water as the "child of Metal," creating a Yin-within-Yang combination. The liver corresponds to Wood, the lungs to Metal, the kidneys to Water, the heart to Fire, and the spleen to Earth—these five organs align with the Five Phases, with the spleen's Earth serving as the foundation for the other four.

The Dragon (Wood-Fire) and Tiger (Metal-Water) symbolize two vital energies within the body: the Azure Dragon (Qinglong) resides in the east, belonging to Yang and the number three, while the White Tiger (Baihu) dwells in the west, associated with Yin and the number four. When the Dragon emerges from Fire and the Tiger is born from Water, they require mediation through the central Earth phase (associated with the Heavenly Stems Wu and Ji) to harmonize and merge into unity. The second chapter specifically explains that when the Azure Dragon (Wood-Fire energy) moves westward and the White Tiger (Metal-Water energy) shifts eastward (i.e., crossing the Mao-You celestial positions), the opposing forces of "punishment" (destructive restraint) and "virtue" (generative growth) undergo mutual transformation. This mirrors how elm leaves wither in the second lunar month when the Big Dipper's handle points to the Mao position, while wheat sprouts flourish in the eighth month when the celestial Tian-Gang star occupies the You position—demonstrating the cyclical interplay of Yin and Yang energies along the north-south Zi-Wu axis (the "one-nine" numerical sequence signifies this cyclical alternation). Such a state of Dragon-Tiger convergence transforms internal energies from mutual restraint to mutual generation, achieving the cultivation effect of "sowing essence in the Zi position" (nurturing refined Jing in the Dantian).

This scripture elucidates the relationship between the mutual generation and restraint of Yin-Yang and the Five Phases (Wood, Fire, Earth, Metal, Water) in spiritual cultivation. Within the conceptual pair of "Xing-De" (Punishment-Virtue), "Xing" refers to the state of mutual restraint between Yin and Yang when the Five Phases follow their natural sequential order, while "De" denotes the harmonious union of Yin and Yang when the Five Phases are inverted (counteracting natural laws). Taking the hexagram of the second month with four Yang lines and two Yin lines as an example: though Yang energy grows, residual Yin persists—just as a robust adult, despite abundant Yang energy, may deplete vitality through excessive desires, leading to premature decline. Conversely, in the eighth month's hexagram of four Yin lines and two Yang lines, though Yin dominates, the remaining Yang energy—if refined through Golden Elixir (Jindan) practice (Daoist Neidan/internal alchemy)—can reverse aging.

The text employs the movement of the Big Dipper as a metaphor: in the second month at midnight (Zi hour), the Kuai star aligns with the Mao position (east) and the Gang star with the Si position (southeast), governing growth and belonging to "De." In the eighth month at dusk (Xu hour), the Gang star occupies the You position (west) and the Kuai star the Hai position (northwest), governing austerity and belonging to "Xing." The crux of cultivation lies in "inverting the Five Phases"—like swapping the Zi (north) and Wu (south) positions to achieve the harmonious union of water and fire (symbolized by the auspicious "Ji Ji" hexagram in the I Ching). As immortal sages taught: following the Five Phases' natural order traps one in the fiery pit of samsara, while inverting them refines the precious Golden Elixir. The progression of Yang energy from its initial spark (one) to its zenith (nine) encapsulates the essential principle of mastering the waxing and waning of Yin and Yang in cultivation.

This passage elucidates the core principles of alchemical cultivation, emphasizing the crucial importance of yin-yang harmony.

The text first explains the concept of the "one-nine cycle," referring to the cyclical pattern where yin and yang, upon reaching their extremes, begin anew. In Daoist Neidan (internal alchemy) practice, special significance is placed on the "Xu-Wei" celestial position (comprising the Xu and Wei lunar mansions among the twenty-eight constellations). This is considered the sacred junction where the sun and moon converge, the direction where yang qi first emerges, and the abode of the Black Tortoise (the mystical creature combining turtle and serpent). The primordial qi contained by the Great Unity deity (one of Daoism's supreme divinities) begins disseminating its essence during the zi hour (11 PM to 1 AM).

The scripture critiques those who merely understand surface-level practices like "mao-you purification" (a technical term referring to specific cultivation methods at certain hours) without grasping the profound implications of "punishment and virtue." Using seasonal changes as metaphor: when all things flourish in spring, elm seeds fall—demonstrating the need for vigilance against decay amidst vitality; when all things wither in autumn, shepherd's purse sprouts—revealing the presence of life within apparent desolation. The entire Cantongqi repeatedly stresses this central theme: obtaining primordial qi.

