《悟真篇註釋》

The critical moment for cultivating the Golden Elixir (Neidan, the internal alchemy practice of refining essence, Qi, and spirit into an inner elixir) occurs at the beginning of the Mid-Autumn Festival, when Yang energy first stirs. The practitioner must sit upright with a tranquil mind, practicing upon a three-tiered altar. With the left hand controlling the "dragon" (referring to the mind-spirit), one regulates the firing process of elixir refinement; with the right hand controlling the "tiger" (referring to kidney essence), one adjusts the flow of Qi. These two forces—one Yin, one Yang—intermingle at the Mysterious Pass (a vital acupoint in the body), moving in and out of the Dantian (the lower abdominal energy center). Precise control of the breathing rhythm is essential, ensuring the Qi's movement aligns perfectly with celestial cycles without the slightest deviation. Practicing thus for a short while, through three cycles of Yin-Yang union, one achieves the effect of the Golden Elixir entering the mouth. This is what is called the "method of the strong army overcoming"—where "overcoming" refers to the union of Yin and Yang, and the "army" signifies the mind-spirit and kidney essence.

The Xihua Jing states that the key to this "strong army overcoming" practice lies in nurturing the "Mysterious Pearl" (another name for the Golden Elixir). Thus, the Immortal Elder (referring to Zhang Boduan, patriarch of the Southern Lineage of Daoism) first composed sixteen seven-character poems to elucidate the essentials of dragon-tiger union, followed by a five-character poem explaining the principle of forming the Golden Elixir within a single time period (two hours). This constitutes the core teaching of the first volume, clearly presenting both the theory of "strong army overcoming" and the methods for gathering and refining the Golden Elixir.

The following is the first of the fifteen seven-character poems:

Without seeking the great truth of the Dao to escape delusion,

Even the most talented cannot be called a true man.

A hundred years of life flicker like a spark struck from flint,

A lifetime’s journey is as fleeting as foam on water.

Those who covet wealth and chase glory,

Care not that their bodies waste away in exhaustion.

Tell me—can mountains of gold and silver,

Purchase even a moment of deathless life?

What the world values most is wealth and honor—these are what everyone desires. Thus, people exhaust themselves in pursuit, believing such things can fulfill life’s needs. Yet upon closer examination, obsession with fame, profit, and sensory pleasures actually harms one’s vitality, becoming shackles that bind body and mind. Why? Because people fail to understand the importance of cultivating De (Virtue) and the dual cultivation of nature and life. Instead, they greedily chase profit, indulge in anger and ignorance, and drown in desire. Their hearts are filled with contention and strife, emotional turmoil damages their health, shortening lifespans and hastening aging. Thus, they muddle through life in confusion, only for it to vanish in the blink of an eye.

Life is like foam upon water's surface, a fleeting century passing in an instant, or like sparks struck from stone - dazzling yet momentary. Even if you amass gold piled high as the Big Dipper, jade heaped mountain-high, when death comes, could such wealth preserve your body from being devoured by worms? Pitiful! Agonizing! Before this life ends, your soul may already be reborn in another form. Master Xujing (a Daoist perfected being) said: "Without awakening in this life, one drifts endlessly through the wheel of rebirth." Alas! Better to devote oneself to cultivating the Dao than be reborn as beasts. Those who succeed in Dao cultivation ascend to immortal realms, riding clouds and commanding dragons through the boundless void, eternally preserving their true selves to earn the title of "Zhenren" (Perfected Being). This is when a true great man fulfills his aspirations - his most joyous and glorious moment.

Yet those drowning in worldly affairs, shackled by mundane desires, though possessing the talents of Confucius and Mencius or the fame of Su Qin and Zhang Yi, become but wandering ghosts haunting graves, animated corpses - hardly worthy of being called true great men. Therefore, this Immortal Elder writes expressly to awaken those of exceptional wisdom: hearing these words should spur immediate pursuit of the Great Dao to escape delusion. Only those who practice wuwei (non-action) in accordance with nature are truly great. All other pursuits prove worthless.

Though human life spans a theoretical century, none can predict its actual length or fortune. Yesterday one might gallop through streets, today lie stiff in a coffin. Neither wife nor wealth follows, yet one's accumulated karmic burdens cling inexorably.

Lifespans and social stations are predestined - who can foresee them? Few live a full century; seventy years already counts as longevity. To exhaust this fragile, finite body chasing infinite desires - is this not exhausting labor? One missed breath brings eternal departure, the soul's destination unknown - is this not life's greatest sorrow? Thus the saying: "Yesterday riding horses, today a sleeping corpse" - between breaths, life and death hang uncertain. Then, neither exalted rank nor vast stipends, neither treasure-filled halls nor fairy-like concubines accompany you. All proves illusory. Only your lifetime's karmic debts follow - impossible to deceive or evade.

Throughout our lives, we remain trapped in worldly affairs like someone unknowingly dwelling in a burning house. When the breath suddenly ceases and the spirit scatters, no amount of weeping from family can call us back. However shrewd one may have been in life, in death we all become confused ghosts lying in desolate graves. How true this observation is!

To transcend the cycle of life and death and break free from worldly fetters, the supreme method is cultivating the Golden Elixir (the core practice of Daoist Neidan). The Great Dao of the Golden Elixir offers the swiftest path to celestial ascension - its methods are so straightforward that even dullards can achieve immortality by following them. Yet ancient immortals guarded this teaching jealously, transmitting it only orally to destined disciples, making it rare to encounter though easy to accomplish. Without sincere devotion that moves Heaven, few attain this Dao.

The Tang dynasty female adept Xie Ziran, failing to encounter authentic transmission, wholeheartedly sought the Penglai Immortal Isles. She exhausted her resources preparing a boat and braved stormy waves toward Penglai, her sincerity moving the Sea God who revealed: "Penglai lies beyond thirty thousand leagues of Weak Waters (mythical liquid that cannot float a feather). Your small vessel cannot cross. Seek out Sima Chengzhen (renowned Tang dynasty master) at Red Wall Mountain." Redirecting her course, Xie received true transmission and ascended within years. This proves perfect sincerity can commune with Heaven and Earth. Were all seekers this devoted, who could fail to refine the Golden Elixir? The Dao never fails people - people fail the Dao. As the Cantong Qi (Daoist classic) states: "The Great Dao makes no distinctions, only requiring genuine worthiness." Without sincere pursuit, how can one encounter true methods?

To receive but not practice the Golden Elixir secret represents supreme folly. Those encountering this transmission owe it to ancestral virtue and innate immortal destiny. Yet one still requires sufficient resources and three like-minded companions to begin practice - this principle is understood intuitively, not through explanation. Thus Wang Chongzhao, though learning the Golden Elixir method from Liu Haichan (famous Five Dynasties master), couldn't practice due to poverty.

Zhang Boduan (known as the Perfected Purple Yang) visited the two officials Han and Fu in Luoyang, attaining success in his Daoist cultivation with the support of influential figures before departing. If someone encounters such a method of practice and has the assistance of like-minded, capable companions yet refuses to cultivate, they are truly the height of foolishness. His poem to Fellow Daoist Liu states: "I hear you've known the elixir formula for years—why not calmly refine lead and mercury (referring to the foundational elements of Neidan/internal alchemy)? If you don't cultivate in time, it's like a candle extinguished by wind; when falling into the six realms of rebirth, don't blame heaven's will." This precisely warns practitioners to seize the moment.

The Dao of immortality has different levels: those with a nimble yin-spirit (soul) but no physical form are ghost immortals; those who live long in the human realm without illness or calamity are human immortals; those who ride clouds and mists, feel neither hunger nor thirst, remain unaffected by heat or cold, and wander immortal isles in eternal life are earth immortals. Only those whose form and spirit are both wondrously united with the Dao—who tread the sun and moon without casting shadows, pass through metal and stone unhindered, transform their shape at will, gather and disperse freely, and remain beyond the divination of turtle shells—are celestial immortals. The Perfected Yin Changsheng once said: Those who cultivate embryonic breathing (a breathing technique) through abstinence, whose spirit exits the body in meditative trance resembling death, belong to the lower grade of immortals; those who practice the Three Armor Talismans (Daoist incantations), the Supreme Unity Covenant Authority of the Shangqing tradition, and corpse-liberation techniques (methods of achieving immortality through spirit departure) may be ranked as middle-grade immortals in the grotto-heavens of the Southern Palace (a celestial realm). Only those who refine the Great Medicine of the Golden Elixir can ascend in their physical form as supreme celestial immortals of the highest, limitless grade.

Zhang Boduan urged cultivators to set lofty aspirations, sever worldly frivolities, and focus on the Dao of Wuwei (non-action). One should not be content with middle or lower grades of immortality but strive for the supreme state of celestial immortality. Among the seventy-two methods of elixir refinement, only the Great Dao of the Golden Elixir is the most direct and effective. This supreme path of creation from nothingness differs from the tangible materials of post-heaven metals and minerals (external alchemy ingredients) like cinnabar and mercury, nor is it the practice of refining one's own essence and blood (referring to the preliminary stages of Neidan). Rather, it must be grasped and refined when the "True One Qi" (the most primordial prenatal energy) emerges from the chaos of the primordial state.

This passage discusses the core concept of the "Golden Elixir" (Jindan) in Daoist Neidan (internal alchemy) practice. At advanced stages of cultivation, a millet-sized pill forms within the body—this is the Golden Elixir. It has numerous alternative names: True Lead, Yang Elixir, True Mercury, Essential Spirit of Oneness, Water of Oneness, Water-Fire, and the Supreme Unity's Contained True Qi. Consuming this Golden Elixir enables immediate transcendence beyond ordinary existence, representing the most profound method of immortal attainment, known to very few in this world.

The formation of the Golden Elixir follows the principle of Yin-Yang interaction. When True Yin (associated with Water) and True Yang (associated with Fire)—these two primordial energies—meet in the state of emptiness, they create a condition resembling the undifferentiated chaos before heaven and earth separated. Though invisible and intangible, they coalesce into the substantial Golden Elixir. The sages used concrete imagery to describe this abstract process: True Yin is likened to the White Tiger (representing western Metal Qi), while True Yang corresponds to the Azure Dragon (representing eastern Wood Qi). Their union resembles the convergence of the moon's waxing and waning phases.

The text provides numerous metaphors for these Yin-Yang energies. The Azure Dragon lineage includes over twenty designations like Crimson Dragon, Thunder Dragon, Celestial Hun, and Qian Position—all representing Yang essence. The White Tiger lineage similarly encompasses twenty-plus terms such as Black Tiger, Lake Tiger, Earthly Po, and Kun Position—all denoting Yin essence. These varied names ultimately describe the same fundamental principle, much like depicting the moon's phases from different perspectives.

The crux of cultivation lies in apprehending the "True Qi of Oneness"—the essential nature of primordial energy. In the Scripture of Limitless Salvation (Yuanshi Wuliang Duren Jing), this Qi is compared to a jewel suspended in emptiness: though tiny as a millet grain, it contains boundless vitality. Daoism employs such profuse metaphors both to safeguard esoteric teachings from casual disclosure and to help practitioners comprehend this profound mystery through multiple lenses.

This scripture elucidates the core concept of "Dragon-Tiger Copulation" (the union of Yin and Yang energies) in Daoist Neidan (internal alchemy) practice. Terms like "the sixteen-year-old maiden," "jade mushroom," and "wooden liquid" all refer to the same substance—mercury (representing the primordial spirit or Shen in alchemical terminology), which embodies the Yin principle. Conversely, "true lead," "metal lord," and "gold within water" denote the same substance—lead (representing the primordial essence or Jing in alchemical terminology), which embodies the Yang principle.

The Azure Dragon, associated with Wood and residing in the East, generates fiery Yang energy representing "passion" (Vermilion Bird). The White Tiger, associated with Metal and residing in the West, generates watery Yin energy representing "nature" (Black Tortoise). When these four manifestations—Dragon (Wood), Tiger (Metal), nature (Water), and passion (Fire)—converge at the central Earth element (Yellow Matron, representing the spleen), they forge the Golden Elixir. The essence of this elixir is Earth itself, completing the Five Phases (Wood, Fire, Earth, Metal, Water).

How can the Dragon in the East and Tiger in the West, separated by distance, unite? They require the mediation of the "Yellow Matron" (the central spleen Earth). Just as the left hand guides the Dragon and the right hand leads the Tiger, the Yellow Matron facilitates the union of Yin and Yang. Like a marriage needing a matchmaker, the Dragon-Tiger union depends on this intermediary. When the primordial Qi (original energy) resonates and condenses through this process, it forms the "Golden Liquid Returned Elixir" (the preliminary alchemical product).

After ingesting the Golden Elixir, one must undergo a nurturing process akin to ten months of pregnancy (refining form into Qi), followed by nine years of wall-facing meditation (embracing unity and maintaining centeredness). Only then can Qi transform into Shen (spirit), achieving the state where form and spirit become wondrously unified—merging with the Dao and ultimately ascending to the celestial realms astride phoenixes and cranes.

This cultivation method is supremely sacred yet remarkably simple. Zhang Boduan (styled Ziyang, also known as Perfected Lord Pingshu) noted in his Awakening to Reality: "Though many in the world cultivate the Dao, truly comprehending the Great Dao of the Golden Elixir may be limited to me alone." This reflects the core Daoist principle of "dual cultivation of nature and life" (Xingming Shuangxiu)—harmonizing Yin-Yang and refining Jing into Qi to attain longevity and spiritual transcendence.

How could small mounds and shallow puddles ever compare to the majestic grandeur of Mount Tai or the vast rivers and seas? Those who cultivate the Dao must understand that the principle of inverting Yin-Yang in spiritual practice originates from the transformations of the Li trigram (symbolizing fire, the south, outwardly Yang but inwardly Yin) and the Kan trigram (symbolizing water, the north, outwardly Yin but inwardly Yang). The Li trigram appears Yang yet contains the essence of Yin, called "true mercury" (a Neidan term referring to the original spirit, Yuanshen); the Kan trigram appears Yin yet harbors the energy of Yang, called "true lead" (a Neidan term referring to the original essence, Yuanjing). Just as the sun resides in the Li position yet belongs to Yin, and the moon is associated with the Kan palace yet belongs to Yang—if one cannot comprehend this principle of Yin-Yang inversion, they should refrain from reckless commentary.

This relationship is akin to the father's essence and mother's blood, the golden crow (sunbird) within the sun, the jade rabbit in the moon, the mercury within cinnabar, the silver within lead, or the celestial Yellow Male (Yang essence) and the earthly Mysterious Female (Yin essence). These metaphors all reveal the mystery of the "initial crescent energy" (the nascent state of Yin-Yang energies) in spiritual practice. The so-called host-guest relationship dictates that Yang, being noble, resides on the left as the host, while Yin, being humble, resides on the right as the guest. The Li trigram belongs to fire, whose nature ascends and aligns with the Yang quality of wood—it should naturally be the host. The Kan trigram belongs to water, whose nature descends and aligns with the Yin quality of metal—it should naturally be the guest. Yet the Dao of cultivation deliberately inverts convention: transforming the Li trigram into Yin and the Kan trigram into Yang, exchanging the positions of host and guest. This is precisely the profound mystery of alchemical practice.

The "golden cauldron" (referring to the lower Dantian) must retain the mercury (Yuanshen) within cinnabar, while the "jade pool" (referring to the upper Dantian) must first receive the lead (Yuanjing) resembling quicksilver. The golden cauldron is Yin yet contains Yang energy, like the White Tiger (the essence of western metal); the jade pool is Yang yet contains Yin energy, like the Azure Dragon (the liquid of eastern wood). If practitioners wish to use the White Tiger (Yuanjing) to attract the Azure Dragon (Yuanshen), they must first guide the spirit downward to unite with the essence. When the Yin and Yang energies harmonize and fuse, through specific methods of refinement, they naturally coalesce into the "true singular essence" (the Golden Elixir). But beware: fire modulation (the mindful regulation of intention during practice) is a secret method the sages rarely disclose—excessive fire ascends like soaring 84,000 li into the heavens, while insufficient fire sinks like plunging into the abyss of the North Pole. The sages master fire modulation to forge the Golden Elixir, but fools who misuse it invite calamity instead.

The wondrous practice of cultivating the True One's essence (primordial qi) does not require an entire day. When the practitioner employs the elixir fire (energy in Neidan practice), it resembles a crimson sun suddenly emerging from deep waters—this vision manifests in the briefest moment. The Zi hour (11 PM to 1 AM), when yang energy first stirs at midnight, is called "dawn." The sages' operation of elixir fire yields miraculous effects; within less than half a shichen (ancient two-hour unit), the True One's essence condenses into a millet-sized particle at the lower Dantian (North Sea), its radiance penetrating the body like that sudden sun over dark waters. This is no daylong labor, but an achievement of the Golden Elixir in a single moment—the very manifestation of the "external medicine" (primordial qi).

The verse describes the Golden Elixir (primordial qi) leaping like a fierce tiger while true qi (postnatal qi) soars like a coiling dragon, with internal energy surging like wind-whipped waves. The central position refers to the Dantian where the Golden Elixir coalesces, forming the Mysterious Pearl (another name for the elixir) as naturally as fruit ripens on branches or a fetus grows in the womb. Called "true lead" or "true earth," this elixir becomes "yang elixir" when ingested. The Golden Elixir originates from the prenatal realm like a mother, while one's own true qi arises postnatally like a child. When the external elixir enters, the body's qi surges upward from the lower Dantian (qi sea) like tidal waves to greet it—as subjects bow to their ruler or children cling to their mother. The dragon (true qi) and tiger (elixir) unite in the Dantian like fruit forming on boughs or a fetus maturing in the womb, culminating in ten lunar months of perfect gestation before natural transcendence.

Practice must align with the Zi-Wu hours (north-south axis), following Yin-Yang's cyclical patterns. The Zi hour (midnight) corresponds to the Zhun hexagram of six nascent yang lines—the time for "advancing fire" (strengthening yang). The Wu hour (noon) matches the Meng hexagram of six nascent yin lines—the moment for "introducing water" (nourishing yin). Daily qi movement flows from Zhun-Meng through Jiji-Weiji in endless revolution. The firing times (practice rhythms) of dawn, dusk, day and night must harmonize with celestial mechanics, turning hexagrams like pages to master Yin-Yang's transformations.

This passage elucidates the Neidan (internal alchemy) practice in Daoism that integrates the hexagram imagery from the Zhouyi (Book of Changes) with astronomical calendrics. The text cites the Cantongqi's method of "using the Zhun hexagram at dawn on the new moon and the Meng hexagram at dusk," indicating a daily cycle of two hexagrams—one for day and one for night—rotating sequentially. Over a month, this employs all sixty-four hexagrams, with their 384 lines (yao) corresponding to the days of a year (including intercalary months).

The calculation of lines in the Qian (Heaven) and Kun (Earth) hexagrams reveals profound symbolism: Qian's initial yang line (Chujiu) pairs with Kun's initial yin line (Chuliu). Each line of Qian represents 36 counting sticks (ancient divination stalks), totaling 216 for six lines; Kun's lines count 24 sticks each, summing to 144. Combined, they equal the celestial circle's 360 degrees, embodying how solar-lunar cycles and Yin-Yang interactions are encoded within hexagram transformations.

The text further deciphers the movement of the Celestial Pivot (the Big Dipper): it completes one daily rotation while shifting positions monthly—pointing to the Yin position in the first month, Mao in the second month, and so on. It details time determination via solar positions: if the sun hasn't entered the next lunar mansion, the Dipper pointing to You in the first month marks the Zi hour (midnight); if it has passed, pointing to Yin signifies the Wu hour (noon).

True Dao adepts perceive solar-lunar rhythms and Yin-Yang fluctuations, regulating their internal "fire times" (a Neidan term for breath control) according to Zi-Wu cycles (yang birth at Zi, yin birth at Wu). By aligning practice frequency with the Dipper's motion, they naturally harmonize with celestial patterns.

The author emphasizes that the Great Dao resides not in remote mountains but within worldly life, and the Golden Elixir (refined Jing-Qi) is innate to all. He critiques solitary practitioners who focus only on isolated meditation without understanding Yin-Yang balance, calling their enlightenment unlikely. Authentic cultivation can swiftly crystallize the inner elixir (described as a "millet-sized pearl" at initial formation); swallowing this transforms one's very essence.