Later, the text employs the Book of Songs allusion of "Guanju" to illustrate yin-yang pairing: male birds never dwell alone, nor do females remain solitary. Just as the Black Tortoise consists of intertwined turtle and serpent, yin and yang must complement each other. Forcing two yin entities together resembles making two women cohabit—even with master persuaders like Su Qin or Zhang Yi as matchmakers, true union remains impossible.

The same principle applies to alchemy: with mismatched ingredients, even if the Yellow Emperor personally tended the furnace, Lord Taiyi controlled the fire, the Eight Immortals pounded herbs, the Prince of Huainan prepared compounds, built magnificent altars with jade steps, and offered rare sacrifices with devout prayers, it would be as absurd as patching pots with glue, treating sores with sulfur, reducing fever with ice, or cooling with boiling water—only worsening the situation.

The immortal Wei Boyang clearly states: refining the Golden Elixir requires properly matched yin-yang ingredients. Just as single yin and yang must mutually resonate, female and male must combine to generate life. With only singular properties or multiple yin elements lacking yang, the dynamic mechanism of perpetual transformation is lost.

This scripture expounds the core principles of cultivating the Golden Elixir (Jindan) path. To refine the Reverted Elixir (a supreme achievement in Daoist Neidan practice), one must obtain the Primordial Qi (Xiantian Yiqi) — the most fundamental energy of the cosmos. The author reveals that this text unveils the mysteries of cosmic creation, encompassing the laws by which Heaven (Qian) and Earth (Kun) nurture all beings, the principles governing the movements of sun and moon, and the profound mechanisms of Yin-Yang transformation. As the Book of Changes states, practitioners must align their virtue (De) with Heaven and Earth, resonate with the luminosity of sun and moon, harmonize with seasonal rhythms, and attune to the auspicious and inauspicious movements of spirits. Only sages truly comprehend these truths, and only divine beings can fully embody this practice.

The scripture particularly emphasizes its sacred nature: wherever this text resides, celestial deities of Heaven and Earth, the sun, moon, stars, thunder deities, and myriad spirits secretly protect it. Those with spiritual aptitude who devoutly recite it ten thousand times will have immortals (Xianzhen) descend to transmit the Great Dao. However, ignorant individuals who slander it will have their offenses recorded by spirits—suffering minor consequences like chronic illness or severe penalties like shortened lifespans, with their souls condemned to eternal suffering after death. The karmic retribution of good and evil is absolutely real.

The "Chapter on Sages' Refinement" in the latter volume details ancient cultivation methods: legendary sovereigns like Fuxi, Shennong, and the Yellow Emperor (Huangdi), all profound masters of Daoist mysteries, achieved bodily and spiritual transformation through Ninefold Golden Elixir refinement (the "nine cauldrons" represent nine Neidan stages), becoming invisible to ordinary perception. By nurturing spirit (Shen), absorbing the Three Lights' essence (sun, moon, and stellar energies), purifying bodily fluids, strengthening sinews and bones, dispelling pathogenic Qi, and preserving upright energy, they attained the immortal state of "shedding the mortal shell" through prolonged practice.

The author laments how later practitioners often focus on superficial techniques while neglecting fundamental principles. Some recorded cultivation methods but deliberately obscured crucial instructions, using convoluted terminology to conceal true meanings. Consequently, lifelong students never grasp the essence, oral transmissions between generations grow increasingly confused, officials neglect governance, farmers abandon fields, merchants discard goods, and aspirants impoverish their households. Deeply pained by this, the author resolves to present key practices in concise, systematic prose for discerning minds to contemplate.

Finally, the text notes that ancient sages like Fuxi, Shennong, and Huangdi left classics (like the 315-character original Yinfu Jing) containing authentic Dao transmissions. Sadly, later interpreters, lacking true understanding, distorted these texts through misguided explanations, causing the genuine Dao to become obscured.

Those who idly chatter about hundreds of sayings on cultivation, expound countless theories on methods, or deliver thousands of lectures on techniques are in truth like the deaf and blind who never grasp the essence—how could they possibly comprehend the great Dao of the sages?