Finally, the text underscores that refining "Yellow Sprouts" (kidney yang energy) and "White Snow" (heart yin fluids) hinges on profound De (virtue). The interplay of the Four Symbols (metal, wood, water, fire) and Five Phases relies on the central Earth element (the spleen's pivotal role in Neidan, emphasizing focused intention at the middle Dantian).

This scripture elucidates the core principles of Daoist Neidan (internal alchemy) practice. The essential Qi of the Dragon (symbolizing the Wood phase) is called "Yellow Sprout," while the essential Qi of the Tiger (symbolizing the Metal phase) is termed "White Snow." These two energies form the fundamental basis for refining the Golden Elixir (Jindan). Though the path of cultivation may appear simple, without profound accumulation of De (Virtue/Power), it is difficult to encounter a genuine master who can transmit its profound mysteries.

The universe originally emerged from emptiness, giving rise to the Primordial Qi (Xiantian Yiqi). This Primordial Qi divided into Yin and Yang, manifesting as the two attributes of Dragon (Wood generating Fire) and Tiger (Metal generating Water). When these four phases—Wood, Fire, Metal, and Water—combine with the central Earth phase, the Golden Elixir can be refined. The Earth phase has no fixed form yet permeates the four seasons and directions, serving as the foundational condition for the growth of all things.

Here, the term "Ren" represents Water, which is none other than the Primordial True One Qi (Zhen Yi Zhi Qi). This original energy existed even before the formation of Heaven and Earth and can transform into the Yang Dragon and Yin Tiger. The union of Dragon and Tiger forms the Golden Elixir, whose essence is the Earth phase. The three attributes—Metal, Wood, and Earth—are called the "Three Natures," corresponding to the Three Primordials (San Yuan) of Heaven, Earth, and Humanity. All of these originate from the transformation of the True One Qi.

The formation of the Bagua (Eight Trigrams) is also a result of the evolution of the True One Qi: through the interaction of Yin and Yang, the Qian (Heaven) and Kun (Earth) trigrams generate the three Yang trigrams—Zhen (Eldest Son), Kan (Middle Son), and Gen (Youngest Son)—and the three Yin trigrams—Xun (Eldest Daughter), Li (Middle Daughter), and Dui (Youngest Daughter). Since the creation of Heaven and Earth, all things with form and name have come into being through this unfolding of the True One Qi.

Master Zhen Yi (a realized adept) states: The True One Essence-Qi (Zhen Yi Jingqi) is the origin of all things in Heaven and Earth. It is the root of Yin and Yang, the foundation of Water and Fire, the principle governing the movements of the Sun and Moon, the source of the Three Powers (Heaven, Earth, and Humanity), and the progenitor of the Five Phases (Wood, Fire, Earth, Metal, Water). Whether it be the vast heavens and solid earth, sacred mountains and grotto-heavens, divine immortals and buddhas, or natural phenomena like wind, rain, darkness, and light—all rely on this True One Qi for their existence and transformation.

In the primordial chaos before the four seasons cycled and all things took form, all transformations originated from the pre-Heaven lead energy (referring to innate primordial essence). Those cultivating the Golden Elixir (Jindan) who obtain the Water of True Unity (pre-Heaven true Qi) may consider the foundation of Dao cultivation complete.

The perfected Golden Elixir spirit-body is imperceptible to ordinary people, yet it dispels the Yin energies within, preventing evil spirits from causing harm. When the millet-sized seed of True Unity (the nascent Golden Elixir) is gathered into the Dantian (energy center) and refined through the ten-month firing process (the Neidan cultivation cycle), all Yin impurities are purified, resulting in a body of pure Yang. At that stage, Yin demons and specters will find no place to hide. Yet even if one wished to transmit such secrets in the mortal world, finding a true understanding companion proves difficult.

To cultivate the Dao, one must first nurture virtuous roots. Only with deep virtuous roots can spiritual bones (the foundation of practice) be forged, and only with spiritual bones can the immortal path be realized. Such foundational accumulation is never the work of a single lifetime—it requires planting virtuous roots across countless kalpas before one may possess the transcendent bearing to rise above worldly dust. Those wandering charlatans with their bottles and bowls, putting on airs—how could they comprehend the true realm of immortals? Why not turn inward and reflect: Is their nature truly any different from ordinary mortals?

My path to immortality remains long, and I must broaden my heart-mind to penetrate the Great Dao (Da Dao). Even if the world mocks me as pedantic, I know within that I am no common soul. Huangjing and Chisong (ancient immortals) are my companions on the Dao, while Penglai, the immortal mountain (legendary paradise), is my homeland. When the time is ripe, I will surely encounter extraordinary beings who transmit the supreme Dao and meet fellow cultivators to refine the Golden Elixir together. Though an immortal elder may wish to leave true teachings in the human world, finding a true appreciator like Zhong Ziqi (a legendary connoisseur of music) is rare—where in this world could one find a genuine practitioner like me?

In seeking true lead (the medicinal ingredient of the Golden Elixir), one must concentrate wholeheartedly, wasting no time. Once the earthly soul (primordial essence) is subdued, the heavenly soul (primordial spirit) will naturally respond. Such a state may be called profound in Dao attainment—able to subdue dragons and tigers, and so virtuous that even ghosts and deities revere it. This true lead is none other than the Golden Elixir, transformed from the pre-Heaven single breath (Qi), as natural as the waxing and waning moon or the ebb and flow of tides. The earthly soul corresponds to the outer medicine, the White Tiger (essence), while the inner medicine is the Golden Elixir; the heavenly soul corresponds to the outer medicine, the Azure Dragon (spirit), while the inner medicine is one’s own vital essence. The metaphor of silver in water (symbolizing the harmony of Yin and Yang) precisely illustrates the relationship between inner and outer medicines.

Time flies, and with it, life dwindles—we must urgently seek out enlightened teachers and swiftly cultivate the Great Dao of the Golden Elixir.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) cultivation. The key to refining the Golden Elixir (Jindan) lies in harmonizing the two Qi (vital energies) of Yin and Yang within the body. The White Tiger (metal Qi, belonging to Yin) and Azure Dragon (wood Qi, belonging to Yang) must mutually regulate each other, for only through the union of these two energies can the Golden Elixir be produced. Once obtained, this elixir must then be used to refine the True Mercury (original spirit, Yuanshen) within the body, ultimately forming the Sacred Embryo (Yang spirit).

When the practitioner successfully subdues the internal Dragon and Tiger (the Yin-Yang energies), external distracting thoughts naturally subside. With the purification of the inner Shen (spirit), external Yin-based malevolent spirits will show reverence. Only those with profound De (virtue/power) can attain this state. At this stage, one achieves longevity matching heaven and earth, experiencing carefree liberation beyond worldly afflictions.

The scripture emphasizes avoiding attachment to Waidan (external alchemy) practices (where "three yellows" refer to sulfur, realgar, and orpiment; "four divinities" indicate cinnabar, mercury, lead, and silver - all mineral ingredients). These post-natal material substances cannot produce the pre-natal formless Golden Elixir. True cultivation requires seeking corresponding Yin-Yang elements (where "eight ounces of raven liver" symbolizes lead and "half-pound of hare marrow" represents mercury), allowing the Golden Elixir to emerge through their interaction.

The metaphor "red sun at pool's bottom" illustrates true Yang emerging from Yin (represented by lead), capable of dissolving Yin-based negativity; while "white moon on mountain peak" signifies true Yin born from Yang (represented by mercury). The sage refines these two substances during specific two-hour time periods to create a single Yang elixir, which dissolves bodily Yin energy like the morning sun. This Yang elixir gradually congeals from the lower Dantian (energy center), ultimately forming a body of pure Yang.

(Note: "Initial crescent Qi" refers to the most refined state of Yin-Yang energies; "Northern Sea" denotes the lower Dantian in the human body; "red lead and black mercury" are Neidan terms representing original Jing (essence) and original Shen (spirit) respectively.)

This passage elucidates the profound mysteries of "lead and mercury" (Neidan terminology symbolizing the yin and yang energies within the human body) and "dragon and tiger" (Azure Dragon and White Tiger, representing heart-mind and kidney qi) in Daoist internal alchemy (Neidan). Like tender sprouts and the crescent moon on the third day of the lunar month, which first receive the sun's radiance and reveal a faint eyebrow-shaped glow atop western mountains at sunset, these symbolize the nascent state of internal and external medicinal substances in Neidan practice.

The Xihua Jing states: The yin within yang is called the Charming Maiden (original spirit), while the yang within yin is called the Golden Lord (original essence) — these represent the symbolic union of yin and yang within the human body. Those who comprehend this truth find immortality within reach; those who don't remain separated as if by vast deserts of dust. True lead and mercury are not ordinary minerals, but the energy produced when dragon-tiger qi intermingles within the body. The internal authentic lead and mercury constitute the practitioner's genuine qi, capable of refining the Golden Elixir (Jindan). These two authentic substances can transform the tangible into the intangible, elevating one to true immortality — worldly lead and mercury pale in comparison.

The text employs striking metaphors to illustrate alchemical wonders: Just as men cannot naturally conceive children nor lotuses grow in fire, through the cultivation method of inverting yin-yang, these seeming impossibilities become attainable. The sun (Li trigram), though yang, contains yin; the moon (Kan trigram), though yin, contains yang — this state of inverted yin-yang generates the Golden Elixir. When this elixir transforms one's mercury (original spirit), it gestates the "infant" (yang spirit) — is this not akin to a man "conceiving"? Understanding this principle equates to growing lotuses in flames.

Finally, it explains harmonizing dragon-tiger qi: The White Tiger (original essence), though born of the Eastern Azure Dragon (original spirit), dwells in the West. Practitioners must guide the Tiger back to its Eastern homeland to unite with the Dragon, like joining husband and wife to ultimately conceive the pearl-like perfected Golden Elixir. This resembles the full moon's phase, where yin and yang achieve perfect harmony.