The opening 120 characters of the Yinfu Jing ("Observing the Dao of Heaven") present the overarching principles of cultivation. The following 91 characters on "the theft of heaven, earth, and the myriad things" describe concrete cultivation methods, while the subsequent 104 characters on "the deaf being skilled listeners" reveal the key to success. Like the Yellow Emperor who ascended to heaven astride a dragon after refining the Nine Cauldrons of Great Elixir at Dinghu, the "elixir refinement" mentioned here does not refer to smelting metals or herbs, but rather to subduing the primordial Qi (the cosmic source energy in Daoist thought) to form the elixir—hence the term "subduing and refining" rather than "ingesting and refining."

Authentic subduing and refining comprises seven cultivation practices: embracing the mystery (internally preserving primordial Qi), holding fast to perfection (maintaining the Supreme Unity's true Qi), transforming traces (concealing one's tracks), hiding in obscurity (remaining deeply concealed), containing essence (condensing true mercury's essence), nourishing spirit (regulating the body's spiritual energy), and penetrating virtue (virtue resonating with heaven and earth). These seven constitute the "furnace fire" work—what we call "refining the self." Successful self-refinement causes the body's true Qi to circulate like furnace flames, generating warmth that produces abundant fluids, strengthens tendons and bones, dispels pathogenic energies, and preserves upright Qi.

Among these, "penetrating virtue through the Three Lights" (virtue resonating with the sun, moon, and stars) holds particular importance. Cultivating the Dao without cultivating virtue is like having yin without yang. Yet virtue cultivation must transcend mere lip service—those who claim virtue while lacking it harbor delusional thoughts. True practitioners, when their virtue runs deep, cease conscious pursuit of virtue yet naturally resonate with celestial spirits. Masters like Zhang Daoling, Ge Hong, and Xu Xun achieved this through authentic practice free from delusion—this is true "penetrating virtue through the Three Lights."

Only after refining the self and attaining virtue that moves heaven can one undertake great elixir refinement. The "fluids and interstices" mentioned refer to "jade fluids" (also called white snow) and "golden liquids" (yellow sprouts), which intermingle in the divine chamber (Dantian).

This passage explains how cultivation can strengthen the body, dispel negative energies, and preserve the innate Yang Qi (阳气) eternally, ultimately leading to immortality. The Yellow Emperor's refinement of the Nine-Cauldron Great Elixir (九鼎大丹)—a supreme alchemical medicine in ancient Neidan (内丹) practice—exemplifies this path of cultivation.

According to the Records of Celebrated Gatherings (Qinghui Lu), the Yellow Emperor (轩辕黄帝) first lived as a commoner, then as a minister, and finally as a ruler. Through benefiting the world and accumulating De (德, Virtue), he perfected his merits and ascended to immortality. Later sages followed this principle in various ways: King Wen of Zhou used the Book of Changes (Zhouyi) to elucidate the pivotal roles of Qian (Heaven, Yang) and Kun (Earth, Yin) in understanding the Yi Jing; Confucius, through the Ten Wings (Shi Yi), interpreted Qian's steadfast strength and Kun's yielding softness; Laozi, in the Daode Jing, expounded on the mutual generation of Being and Non-Being, as well as the Mysterious Feminine (玄牝), the root of all creation; Zisi, in the Doctrine of the Mean, described Heavenly Mandate as innate nature, and following this nature as the Dao; while Mencius taught methods to cultivate the Vast Righteous Qi (浩然之气), the supremely potent and upright energy. Each sage, through distinct approaches, guided later generations toward immortality.

Yet, fearing their teachings might be misunderstood, these sages often concealed essential truths—some revealed only fragments in their writings, others scattered profound meanings across texts using metaphors and coded terms. Even if later seekers with wisdom encountered these texts, without a true master's guidance, they could only lament their inability to grasp the teachings. Worse still, some practitioners copied the words without comprehending their essence, propagating errors and straying from the path—much like officials without connections, farmers without land, artisans with skills but no outlet, or merchants chasing profit while losing their foundation. Without oral transmission from a master, mere textual study leads nowhere, and wild speculation will never attain the Dao.

Out of compassion, the immortal master Wei Boyang (魏伯阳, revered as the "Immortal Elder") composed the Cantong Qi (参同契, The Seal of the Unity of the Three). Concise yet profound, this scripture illuminates the path for future cultivators.