The method of cultivating the Golden Elixir (Jindan) follows celestial timing like observing lunar phases. First, one gathers the energy of the waxing moon (visible on the 7th and 8th lunar days), representing eight liang of Yang metal from the western crescent. Then one collects the waning moon (visible on the 22nd and 23rd lunar days), symbolizing half a jin of Yin water from the eastern crescent. When these two lunar energies merge, they form the perfect roundness of the full moon, completing the Golden Elixir.

The Great Elixir Fire Records states: A true spiritual elixir is no larger than a millet grain yet weighs a full jin. This metaphor of combining two eight-liang portions into one jin parallels Immortal Zhang Boduan's (Xianweng) teachings about lunar fullness, both symbolizing the process of external alchemy (Waidan). Upon ingesting this elixir, it transforms into the White Tiger (Western metal essence). This tiger energy is then guided inward to combine with the practitioner's mercury (heart fire). Through the harmonious regulation of Yin-Yang fire phases and the cyclical patterns of the sixty-four hexagrams, the golden liquid reverts to form the perfected elixir—weighing one jin like the full moon, representing the essence of internal alchemy (Neidan).

The full moon symbolizes internal alchemy because the sixty-four hexagrams of fire regulation contain exactly 384 lines (six lines per hexagram), corresponding to the ancient weight standard where one jin equaled 384 zhu grains. External alchemy's lunar symbolism derives from combining both crescent phases into wholeness. The Cantong Qi explains: "The waxing moon's Dui trigram number is eight, the waning moon's Gen trigram number is also eight—when these two crescents' essences unite, heaven and earth achieve completion." Zhen Yizi further clarifies: The two crescents represent the measurement of one jin, while the 384 lines correspond to fire phase calculations. Zhang Boduan's lunar analogy helps practitioners comprehend cosmic creation principles and distinguish between internal and external elixir theories.

The saying "watching the fire phases by the medicine furnace" doesn't refer to physical observation—the fire here isn't ordinary flame but the primordial Yin-Yang ancestral Qi (Zuqi), and the furnace isn't a material vessel. As Qingxiazi said: "The cauldron isn't made of metal, the furnace isn't for smelting." True cultivation occurs when the Li trigram (fire) below activates the Kan trigram (water) above, harmonizing spirit (Shen), breath (Qi), and intention until water and fire naturally balance. Gao Xiangxian elucidates further: Like heaven and earth coupling and Yin-Yang merging, the four phases and five elements (Wuxing) revolve spontaneously, day and night cycling like the alternating Zhun and Meng hexagrams—all must follow natural rhythms. When all turbid Yin energies dissipate, the Golden Elixir ripens naturally, granting transcendence beyond mortal dust.

This passage elucidates the essential principles of Daoist Neidan (internal alchemy) practice, focusing on several key aspects:

Regarding the "fire times" (the rhythmic regulation of breath and intention during cultivation), the text speaks not of ordinary furnace flames but of the body's innate natural energies. Practitioners must maintain mental tranquility, regulate respiration (the "civil fire" and "military fire" refer to the intensity of breathing patterns), and strictly observe temporal cycles. Within a double-hour period (approximately one hour), the elixir (Neidan) completes its coagulation, after which one must adjust the circulation of Yin and Yang energies according to the temporal changes, carefully guarding against deviations. After ten months of practice (Daoism uses the metaphor of ten-month gestation for the alchemical process), one completely sheds Yin impurities, achieves a body of pure Yang, transcends the mundane, and attains longevity.

The crux of cultivation lies in locating the source of "elixir production" (the emergence of internal alchemical energy), which originates in the southwest direction (the Kun position). In Daoist symbolism, the southwest represents the earth (Mother Kun), the birthplace of the White Tiger (Metal Qi), and the lunar ascension point. During the moon's first and third quarters (the 7th/8th and 22nd/23rd lunar days), when Metal and Water energies intermingle, this becomes the optimal time to gather the vital forces needed for practice.

The scripture particularly emphasizes the timing of energy collection: when the moon is full (signified by "lead appearing as Gui arises"), immediate action must be taken, whereas when the moon wanes ("metal encountering distant observation"), the opportune moment is lost. Such temporal precision requires oral transmission from master to disciple and cannot be grasped through textual study alone. Lu Sicheng, in his preface to the Wuzhen pian during the Song dynasty, noted how many mistook "lead" for "as if" and "metal" for "like," completely misinterpreting Zhang Boduan's profound meaning. Here, both metal and lead refer to the Golden Elixir (Neidan), which must be cultivated precisely during the Gui day's midnight hour—missing this window renders the effort futile.

The passage concludes with a caution: these esoteric techniques were meant for secret transmission, and their appearance in writing reflects necessity rather than choice. Like a precious pearl suspended fifty feet high, the size of a millet grain, it remains inaccessible to ordinary people. Many heterodox schools today mistake common elixirs for true lead and metal (misunderstanding the essence of Neidan), leading practitioners astray.

This scripture primarily critiques common misunderstandings of alchemical cultivation and expounds the essential method of harmonizing Yin-Yang and combining lead and mercury in the elixir refinement process.

The text points out that some practitioners treat statements like "Kun (the Earth trigram) receives Gui (the tenth Heavenly Stem)" as mere playthings—such misinterpretations arise from lacking proper guidance from a genuine master. The authentic practice involves: delivering the elixir to the lower Dantian (the Yellow Court earthen cauldron) and sealing it securely, then matching the "flowing pearls" (mercury) with lead to congeal the elixir into a spiritual embryo.

Regarding the phrase "the medicine weighs one jin (catty)," this actually refers to the balance of Yin and Yang Qi—eight liang (taels) of "raven's liver" (lead) and eight liang of "hare's marrow" (mercury), combining to make one jin. The text emphasizes that alchemy doesn't involve literal fire, but rather the harmonious application of Yin and Yang energies. All immortal scriptures agree that the foundation of the Golden Elixir lies in: following the generative principle of the Kun position (Yin) to plant the elixir in the Qian palace (Yang) where intercourse occurs. The entire mystery of cultivation is contained within the two characters "lead-fire," yet regrettably, many students remain confused about this.

Using plant growth as a metaphor for the Dao of Yin-Yang, the scripture explains: When plants first sprout, they contain pure, simple Qi—first producing a single stem representing the One Qi, then dividing into two leaves symbolizing Yin and Yang, followed by a bud corresponding to the Three Powers (heaven, earth and humanity). In spring and summer, Yang Qi makes plants grow leaves and blossoms, while in autumn and winter, Yin Qi brings fruiting and withering. This illustrates the natural rhythm of waxing and waning between the two Qi—a principle cultivators must thoroughly understand, lest they engage in forced practice without true comprehension.

This scripture elucidates the cultivation principle of Yin-Yang harmony and the mutual generation of the Five Phases. Yin Qi (the yin energy) and Yang Qi (the yang energy) must coexist in balance, interacting like manure nourishing plants. Without either element, all things would cease to grow. Master Zhenyi (a Daoist perfected being) states: "Solitary yin cannot develop itself, nor can solitary yang achieve anything independently." Only through the intercourse of Yin-Yang between heaven and earth can all things be conceived; only through the union of man and woman can life propagate. Ordinary people experience these natural patterns daily, yet remain unaware of the profound mystery of "True Unity" (Zhenyi) within—the arcane mechanism of Yin-Yang mutual transformation and cyclical recurrence, which is precisely the method to transcend life and death. Those who ridicule this principle without understanding it are in truth deluding themselves.

The numerical combination "Three-Five-One" conceals esoteric cultivation secrets. Eastern Wood (number three) combines with Southern Fire (number two) to make five; Northern Water (number one) combines with Western Metal (number four) to also make five; Central Earth (number five) itself is five. These three sets of Five Phases energies converge in the Dantian (the core cultivation area), like three families meeting, ultimately crystallizing into the "infant" (a metaphor for the internal elixir). The Yang Qi of the Dragon (associated with Wood, number three) transforms into Fire (number two), while the Yin Qi of the Tiger (associated with Metal, number four) transforms into Water (number one). These two energy groups unite in the Central Palace Earth (number five), forming a complete Five Phases cycle that eventually coalesces into the elixir. Since ancient times, those who comprehended this "Three-Five-One" mystery could achieve Neidan (internal alchemy), though such individuals are exceedingly rare.

The so-called "infant" refers to the purified Yang Qi (primordial energy) condensed within the body, which through a ten-month cultivation period akin to pregnancy establishes the foundation for sagehood. This "One" is another name for the internal elixir—it is both the primordial Qi of heaven and earth (Mother Qi) and the cultivator's innate original Qi (Child Qi). During practice, one should use the Mother Qi of heaven and earth to gather one's own original Qi, much like a mother cat holding her kitten, allowing the maternal and filial Qi to merge in the Dantian and ultimately form this "Great One" containing true Qi. Just as human gestation takes ten months, after completing the full cultivation cycle, the sacred embryo (sheng tai) will naturally be accomplished.

A final warning against cultivation errors: Practicing only yin without yang, or cultivating single aspects alone, is like a physically weak person forcibly exhausting themselves through acupressure—neither approach constitutes the true path. Those who merely refine Qi or ingest morning mist (a cultivation method of consuming cloud vapors) without understanding Yin-Yang harmony are arrogantly practicing blind cultivation. Authentic Daoist methods lie in grasping the fundamental principles of Yin-Yang mutual support and the intergenerational cycles of the Five Phases.

This passage elucidates the core principles of Neidan (internal alchemy) practice. It explains that while the yin essence within the human body (referring to vital substances like kidney Jing) is important, cultivating yin essence alone cannot lead to the attainment of the Dao. Just as cinnabar contains mercury and wood conceals fire's nature, yin essence tends to dissipate and is difficult to consolidate into form. It must be harmonized with the "Yang Elixir of Primordial Unity" (referring to the innate pure Yang Qi) to produce genuine transformation.

The author critiques various popular cultivation methods of the time—daoyin exercises, Qi ingestion techniques, and absorbing solar-lunar essences—considering them all partial practices that "cultivate only one substance." Like a hen attempting to hatch its own eggs unsuccessfully, solely cultivating yin energies (such as the seven yin substances: essence, blood, bodily fluids, etc.) can never attain the state of pure Yang. The text quotes Zhongli Quan (one of the Eight Immortals) saying, "How could these yin substances, taken as the foundation of the elixir, possibly enable celestial ascension?"