This passage discusses the chapter structure and core philosophy of Zhouyi Cantongqi (The Kinship of the Three), a foundational text of alchemical practice. The book is divided into three sections: the upper section with fifteen chapters explains the transformations of Yin-Yang and the fundamental principles of alchemy; the middle section, also fifteen chapters, details the "fire times" (control of heating during alchemical processes) and precise measurements of ingredients; the lower section's five chapters uses cosmic patterns as metaphors for the successful completion of the elixir.

The author specifically warns later practitioners: these alchemical methods follow strict protocols and can only be mastered under the guidance of an enlightened teacher. The term "disordered verses" refers to deliberately obscure language concealing true meanings, while "hidden apertures" (Kongqiao) imply profound mysteries. These are methods for adepts to transcend calamities, like torches in darkness. Yet the ultimate truths of the Dao can only be grasped by sages—they must not be casually transmitted, lest the unworthy misuse them or trivialize the practice, leading to failure. Thus, wise seekers must study with utmost caution.

Chapter 32 employs cosmic motion to depict the elixir's completion: the grandest cosmic symbol is the ceaseless flow of rivers—just as the Milky Way astounds when arching across the sky, or solar eclipses portend famine (until sage-kings rectify imbalances). Rivers ebb and swell yet merge into the sea; Heaven and Earth alternate Yin-Yang at the Zi-Wu hours (midnight and noon), while Yin-Shen hours (dawn and dusk) mark their pivotal transitions. By aligning with the Big Dipper's rotation, one synchronizes with cosmic order.

In the alchemical process, ingredients must be "steamed" in the cauldron like rice: below, the White Tiger (symbolizing vapors from lead-mercury reactions) guides transformations, while above, the Vermilion Bird (flames) spirals and dances. When the compounds churn like trapped birds crying or infants clinging to their mother, the cauldron emits iridescent scales of light, liquids boil like rolling waves, and crystals interlace like icicles—until Yin and Yang fuse flawlessly into the serene Golden Elixir. The entire process mirrors stalactites forming naturally, with phenomena interweaving to achieve the supreme equilibrium of Yin-Yang.

This scripture primarily elucidates the principles and methods of Daoist Neidan (internal alchemy) cultivation, using natural metaphors to illustrate the practice process.

It first describes the operational patterns of three celestial creatures—the Azure Dragon, White Tiger, and Vermilion Bird (symbolizing different directions and energies)—in specific orientations and seasons. When these three energies converge, it resembles the harmonious reunion of family members. The foundation of cultivation lies in mastering the two qi (energies) of Yin-Yang (the two substances), which then evolve into the Five Phases (three-five), ultimately returning to unity.

Natural phenomena serve as metaphors: the vapors from mountains and marshes rise to form clouds and rain, dried earth transforms into dust, extinguished flames turn to ashes—just as yellow dye comes from the Amur cork tree and blue from indigo plants. Examples like leather boiled into glue and grains fermented into wine demonstrate how substances of the same kind readily transform into each other, revealing the key principle of cultivation.

Master Shangyangzi (an eminent Daoist adept) observes that the way of sages is both vast and subtle. The dialogue between the Yellow Emperor and Qibo states: "When jing (essence) and qi are insufficient, replenish them with food; when physical form is deficient, supplement it with qi." This principle unveils the mystery of the Golden Elixir. Sage-kings like King Wen of Zhou, Confucius, and Laozi each expounded the essentials of qi nourishment from different perspectives: the I Ching speaks of "gaining companions in the southwest" (indicating Yin-Yang union), Confucius teaches "like voices answer each other, like qi seeks its kind," while Laozi points to "the gateway of the Mysterious Feminine" (the source of life) as the root of heaven and earth.

The Cantongqi scripture meticulously records essential cultivation components: the medicinal substances (jing, qi, and shen), the crucible (the body), and the firing times (practice timing), emphasizing the vital importance of uniting with the golden qi (primordial energy). True practitioners must immerse themselves in cultivation as if diving into deep abysses—these teachings are both lucid and profoundly practical.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) practice, using cosmic Yin-Yang metaphors to reveal the mysteries of elixir refinement. The text employs "gold" to represent Qian's Yang Qi (heavenly vital energy) and "elixir" to signify Kun's Yin Jing (earthly essence), with their union necessary for forging the supreme Golden Elixir. The crux of cultivation lies in harmonizing Yin-Yang: the Tiger (metal Qi from the West) must emerge from water, while the Dragon (wood Qi from the East) must arise from fire, applying the Five Phases' generative cycle to unite lead and mercury.