The explanation continues that not only is essence yin in nature, but all the internal organs are fundamentally yin. Therefore, common analogies comparing heart-kidney to Kan-Li, liver-lungs to dragon-tiger, or bodily fluids to mercury-lead are all mistaken. Seeking immortality through such methods is as absurd as using ice to melt frost or hot water to lower temperature. Quoting the Cantong Qi, the text states this approach resembles "making two women marry"—eternally incapable of producing offspring.

The passage concludes by revealing the true key to cultivation: "True Dragon and True Tiger" represent balanced yin-yang energies (each containing half of both), while "True Lead and True Mercury" signify the celestial essences during the moon's first and third quarters (8th and 23rd lunar days). The Dao's truth is supremely simple and near at hand, yet people persistently cling to heterodox methods. The genuine elixir must be sought from the origin of life itself—returning to the fundamental source constitutes the true path to immortality.

This passage elucidates the core principles of "true lead and true mercury" (zhenqian zhenhong, technical terms in Neidan referring to the essence of Yin and Yang Qi within the human body) in Daoist internal alchemy (Neidan), while critiquing erroneous cultivation methods.

The text first emphasizes that authentic practice must trace the origin of Yin and Yang Qi within the body. One must reverse-engineer the fundamental source from which human life originates. Only through this approach can the "true dragon and true tiger" (metaphors for Yin and Yang Qi) be naturally subdued, allowing the "true lead and true mercury" to find their proper alignment. This constitutes the genuine "king of medicines" (the supreme cultivation method). Contemporary practitioners who equate the "minor medicine of primordial chaos" (elementary cultivation techniques) with the Great Dao of the Golden Elixir (Jindan) are as misguided as attempting to reach the moon with a bamboo pole. All conditioned phenomena with form and substance belong to the post-heaven realm and cannot represent the highest medicine, as anything with physical form remains outside the pre-heaven Dao.

The text particularly stresses the importance of "true lead" (primordial Yang Qi), underscoring the necessity of maintaining Yin-Yang equilibrium (with the ratio of two-eighths as the guiding principle), while dismissing other approaches as futile labor. Several mistaken practices are criticized: some practitioners abandon marital relations to forcibly separate Yin and Yang, failing to understand that "solitary Yin cannot generate life"; others practice extreme fasting or grain avoidance, which may lead to rebirth as hungry ghosts after death; still others cling to herbal elixirs, metallic external alchemy (Waidan), or breathing and visualization techniques—how can these turbid, conditioned substances compare with the Great Dao of the Golden Elixir?

A five-character poem vividly illustrates the principle of Yin-Yang interaction: "The maiden wears indigo robes, the youth dons white silk." Here, the "maiden" represents the lunar breath of the dragon (Yin within Yang), associated with the Wood phase and born of the Azure Dragon, hence wearing indigo; the "youth" symbolizes the solar breath of the tiger (Yang within Yin), associated with the Metal phase and born of the White Tiger, thus clad in white. This employs the imagery of gendered attire to represent the characteristics of Yin and Yang energies.

The conclusion reveals the essential point: tangible substances (like external elixirs) are visible yet unusable, while the formless, pre-heaven primal Qi (the initial lunar and solar breaths), though invisible, constitutes the true foundation for cultivation. This underscores the Neidan principle of apprehending the formless pre-heaven Qi rather than clinging to conditioned phenomena with physical form.

In the trance-like state of meditation, practitioners encounter the primordial Qi (the fundamental energy that Daoism believes constitutes all things in the universe); within the profound depths of the mysterious void, wondrous transformations occur. The terms "trance-like" and "mysterious void" refer to the undifferentiated chaotic Qi before the separation of heaven and earth—it existed prior to the formation of the cosmos, profound and unfathomable.

The "substance" perceived in this seemingly existent yet intangible trance state is the crescent Qi (the energy of the nascent moon phase) when the Dragon (symbolizing Yang energy) first emerges. The "essence" (Jing) contained within the deep, obscure void is the crescent Qi when the Tiger (symbolizing Yin energy) first appears. These two crescent energies interact and resonate in the state of trance and void, where the Dragon and Tiger's Qi merge magnificently, causing the authentic One Qi to manifest miraculously—this is the process of form emerging from formlessness.

When the "fire timing" (the regulation of intention and breath in Neidan practice) reaches a critical moment, the Golden Elixir (the supreme achievement of internal alchemy) spontaneously manifests. This Golden Elixir is what the scriptures refer to as the "True Person." A realized adept compresses the seasonal energy transformations of an entire year into a single shichen (two-hour period), then divides this period into six phases, applying the fire timing only during two crucial phases. Through this, the authentic One Essence condenses into a grain-sized Golden Elixir that settles in the Dantian (the "Northern Sea" refers to the lower Dantian). Is this not a vivid depiction of the Golden Elixir manifesting at the precise moment when fire timing is perfected? Such profound cultivation methods cannot be mastered unless one receives oral transmission from a master.

The author, Zhang Boduan (Immortal Elder), points out: although the Golden Elixir is fundamentally transformed from the Taiji's primordial Qi, it cannot coalesce without the harmonious interaction of the Dragon and Tiger's Yin-Yang energies (the two crescent energies symbolize the balanced state of Yin and Yang). The Golden Elixir belongs to the Earth phase (central position in the Five Phases). The Dragon and Tiger energies, combined with the two crescent energies, form the Four Symbols (Lesser Yang, Greater Yang, Lesser Yin, Greater Yin). These Four Symbols converge in the Central Palace (the bodily region corresponding to the spleen-earth) to complete the cycle of the Five Phases. Laozi once said: "The Five Phases (Metal, Wood, Water, Fire, Earth) are the medicinal ingredients for alchemy, and the principles of the Four Symbols (the waxing and waning of Yin and Yang) must not be transgressed." It is precisely through the harmonious fusion of the Five Phases and Four Symbols that the Golden Elixir is ultimately refined. These five-character, four-line verses contain the profound mechanism of the Supreme One (the cosmic origin) harboring the authentic Qi.

This passage elucidates the fundamental principles of Daoist cultivation. The master Weng Yuanming explains that the cosmos originally emerged from emptiness as primordial Qi, which then divided into the two attributes of Yin and Yang. The purest Yang Qi ascended lightly to form heaven, while the purest Yin Qi descended heavily to form earth.

The key to attaining immortality lies in transforming one's vital energies: accumulating pure Yang Qi enables ascension to immortality, while accumulating pure Yin Qi leads to descent into ghostly existence. Ordinary people exist in a mixed state of Yin and Yang, capable of progressing toward either immortality or ghosthood. Through cultivation, when all Yin energy is completely transformed into pure Yang, one transcends ordinary existence to become a sage; conversely, if primordial Yang is depleted, the body becomes purely Yin and falls into the ghostly path.

Sages observed that humans, endowed with the refined Qi of heaven and earth, represent the most spiritually attuned existence. Thus by gathering the true Yin and Yang substances (referring to essential materials for cultivation) and obtaining innate primordial Qi, one refines the internal elixir (Neidan). Storing this elixir in the lower Dantian—the sea of energy—enables mastery over the body's acquired energies, much like all nations paying homage to their ruler or stars revolving around the North Star.

The human body originates from parental union, and cultivation involves "stealing" the essence of Yin and Yang as its foundation. Through the cyclical operation of "Yin talismans and Yang fire" (referring to two modes of energy circulation in practice), one completes within a single day-night cycle a microcosmic orbit simulating the sixty hexagrams, condensing 4,320 years of heaven-earth's righteous Qi into the Dantian. By nurturing the inner elixir ("child pearl") in the central palace (the body's core energy center), one forms a body of true spirit. After ten months of gestation-like cultivation, one ultimately undergoes complete transformation into a pure Yang body, no longer affected by hunger, thirst, or seasonal extremes.

The text concludes with a governing metaphor for self-cultivation: the state represents the human body, its people symbolize essence (Jing) and Qi. Just as people form a nation's foundation that must be stabilized for peace, so the body requires the inner elixir as its sovereign ruler, supported by the "fire phases" (energy regulation during practice) as ministers—only thus can one attain the harmonious state of body and mind.

This passage elucidates the core principles and practical methods of Daoist Neidan (internal alchemy) cultivation. It begins by drawing an analogy between refining the Golden Elixir (the supreme achievement of internal alchemy) and state governance: when the body's Jing (essence), Qi (vital energy), and Shen (spirit) harmoniously interact like ruler and ministers, this "small kingdom" of the body achieves prosperity and health—much like a well-governed peaceful realm. The Xihua Jing states that abundant essence and energy constitute "a wealthy nation and contented people," which can only be realized after Golden Elixir cultivation.

Immortal Elder Zhang Boduan composed 64 quatrains corresponding to the 64 hexagrams of the Yijing (Book of Changes) to clarify the principles of fire modulation (methods for regulating internal energy). He supplemented these with 12 Xijiangyue lyrics symbolizing the twelve-month cultivation cycle. Compiled as the middle scroll, these texts specifically explain how to achieve the goal of "a wealthy nation and contented people" through precise fire modulation.

Two quatrains are particularly noteworthy. The first declares that authentic Golden Elixir cultivation can be accomplished in a single day—an ancient truth attested by immortals. Claims requiring nine or three years merely delay progress. Here, "a single day" is metaphorical: it condenses a year's fire modulation into a month, a month's into a day, and a day's into a single shichen (two-hour period). When the Golden Elixir "enters the mouth" (successful cultivation), transcendence occurs immediately with instantaneous effects.

The second quatrains details the method: using Heaven and Earth (Qian-Kun) as the alchemical cauldron (cultivation space) and the sun-moon (crow-hare) as the medicinal ingredients (cultivation energy). Ancient sages regarded sun-moon as Heaven-Earth's essence, employing them respectively as cauldron and medicine. Here, Qian-Kun actually represents the True Dragon-Tiger (Yin-Yang energies), while the medicine is their quintessential Qi (crescent energy). Both cauldron and medicine are metaphors—the crux lies in merging the Dragon-Tiger's primordial crescent energies within the Central Palace's Yellow Path (core Dantian region) to coalesce into True Unity's essence (the purest life energy). As the Immortal Elder states: when these two return to the Yellow Path, how could the numinous elixir fail to form? The Yellow Path marks where central energy crystallizes.