Rich symbolism permeates the text: the White Tiger symbolizes metal essence, the Vermilion Bird represents firing times, and the Azure Dragon embodies wood nature. The alchemical process is likened to "cauldron boiling," where the medicine's bubbling signifies the flourishing of authentic Qi. When the Five Phases (wood, fire, earth, metal, water) become complete and Yin-Yang unite, a millet-sized Golden Elixir forms—as exquisitely subtle as the precious pearl suspended by the Celestial Worthy of Primordial Beginning.

Particular emphasis is placed on the "three-five unification" principle: the first being Kan's water (kidney essence), the second Li's fire (heart-mind Shen), combined with Five Phases harmonization. The entire process emphasizes spontaneous resonance, rejecting heterodox methods, insisting on alignment with nature's Yin-Yang transformations. The mentioned "female-male" refers to the Zi-Wu temporal nodes (midnight-noon), while "entry-exit" indicates the Yin-Shen directional orientations—all critical junctures requiring precise attention during cultivation.

This passage elucidates the core principles of refining the Golden Elixir (Jindan), the central practice of Daoist internal alchemy (Neidan). It begins by denouncing sexual cultivation techniques as heretical paths, emphasizing that authentic Golden Elixir practice resembles the mutual steaming of mountain and marsh Qi—requiring the harmonious interaction of Yin and Yang energies. Just as dry earth crumbles into dust, only when true Qi enters the alchemical cauldron (a metaphor for the body's energy centers, Dantian) can the elixir coalesce.

The text employs vivid analogies: Yellow dye comes from amur cork trees, green pigment from indigo plants; boiling animal hides produces glue, fermenting grains yields wine—likewise, obtaining the Golden Fluid (refined essence) inevitably leads to the perfected elixir. Matching compatible elements ensures success, like pairing Qian (Heaven) hexagram with Kun (Earth), or Zhen (Thunder) with Dui (Lake), creating balanced Yin-Yang cultivation. Mismatched pairings like Dui (Yin) with Xun (Wind) resemble two women cohabiting—how could such union generate transformative power?

These profound methods are no empty words. Like stars visible to all or rivers eternally flowing seaward, this scripture's truth remains immutable through millennia. Through devoted study and contemplation, divine illumination (Shenming) and spiritual awakening naturally arise. The sage's writings mirror cosmic cycles—the opening declaration "Qian and Kun are the gates of the Yijing" resonates with the closing admonition "Seek the origin by finding its gateway," embodying the Dao's cyclical nature. Heaven's law favors none but the virtuous; truth-seekers must reflect deeply.

Concerning the wondrous function of the cauldron-vessel (a metaphor for the body's alchemical apparatus): Its essence lies within the cultivation's symbolic system. While Peng Zhenyi suggested relocating these fragmented verses, this disregards their hidden profundity. The immortals' three-character metric verses follow esoteric patterns, particularly revealing the "Three-Five-One" mystery (the essential formula unifying Three Powers and Five Phases). Eleven chapters reference "Three-Five," like Chapter 24's "Three-Five harmony," Chapter 26's "Three-Five as heaven-earth's quintessence," or Chapter 32's "Without Three-Five interaction, hardness-softness separates." This chapter's opening line—"Round Three-Five, one inch one part"—reveals the cauldron's Three-Five mystery, the medicinal ingredients' (cultivation materials) one-inch authenticity, and the firing process's (timing) precision. The term "round" signifies complete mastery of this Three-Five-One formula.

This scripture elucidates the esoteric principle of "Three-Five-One" (sanwu yi), the core doctrine of Daoist Neidan (internal alchemy) practice. The term "Three-Five-One" refers to the sum of three numerical relationships within the Five Phases (Wood, Fire, Earth, Metal, Water): Eastern Wood (three) combined with Southern Fire (two) equals five; Northern Water (one) combined with Western Metal (four) also equals five; while Central Earth inherently embodies the number five. The convergence of these three sets of "five" constitutes the profound mystery of "Three-Five-One."