This passage explains the core principle of "Kan-Li intercourse" (水火交媾) in Daoist Neidan (internal alchemy) practice. The Li trigram (离卦), symbolizing the heart's fire, appears yang externally but contains yin within, while the Kan trigram (坎卦), representing kidney water, appears yin externally yet harbors yang internally. During cultivation, the practitioner must extract the central yang line (the innate primordial Jing) from Kan and use it to transform the yin substance within Li, thereby converting Li into the pure yang Qian trigram (乾卦) and establishing the foundation for the Golden Elixir (金丹).

The term "Golden Mother" (金母) refers to the innate primordial Qi (先天元炁), also called "yang elixir" (阳丹), which resides within the kidney water (the "Northern Sea"). Practitioners must draw this energy from the central palace (Dantian) to transform the yin mercury (postnatal vital essence) in the body into pure yang substance. The entire process hinges on regulating the "fire times" (火候) through mindful intention—whether advancing, withdrawing, adding, or subtracting depends entirely on the cultivator's mental mastery.

Some mistakenly identify the turbid postnatal essence as the yang line within Kan, but this differs vastly from the true "great medicine" (大药) of the Golden Elixir (the innate primordial Qi). The Li and Kan trigrams must be harmonized through the "true intention of the central earth" (戊己土), otherwise, even with the presence of the Four Symbols (青龙, 白虎, 朱雀, 玄武), the elixir cannot coalesce. As the Cantongqi (参同契) states: the Ji earth (己土) in Li resembles a dragon's breath, while the Wu earth (戊土) in Kan resembles a tiger's essence—both share the same origin as true earth but reside separately in the dragon and tiger. Without this earthly qi mediating between them, how could the dragon and tiger merge the Four Symbols to form the Golden Elixir?

The text employs the metaphor of yin-yang inversion: the sun resides in Li but is paradoxically yin (the "Li maiden"), while the moon pairs with Kan yet is yang (the "Kan youth"). Those who fail to grasp this mystical inversion are like "viewing the sky through a bamboo tube"—their understanding remains shallow. Mercury (representing the spirit) originally belongs to Zhen's dragon (震龙) and the Wood phase, yet it emerges from Li's fire; lead (representing the primordial essence) belongs to Dui's tiger (兑虎) and the Metal phase, yet it arises from Kan's water. This illustrates the "child producing the mother" (儿产母) principle of reverse cultivation—ordinarily, Wood generates Fire, but in alchemical practice, Fire can regenerate Wood. As the Great White Immortal (太白真人) declared: "Through the art of inverting the Five Phases, the dragon emerges from fire." The key lies in returning the qi of all Five Phases to the central Wu-Ji earth (戊己土).

Water giving birth to metal follows natural logic, much like a mother nurturing her child. Yet in alchemical practice, black lead (representing the pre-Heaven true Qi of the Kan trigram) belongs to Water, yet produces silver (the refined essence within true lead), creating the paradoxical phenomenon of "the son giving birth to the mother." Thus the Wuzhen Pian states: "When the Five Phases move counter to their normal course, the tiger is born from water." Zhang Boduan (the Immortal Elder) deliberately emphasized lead being born from the Kan position rather than silver's generation, because the silver contained within lead constitutes the true essence, termed "true lead" or "silver within water." These two substances mutually engender each other, forming the Four Symbols (Great Yang, Great Yin, Lesser Yang, Lesser Yin), which converge in the central palace (Dantian) to complete the Five Phases. When the Five Phases achieve perfect fusion, the Golden Elixir can crystallize—hence the saying "All Five Phases must return to the center."

The trigrams originally served as metaphorical tools for illustrating alchemical principles, like bamboo fish traps that can be discarded once their meaning is grasped. Wei Boyang (Master Wei) discerned the correspondence between alchemy and the Yijing's principles, subsequently composing the Zhouyi Cantong Qi. He used Qian and Kun trigrams to symbolize the cauldron and furnace (alchemical vessels), while Kan and Li represented the medicinal substances (lead and mercury). Qian and Kun form the foundation of all trigrams, with Kan and Li containing their quintessence—these four central trigrams remain unmoving, just as the elixir gestates within the Dantian. The remaining sixty trigrams correspond to the monthly fire phasing cycle, progressing from Zhun and Meng to Jiji and Weiji, revolving like a wheel. Each day encompasses two trigrams, totaling sixty over thirty days, which—combined with the four primary trigrams—complete the sixty-four hexagrams and their 384 lines. This system mirrors both the annual solar cycle and secretly corresponds to the alchemical measure of one jin (sixteen taels) of the Golden Elixir equaling 384 zhu.

These trigrams merely aid comprehension of fire phasing—once truly understood, one need not cling to them. Regrettably, some practitioners nowadays obsess over trigram calculations, vainly studying their Qi fluctuations in hopes of ascension. This resembles clutching the fish trap while expecting to catch fish, fundamentally mistaking the means for the end.

Alas, people are like those who forget the fishing net after catching fish, or abandon the trap after snaring rabbits. Now they cling stubbornly to mere tools, drifting ever further from the true Dao.

Those who merely swallow saliva or inhale external Qi are merely skimming the surface. Authentic cultivation requires first possessing the "true seed" (primordial prenatal Qi) within—just as alchemy requires actual medicinal ingredients in the crucible. Otherwise, fiercely stoking an empty cauldron only wastes effort. What passes for Qi absorption in this world merely chases after postnatal, tangible things—this is not the true art of absorbing Qi.

True Qi absorption involves two stages: first subduing Qi, then absorbing it. Subduing Qi isn't mere breath-holding, but allowing the prenatal true Qi to naturally settle; absorbing Qi isn't forced breathing, but letting the primordial Qi grow spontaneously. This prenatal true Qi exists in the chaos of emptiness, imperceptible to ordinary people, but those who attain the Dao can subdue it through special methods. When this refined substance coalesces into an elixir in the Dantian (energy center), it can generate all things. Thus cultivation must begin with the "true seed"—otherwise all effort is wasted, like fiercely boiling an empty pot that soon ruins the vessel.

The roar of the male tiger on Huashan (symbolizing the western White Tiger) harmonizes with the song of the female dragon beneath the Fusang trees of the Eastern Sea (symbolizing the eastern Azure Dragon), mediated by the Yellow Matron (the central Spleen Earth), merging like husband and wife. Here the male tiger represents the string-Qi (yang within yin) in the Tiger Meridian, while the female dragon represents the string-Qi (yin within yang) in the Dragon Meridian. These two originally dwell separately in east and west—only through the Yellow Matron's mediation can they unite and conceive the Yellow Sprout (initial manifestation of the Golden Elixir).

When refining the Golden Elixir by balancing lead and mercury (water and fire), the key lies in yin-yang equilibrium. Activating the Dragon Meridian makes the fiery mercury-Qi ascend, while harnessing the Tiger Meridian makes the watery lead-light shimmer. When the prenatal Qi mechanisms naturally intermingle, how could there be any damage? This reveals the true meaning of "both great and small remain unharmed"—where the Dragon represents greatness (yang's nobility) and the Tiger represents smallness (yin's humility).

If you ask what true lead (the foundation of the Golden Elixir) truly is—it resembles moonlight perpetually illuminating the Western River (the kidney-water position). The Golden Elixir coalesces from the quintessence of gold and water, like waxing and waning moons. The toad-light (moonlight) belongs to yin, shining in mutual radiance with the sunlight.

This scripture discusses the fundamental principles of "lead and mercury" (metaphors for the body's yin and yang energies) and "yang essence" (primordial qi) in Daoist Neidan (internal alchemy) practice.

It begins by explaining the phenomenon occurring on the 15th day of the eighth lunar month when metal (gold) and water energies interact to form the "True One essence," likened to moonlight shining upon the Western River (symbolizing the metal phase). Here, "toad light" refers to moonlight, while "Western River" represents the metal phase.

The text then points out a common mistake in cultivation: practitioners fail to recognize genuine yang essence (primordial qi) and confuse the host-guest relationship (the hierarchy of internal and external yin-yang). Merely forcibly retaining sexual essence through bedroom techniques is like using firewood to extinguish a fire—counterproductive. Master Zhongli Quan (one of the Eight Immortals) taught that the four elements (earth, water, fire, wind) constituting the human body are all yin in nature, while only the "yang elixir" (primordial qi) represents supreme yang. One's internal qi is yin and serves as the host, yet the external yang elixir (primordial yang qi) can subdue internal yin mercury (acquired yin energy), causing the yang elixir to reverse roles and become host. Their union forms golden sand (the embryonic form of the Golden Elixir), which through proper fire phasing transforms into the golden liquid returning elixir.

The scripture emphasizes using "true lead" (primordial qi) rather than "common lead" (turbid acquired substance). As human essence and qi dissipate daily, true lead must be employed to gather and preserve them. During cultivation, lead (primordial) gradually decreases while mercury (acquired) increases. After ten months of gestation (the cultivation cycle) and six hundred hexagrams of fire phasing (celestial circulation), the lead qi fully disperses while mercury qi becomes purely yang, transforming into the great golden liquid returning elixir that achieves celestial longevity. Hence the saying "use lead without using it" (employ the primordial while abandoning the acquired) encapsulates the true secret of cultivation.

This passage elucidates the core Daoist cultivation principle of "supplementing like with like." To use everyday analogies: just as bamboo utensils must be repaired with bamboo, or eggs are needed to hatch chicks, the Golden Elixir (Jindan) can only be perfected by using the same type of vital essence (true lead) that exists within the human body.

The Daoist adept Tao Zhenren explains this clearly: split bamboo requires bamboo splints for mending, cracked wood needs wooden wedges for repair, a leaking roof demands tiles for patching, and the aging human body must be replenished with its corresponding primordial Qi. Violating this principle would be as futile as mending bamboo with metal or hatching eggs with stones. The Cantong Qi (a renowned alchemical classic) similarly emphasizes: only substances of the same kind can produce effects—no matter how exquisite, dissimilar materials prove useless.

The "true lead" mentioned here refers to the primordial Qi of heaven and earth—the most fundamental energy, which like a mother's pregnancy, requires corresponding substances for gestation. The essence (Jing) within the human body (child Qi) shares the same nature as true lead (mother Qi), enabling their mutual resonance. This reveals the profound mystery of the sages' cultivation practice: by gathering heaven and earth's primordial Qi (specifically the "two-eighths crescent-moon Qi") that corresponds to human vitality, they condense it in the void to form the Golden Elixir—a millet-sized point of light. Ingesting this transforms the mortal body into pure Yang substance, achieving longevity equal to heaven and earth.

The adept Chaoyuanzi states even more directly: although human life and death are subject to heaven and earth, the fundamental determinants of one's nature and life remain the mercury and lead (spirit and Qi) within oneself. Doesn't this precisely illustrate the principle that "my fate rests with me, not heaven"?

Finally, the text explains cosmic creation: from emptiness, the Dao generates primordial Qi. This single Qi differentiates into Yin and Yang, whose interaction produces the Three Powers (heaven, earth, and humanity), which in turn generate all things. All phenomena contain both Yin and Yang Qi, maintained in balance through harmonizing energy. This harmonized Yin-Yang energy exists even before physical forms manifest. Golden Elixir cultivation essentially reverses this generative process to return to the origin.

This scripture elucidates the core principles and process of Daoist Neidan (internal alchemy) practice, using metaphorical language to describe how Yin and Yang energies combine to form the Golden Elixir (central concept in internal alchemy cultivation).

When the primordial Qi first differentiates from formlessness, its light and clear aspects become Yang energy, while the heavy and turbid aspects become Yin energy. The Yang energy forms Heaven, symbolizing the father; the Yin energy forms Earth, symbolizing the mother. These two energies intermingle like the union of man and woman, ultimately giving rise to the Three Powers (heaven, earth and humanity). The sages, observing this natural law, comprehended the principle of returning to the origin. Through reverse cultivation methods that defy conventional logic, they refine the maternal energies of heaven and earth into the Golden Elixir, "stealing" the essence of Yin-Yang as the fire regulation in cultivation.

The passage "the snow mountain's exquisite ghee" employs metaphor to explain Golden Elixir cultivation: the snow mountain symbolizes the elixir itself, while ghee represents its refined essence. This elixir essence is guided into the Dantian (the lower abdominal energy center), where it's refined within the body's inner furnace to form the sacred embryo (an advanced energy body formed in higher cultivation stages).

The section referencing "passing northwest of Mount Kunlun" uses this sacred mountain as a metaphor for the lower Dantian. Kunlun's position in the sea symbolizes how the lower Dantian resides within the kidney water; its mysterious gate (heavenly gate) in the northwest Qian position represents the energy pathways during cultivation. The allusion to Zhang Qian meeting the immortal Magu illustrates the process where Yin and Yang energies (true mercury and true lead) meet and merge within the alchemical furnace.

The passage about "the maiden's wandering follows set patterns" reveals the precise regulation of cultivation fire. The maiden (mercury fire) moves according to specific rhythms: short advances followed by long withdrawals. This describes the concrete method of guiding internal Qi through conscious intention, emphasizing that Yin and Yang energies must combine in this particular manner to achieve the Great Dao of the Golden Elixir.

In the practice of Waidan (external alchemy, which employs medicinal aids), results manifest more quickly, whereas Neidan (internal alchemy, the cultivation of one's own Jing, Qi, and Shen) requires long-term perseverance. These two methods each follow their own principles of operation. Thus, in the initial stages of alchemical practice, sages employ the "mercury fire" (referring to the focus of mind and intention) to swiftly obtain the "True One Essence" (primordial Qi) in less than an hour, absorbing it immediately—this embodies the principle of "the preliminary phase must be brief." However, after ingesting the elixir, the refinement process using one's own Jing and Qi demands a prolonged gestation period akin to ten months of pregnancy—this is the meaning of "the subsequent phase must be extended."

When cultivation reaches fruition, the energy returns to the "Yellow Matron" (symbolizing the central palace of the spleen-earth, which harmonizes). This is likened to the union of the "Golden Lord" (True Lead, representing primordial essence) and "True Mercury" (the original spirit). Here, marriage serves as a metaphor: True Mercury, guided by external fire techniques, enters the "divine chamber" (Dantian) to merge with True Lead, ultimately transforming into a body of pure Yang. Hence the phrase "to wed the Golden Lord as an elder groom." The term "return" signifies the completion and perfection of the practice.

The application of fire techniques (the regulation of intention during cultivation) should resemble military strategy, divided into left and right flanks. The left represents "civil fire" (a gentle, sustained state of practice), while the right signifies "martial fire" (an intense, focused state of practice). Sages condense a year's worth of fire techniques into a single month and further compress a month's techniques into a single day. The six two-hour periods from Zi (midnight) to Si (late morning) belong to Yang, symbolizing the growth energy of spring and summer, with civil fire positioned on the left. The six periods from Wu (noon) to Hai (late night) belong to Yin, representing the gathering energy of autumn and winter, with martial fire positioned on the right. "Let him take the lead while I remain the guest" refers to maintaining a yielding, empty, and tranquil state—like a respectful and cautious guest who does not act forcefully. This mirrors the military strategy of "awaiting the exhausted with one's own vigor," where the practitioner holds the initiative without being driven by desires.

The key to applying fire techniques lies in the practitioner. Like a guest meeting a host, one must proceed and retreat with measured restraint, never acting recklessly. The cultivator must understand this: To employ fire techniques, one must first accurately grasp the timing, distinguishing the pivotal moments of Zi and Wu (the transitions between Yin and Yang). Next, one must harmonize Yin-Yang as the foundation for transformation. The cyclical changes of the 64 hexagrams correspond to the "Yin talisman" (the phase of contraction), while the 24 solar terms align with the "Yang fire" (the phase of expansion). A true master controls the pivotal mechanisms of heaven and earth—the "heavenly gate" (Baihui point at the crown) and the "earthly axis" (Huiyin point at the perineum)—as effortlessly as turning a door's hinge.

The key to cultivating Neidan (internal alchemy) lies in seizing the proper timing and harmonizing Yin-Yang. Just as the year unfolds through seventy-two seasonal nodes (known as the "seventy-two climatic periods"), the practitioner must gather these temporal essences into the Dantian (cauldron). It resembles the gathering of three thousand six hundred types of celestial and earthly vital energies (Zhengqi) to condense them into embryonic respiration. Each step must be meticulously followed—the slightest deviation can undo all progress, much like a military campaign where failure to maintain cautious defense (holding to the feminine) and reckless advance would lead to defeat.

Here, the White Tiger (representing lung-metal Qi) and the Azure Dragon (representing liver-wood Qi) serve as metaphors: when these two energies clash within the body, one must follow the method of Haichanzi (a patriarch of the Southern Daoist lineage), restraining the Azure Dragon with the "left hand" and subduing the White Tiger with the "right hand," ultimately merging them into a violet-golden Golden Elixir (gold within water). However, the phrase "using both hands to grasp two beasts" does not refer to literal hands but rather to the inner observation and breath-regulation techniques.

The text further employs lunar phases to illustrate the firing process in alchemy: the new moon (Hui), when the moon is completely dark on the thirtieth day, symbolizes the initial interaction of Yin and Yang. The first crescent moon (Geng Shang Emei) on the third day resembles the Zhen trigram (☳), where a single Yang line emerges—this marks the sprouting of the Golden Elixir. By the eighth day, the first-quarter moon (Dui trigram ☱) shows balanced Yin and Yang, akin to extracting eight taels of gold within water (half a pound of elixir material). At the full moon (Qian trigram ☰) on the fifteenth day, pure Yang dominates—here, the Golden Elixir takes preliminary form. The entire process resembles refining medicinal ingredients, requiring gentle, sustained heat.

This scripture elucidates the principles and methods of Daoist Neidan (internal alchemy) practice. It begins by explaining the process of Yin-Yang transformation: when the moon is fullest (on the 16th day), Yin energy begins to emerge, gradually waning like the Xun trigram (☴). By the 23rd day, Yin energy grows stronger, resembling the Gen trigram (☶), when Yin and Yang are equally balanced—a phase called the "last quarter moon." The period before this belongs to Yin while after belongs to Yang, and the energy produced during this equilibrium (water within metal) is most precious.

Practitioners must seize this opportune moment to guide the dual energies of Yin and Yang (two eighths) into the Dantian (cauldron of creation), refining them through precise fire regulation into "True Unity Qi." This process resembles cooking rice, eventually condensing into a Golden Elixir the size of a millet grain. Precise control of the firing process (Yin tally and Yang fire) is crucial—the slightest error leads to failure.

Next comes the concept of the "Five Thieves": manifested in heaven as the five planets, on earth as the five sacred mountains, and within the human body as the five organs—all representing the fundamental energies of the Five Phases. By comprehending this principle and practicing reverse cultivation (counterflow practice), one gains mastery over heaven and earth's energies. The body is likened to a nation: Jing (essence) and Qi are its people, fire regulation the ministers, and the Golden Elixir the sovereign ruler. Practitioners must subdue the "Five Thieves" and transform Yin-Yang to refine True Essence.

Finally, it discusses timing: the sun and moon meet once monthly, so practitioners should condense this monthly cycle into daily practice. One must understand the proper moments for "guarding the city" (quiet cultivation) and "open combat" (dynamic practice), ultimately filling the cauldron (Dantian) with spiritual medicine (Golden Elixir). The entire process requires a ten-month gestation period akin to pregnancy before achieving the alchemical rebirth into immortalhood.

This passage elucidates the crucial techniques of fire regulation in Daoist Neidan (internal alchemy) practice.

The metaphors of "talismanic fire" and "guarding the city while bathing" illustrate the need for steadfast stability like defending a fortress and purifying body-mind like ritual ablution, avoiding reckless advancement. "Dragon-tiger combat" symbolizes the harmonious interaction of Yin-Yang energies within the body. Practitioners must master the advancing and retreating of fire phases—if Yin-Yang becomes disordered or internal-external energies fall out of balance, even seemingly correct practice won't elicit true Qi response. Those who truly understand the Dao know when to "advance fire" (intensify practice) and "retreat water" (gather breath), aligning with celestial timing so the spiritual embryo (inner elixir) matures naturally and cultivation effects manifest.