The text employs the generative and controlling cycles of the Five Phases to explain Neidan cultivation: Wood generates Fire (symbolized by the Azure Dragon and cinnabar), Metal generates Water (represented by female metal and dark water), while Earth (wuji) mediates at the center. Practitioners must comprehend the Yin-Yang transformations between these elements (Yang Wood in the Zhen trigram, Yin Fire in the Li trigram; Yin Metal in the Dui trigram, Yang Water in the Kan trigram). Through the application of the alchemical vessel (a metaphor for cultivation techniques), Jing (essence), Qi (vital energy), and Shen (spirit) coalesce to form the "infant" — an allegory for the internal elixir. This "infant" signifies the primordial Qi (original energy) latent within the human body, attainable only by those who truly grasp this principle to achieve immortality.

The author cites Confucius' Book of Changes ("interweaving its numbers") and Laozi's dictum ("in the depths of mystery lies the essence") to demonstrate how this principle aligns with cosmic operations. Ultimately, it emphasizes that the true alchemical vessel isn't physical dimensions but mastery over the subtle laws governing Five Phases interactions and Yin-Yang transformations. When the three sets of "five" perfectly merge (three and five become one), the Golden Elixir is forged — this constitutes the true meaning of "Three-Five-One."

This passage reveals the mysteries of refining the "Nine-Cycle Great Elixir" (Jiuhuan Dandan). The phrase "four-eight-two-inch lips" refers to the numerical sequence where four plus eight equals twelve, plus two makes fourteen - symbolizing the moon's initial phase of fullness in the heavens. The full moon represents pure Yang Qi (vital energy), and only in this state of pure Yang can the golden essence be nurtured within the alchemical cauldron. The "mouth" and "lips" symbolize the interactive gateway of metallic energies, corresponding to the cauldron's opening and rim. This embodies the profound principle of "two sevens making fourteen," which reflects the subtle mechanism of the "Seven-Return" process.

Most people fail to comprehend the immortal's deeper meaning, interpreting "mouth and lips" literally while obsessing over measuring the cauldron's physical dimensions. They don't realize the golden fluid elixir uses heaven and earth as its vessel. Attempting to measure the elixir cauldron's size would be like trying to measure the cosmos itself - an impossible endeavor.

True alchemical practice takes heaven and earth as the furnace and Yin-Yang as the fire. The human body constitutes a microcosm - using the physical form as the crucible and Jing-essence with Qi as the flame. This fundamentally differs from metal furnaces crafted from mineral ores.

The "twelve-inch length with uniform thickness" refers to the twelve months of the year. "Length" signifies the perpetual cycle of twelve monthly periods, while "uniform thickness" indicates the practitioner must maintain perfect balance in cultivation. An overly thick cauldron would prevent medicinal potency from penetrating, while excessive thinness would result in insufficient efficacy. Practitioners must recognize that each year's twelve months contain precise moments of metal-water mutual generation, requiring exact control of the firing process. Ancient sages condensed the seventy-two seasonal nodes of a year into a single day's cycle, grouping every six nodes into units regulated by rapid temporal shifts measured in fu (time units). Only flawless timing can produce the great elixir.

Regarding "the cauldron's belly aligns with three, sitting awaits descending warmth": the "belly" denotes the cauldron's interior; "aligns" indicates synchronization with lunar phases; "three" specifically refers to the third day of each month. "Sitting" means patient waiting, "descending" marks the arrival of the proper moment, and "warmth" signifies the stirring of Yang energy. The phrase "sharing radiance with the moon" references how the celestial moon (called Taiyin) first reveals its crescent in the Geng-Shen direction (west) at dusk on the third day of each lunar month, symbolizing the initial emergence of Yang energy.

This passage explains the principles of fire regulation (huohou) and Yin-Yang harmony in Daoist Neidan (internal alchemy) practice.

The Zhen trigram (one of the Eight Trigrams/Bagua) symbolizes faint Yang energy governing two layers of Yin energy, mirroring the alchemical cauldron's structure. In the human body, the lower Dantian (energy center) is called "lesser Yin" (Yin containing hidden Yang). Just as on the third night of each lunar month, a thread of Yang energy emerges in the northern Ren-Gui position (corresponding to the kidneys), resembling the Fu hexagram (one Yang line below five Yin lines). The term "sitting in warm repose" refers to practitioners locating their Dantian and meditating on these third nights, awaiting the arrival of the fire phase—that perfect moment of balanced warmth signaling Yang energy's awakening, the optimal time for alchemical work.

The text elaborates on Yin-Yang harmony: Yin (kidney water) above and Yang (heart fire) below resembles water and fire interacting within the cauldron. Water over fire forms the "Already Completed" hexagram (Jiji), while Yin above Yang creates the "Peace" hexagram (Tai). Master Ziyang (Northern Song Daoist Zhang Boduan) advised "let it be host while I remain guest," meaning to follow this natural Yin-Yang alignment.

Regarding fire regulation: begin and end with martial fire (intense heat), but use civil fire (gentle heat) in between. The initial seventy days are most challenging, while the final thirty days of nurturing require special care. These hundred days symbolize celestial completion. Typically, seven parts effort go to self-cultivation (lianji) with three parts nurturing. For a year of nurturing, three years of preparation are needed—yet the true alchemical process using civil fire lasts merely one shichen (two hours). The crux lies in proper timing. This critical alchemical moment exists outside the hundred-day framework; practitioners must grasp the deeper meaning of "beginning, end, start, and completion."

The text clarifies a common misconception: many assume cultivation requires three parts civil fire to seven parts martial fire, but alchemical scriptures (Danjing) often conceal deeper truths. True understanding reveals that the decisive moment ("the space of one talisman") is when the elixir manifests.

Finally, the mystery of Yin-Yang harmony: Earth's two generates fire, Heaven's seven forms cinnabar (heart fire)—one seven; Heaven's one generates water, Earth's six forms lead (kidney essence/Jing)—another seven. When lead (essence) and fire (spirit/Shen) unite, these two sevens converge, mutually assisting to achieve the Golden Elixir (Jindan).

This passage from the Zhouyi Cantong Qi explains the crucial steps and precautions in alchemical cultivation. During the elixir refinement process, one must harmonize lead and fire (alchemical terms representing Yin and Yang Qi) in the cauldron (alchemical furnace) using specific proportions (two sevens combining to make fourteen). This procedure assists practitioners in forging the Golden Elixir (Jindan).

Practitioners must maintain mental tranquility, allowing Jing (essence) and Qi (vital energy) to circulate naturally within the body. Just as an infant grows peacefully in the womb, cultivators should guard the central palace (Dantian) to prevent their Shen (spirit) and Qi from dissipating. Through prolonged practice, one's nature becomes purified, ultimately returning to the primordial source. The cultivation process requires the caution and reverence of a ruler and minister interacting. Completing one celestial cycle (a full Qi circulation) demands diligent effort, with constant vigilance to prevent spiritual distraction.

The path of cultivation is profound and far-reaching. Those who penetrate its mysteries become attuned to heaven and earth. Ingesting the Golden Elixir (a knife-point measure refers to minute doses) purifies the ethereal and earthly souls, granting longevity and immortal status. True devotees of the Dao investigate fundamental principles, precisely balancing ingredients according to the laws of the Five Phases (using the ancient weight unit zhu). These truths must be silently contemplated rather than idly discussed, and once genuine transmission is received, they should be deeply treasured rather than flaunted.

Practitioners who have obtained the elixir must never grow complacent but must persevere in refinement. When the Golden Elixir is perfected and the infant form (an internal alchemy term referring to the cultivated Yang spirit) gradually matures, one may advance to higher practices like the "Nine-Cycle Reverted Elixir" method. At the culmination of practice, one may ride cranes and dragons through the great void (cosmos), paying homage to immortal lords and receiving celestial registration as a Perfected Being (Zhenren).

These achievements are not unattainable—patriarchs like Laozi, Zhang Daoling, and Ge Hong all attained immortality through human cultivation, just as Śākyamuni and Bodhidharma achieved enlightenment. With resolute determination and courageous effort, all may accomplish great merit. Practitioners should deeply contemplate and diligently practice, never abandoning the path due to fear of difficulty or perceived lack of foundation.

A supplementary note clarifies that certain passages in the original Cantong Qi may have omissions, now rectified. It details the Five Phases correspondences: Yi Wood (floating right), Ding Fire (gentle fire), Si Earth (central palace), Xin Metal (worldly silver), and Gui Water (true lead)—these five positions harmonize. The generative numbers—three for Wood, two for Fire, five for Earth, four for Metal, and one for Water—correspond to firing temperatures and medicinal proportions in alchemical practice.

This passage elucidates the core principles and precautions of Daoist Neidan (internal alchemy) practice, divided into several key aspects:

First, it explains the principle of Five Phase correspondences: Yin-associated Jia Wood pairs with Yang-associated Bing Fire, while Wu Earth (representing the elixir) harmonizes with Geng Metal (mundane metal). Ren Water (true mercury, symbolizing primordial Jing-essence) also has its specific correspondences. Just as the Yijing (Book of Changes) describes Yin-Yang transformations and the teachings of the Yellow Emperor and Laozi explore natural laws, alchemical practice indeed has its profound foundations.

The three cultivation paths (of Jing-essence, Qi-energy, and Shen-spirit) originate from a single source, much like a tree's roots, stems, branches, leaves, and fruits all trace back to its root system. When winter brings dormancy to all things, practitioners should emulate merchants closing shop by conserving Yang energy, and rulers maintaining profound reserve. One must align with seasonal rhythms and practice careful speech, for the Dao of heaven is vast beyond description, and its mysteries transcend form. Misinterpretation or reckless discussion invites self-inflicted harm.

A crucial warning appears: this section contains vital oral instructions deliberately concealed. Commentators should grasp the implicit meaning, just as Confucius recognized cosmic destiny upon encountering the qilin. The text emphasizes "sealed lips" and "verbosity brings misfortune" as dual cautions. This scripture embodies supreme wisdom capable of protecting against venomous creatures and plagues, liberating from hell realms, and ascending directly to heavenly paradises. Sincere devotees may witness golden light manifestations and white radiance illuminating their chambers, with extended longevity as reward.

The author concludes with personal reflection: As a reclusive scholar from Kuaiji's wilderness, embracing simplicity without craving power or glory, I dwell in secluded tranquility, indifferent to fame. In quiet contemplation, I composed this work to elucidate the Yijing and the essential teachings of the Three Sages. Its purpose is to clarify cosmic principles, awaken spiritual luminosity, and perpetuate orthodox teachings. This treatise may serve as an eternal standard—applicable both in state governance and self-cultivation. The natural Dao of the Yellow Emperor and Laozi fundamentally involves accumulating profound De-virtue and returning to primordial origins. Truth resides within the heart, never departing the self; steadfast adherence to undivided purity brings longevity. Regarding methods like elixir ingestion, one must discern authenticity—rejecting the eight inferior minerals from Wudu (referring to crude Waidan/external alchemy) while carefully selecting genuinely efficacious materials.

(Note: "Eight minerals" refers to standard Waidan ingredients like cinnabar and realgar; "elixir ingestion" denotes consuming alchemical preparations; "masculine-feminine" signifies Yin-Yang energies)

This passage expounds the core principles and practical methods of Daoist cultivation. The text begins with a metaphor illustrating that although cultivation techniques may appear different ("three branches"), they all stem from the same fundamental principle ("emerging differently yet sharing one gate"). The author emphasizes these teachings are not empty words but genuine, practicable paths of cultivation.

The key to practice lies in relinquishing worldly attachments ("abandoning temporal harms"), retreating to mountain forests for dedicated practice ("dwelling amidst hills and valleys"), and through specific cultivation methods ultimately achieving the state of "transforming form to become immortal," enabling one to wander freely through the human realm even after countless lifetimes. The text mentions potential difficulties encountered during practice ("facing adversities like flood and drought"), yet with proper methods ("the auspicious find mutual support"), one attains longevity.

Master Shangyangzi (a renowned Daoist adept) further explains the essential points: The path to longevity lies in refining the Golden Elixir ("fire refines metal as foundation"), employing specific breathing techniques ("initially ingesting sixteen measures during crescent phases"), and consuming elixirs ("ingesting the refined substance") to return to one's primordial origin. He stresses that true cultivation requires abandoning ordinary herbal medicines ("plants differ in kind, metals and minerals must be discarded"), focusing instead on refining lead and mercury ("the mundane treasure this lead"), and through pure practice returning to nature.

The latter section describes marvelous phenomena after achieving cultivation: Practitioners may ascend to celestial realms ("reaching the Great Canopy's Jade Capital"), attaining various spiritual powers ("mud-pill palace radiating divine light"). It also mentions the merits of scripture recitation, with effects ranging from seven repetitions to ten thousand, ultimately enabling transcendence beyond rebirth cycles ("seed people beyond the form realm"), participation in celestial banquets ("golden boys scattering heavenly flowers, jade maidens holding jade feasts"), and standing among high-ranking immortals ("Great Purity floating with purple mist").

The entire passage integrates Neidan (internal alchemy) theory with religious sanctity, detailing both concrete cultivation methods and the transcendent states achieved through practice.