The text notes the Yin Fu Jing contains over 300 characters and the Dao De Jing 5,000 words—yet these scriptures have guided all immortals throughout history to enlightenment. These two classics form the essential framework of Daoist texts and the key to comprehending all schools of thought.

The mid-autumn full moon marks the peak of Metal-Water Qi (representing kidney essence). When winter solstice brings the return of Yang at the midnight hour (Zi time), this optimal moment for practice must be seized—both Neidan and Waidan (external alchemy) fire phases must align precisely with this pivotal node.

Regarding the "Mysterious Feminine Gate" (the crucial energetic aperture), few truly understand it. Some mistakenly locate it at the mouth-nose or between the kidneys—all erroneous. Xuanpin (Mysterious Feminine) constitutes the root of Yin-Yang energies, the generative source of all creation. Without these two energies, nothing in existence could emerge. Both internal and external alchemy operate on this principle, which sages secretly termed the "Crescent Moon Furnace" and "Suspended Embryo Cauldron." The true Golden Elixir subdues internal mercury (mind-spirit) as effortlessly as a cat catches mice or an eagle seizes rabbits. Those who misidentify the mouth-nose as the Mysterious Feminine Gate will labor fruitlessly for millennia.

Finally, practitioners are reminded to comprehend life-death transformation. Ordinarily, aligning with Yin-Yang and the Five Phases brings life while defiance brings death. Yet true adepts understand that seemingly counterintuitive methods (reverse breathing, inverted microcosmic orbit) may yield longevity—this is the principle of "benefit born from harm," where life emerges from seemingly detrimental techniques.

This passage elucidates the crucial timing and principles in Daoist alchemical cultivation. When the moon appears half-full (on the eighth or twenty-third day of the lunar month), this moment is called the "One-Eight configuration." Practitioners must seize this special hour when the energy between heaven and earth is at its purest (like crystal-clear water), containing the formless primordial Qi (present in energy but without material substance).

Throughout the year, there exists only one specific day, and within that day only one precise two-hour window (known as the "golden period") most suitable for elixir refinement. This auspicious timeframe is further divided into six "hou" periods (approximately 20 minutes each). If cultivation is performed correctly within the first two hou, the Golden Elixir (Jindan) can take form. The remaining four hou periods have other esoteric applications—these are secretly transmitted techniques (heavenly secrets) requiring oral instruction from master to disciple.

The text criticizes Ye Wenshu for misunderstanding these principles and misinterpreting cultivation timing. True alchemical practice is profoundly simple—its essence lies in seizing this exact temporal window. Quoting the Southern Turtle's Record of Great Elixir Firing, it explains: When sages practice cultivation during this hour, they gather the quintessential energies of heaven-earth-sun-moon, yin-yang, and the Five Phases (stealing the Qi of the Three Primes' great celestial cycle) to refine a single supremely sacred Golden Elixir. Though small as a millet grain, this elixir weighs a full jin (symbolizing its energetic density), becoming the sovereign ruler of the practitioner's life.

The passage concludes with the metaphor "fire is born from wood" as a warning: cultivation must follow natural principles without forceful striving. Just as fire hidden within wood can cause disaster when extracted improperly through brute force, this emphasizes the paramount importance of harmonizing with celestial timing and natural laws.

This passage explains the principles of Yin-Yang harmonization and the Great Dao of the Golden Elixir (Jindan) in Daoist Neidan (internal alchemy) practice. The key term "Golden Duke" (Jingong) refers to the true Yang Qi within the human body, while "Yellow Sprout" (Huangya) denotes the primordial Qi generated during the initial stages of cultivation.

Practitioners must control the fire of desires, just as wood that generates fire may consume itself—human passions, when aroused, deplete Jing (essence) and Qi. Patriarch Lü (Lü Dongbin) advises guarding the "River Chariot" pathway (the Governing and Conception Vessels) like sealing a gate, with control relying on true Yang Qi (Golden Duke). The Can Tong Qi (Kinship of the Three) states one should use nascent Qi (Yellow Sprout) as the foundation for regulation.

The method of positioning the alchemical furnace (lower Dantian) and establishing the cauldron (upper Dantian) emulates celestial and terrestrial movements. Refining essence to subdue the Hun (ethereal soul) and Po (corporeal soul) mirrors how Yin and Yang energies interact to generate all things in nature. Though Heaven is pure Yang, it contains a trace of Yin that enables descent; though Earth is pure Yin, it holds a spark of Yang that permits ascent—their communion gives birth to creation. Similarly, Golden Elixir practice refines essence through furnace and cauldron, modeling Heaven-Earth's harmonious intercourse.

The Song of Mother and Child reveals true Yin-Yang union requires no external elixirs, as genuine Qi fusion transcends words. The Golden Elixir takes Qi as its root—emerging from emptiness, returning to non-being, cycling endlessly through transformations. These celestial secrets should not be lightly disclosed.

"Kanjian lightning" signifies the true fire (Yin talisman) concealed in kidney-water, also called the White Tiger's crescent Qi; the "Metal-Water quarter" denotes the northwest Qian position, symbolizing the Azure Dragon. The west houses Heaven's Gate (the Mysterious Portal). Here, the White Tiger employs Yin's fire to refine the Qian Dragon, prompting Kunlun's fire to respond. When twin flames unite, true essence spontaneously coalesces—collecting and ingesting this brings fragrant vitality throughout the body. As Can Tong Qi describes, when the Golden Elixir permeates, it spreads like mist through the five viscera, steams through the limbs, brightens the complexion, turns white hair black, renews lost teeth, restores youth to the aged, and transforms elderly women into maidens.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) practice. After ingesting elixirs, practitioners must employ the firing process (symbolic fire) of Yin-Yang interaction for refinement. Just as the tiger uses the fire within Yin to temper the Mysterious Pass (Xuanguan), and the dragon stirs the fire of true Yang from Kunlun (the crown of the head) in response, these two energies merge until the Golden Fluid Returned Elixir (the internal elixir) naturally matures, causing the entire body to emit extraordinary fragrance and radiant light.

The "Valley Spirit" (the innate primordial Shen in the Dantian) mentioned in the text can only achieve immortality by establishing its foundation through the "Mysterious Feminine" (the gateway of Yin-Yang union). When true gold (pure Yang Qi) returns to the golden chamber (Dantian), it forms an indestructible orb of light (the internal elixir). Like echoes in a valley, the spirit (Valley Spirit) and vital essence resonate with each other. Shen relies on Qi for existence, Qi is generated from Jing, Jing produces Qi, and Qi gives rise to Shen—these three mutually sustain life. To attain longevity, one must first establish this foundation through the Mysterious Feminine.

All things in heaven and earth originate from the interaction of Yin and Yang energies. Sages used this principle to achieve Waidan (external alchemy), while cultivators employ it to refine the "internal medicine" (inherent vital essence). When the true unitary Jing (primordial Qi) returns to the Dantian, it transforms into spiritual light, converting form into Qi, and Qi into Shen, ultimately reaching the sublime state where form and spirit become wondrously unified with the Dao.

The latter section discusses the principle of "mutual appropriation among the Three Powers" (heaven, earth, and humanity appropriating each other's energies): Heaven and earth appropriate the energies of all things through seasonal changes, causing flourishing and decay; all things appropriate human energy through the Five Flavors (various nutrients), resulting in life and death; humans appropriate the energies of all things through the Five Phases (Metal, Wood, Water, Fire, Earth), leading to creation and destruction. These threefold energy cycles constitute natural law, manifesting as complementary opposites—flourishing and decline, life and death, prosperity and decay. By comprehending the mysteries of these three cycles and returning to the source, one can attain the realm of immortals, achieving stability of body and mind, and realizing Wuwei (the state of natural harmony with the Dao).

This passage explains that Neidan (internal alchemy) cultivation must follow natural rhythms. Forcing practice against seasonal patterns disrupts bodily harmony; only by aligning with nature can one achieve mental and physical equilibrium.

The text employs hexagrams from the Yijing (Book of Changes) to elucidate "fire times" - the regulation of breath and intention in Neidan practice. The Zhun and Meng hexagrams represent the nascent states of Yin-Yang, mirroring the pivotal transitions at midnight (23:00-1:00) and noon (11:00-13:00) when daily cosmic energies shift. Sages synchronize their cultivation with the ascent and descent of heaven-earth energies and celestial movements, condensing the four seasons and twenty-four solar terms within their bodily "cauldron" to forge the "True Unity Form" (Golden Elixir). Though seemingly simple, this process cannot be approached haphazardly.

Specifically: During the spring equinox when Yang ascends into balance (represented by the Tai hexagram, resembling the waxing moon), and the autumn equinox when Yin descends into balance (represented by the Pi hexagram, resembling the waning moon), the natural blending of Yin-Yang energies occurs. Practitioners should pause "advancing the fire" (intentional guidance), entering a "bathing" period - a restorative phase in cultivation. The author emphasizes that mastering these four pivotal hexagrams (Zhun, Meng, Tai, Pi) suffices without overcomplicating other symbolic variations.

Ultimately, true cultivation manifests in daily life. The so-called "true lead and true mercury" (Neidan terminology for essential Jing, Qi, and Shen) actually reside within ordinary actions. Through "reverse cultivation" (the distinctive Neidan method of "inverting the Five Phases"), mundane phenomena transform into treasures. As ancient poetry observes: The truth surrounds you daily, yet remains unseen.

Note: "Bathing" denotes specific restorative phases in Neidan; "advancing the fire" refers to intensified intentional guidance; "reverse cultivation" describes the distinctive inverted practice method in internal alchemy.

The cycles of flourishing and decline between Heaven and Earth follow their own inherent patterns. Only those who understand the waxing and waning of Yin-Yang can comprehend these profound mysteries. The celestial stems Geng (metal) and Jia (wood) symbolize the growth and purification of Yang Qi. Only when Yin Qi (representing impurity) is completely eliminated can the Great Dao (the Way) be accomplished.

The cyclical pattern of Heaven and Earth's flourishing and decline operates as follows: The distance between Heaven and Earth spans 84,000 li. On the winter solstice, a thread of Yang Qi (primordial Qi) emerges from beneath the earth, rising daily by 460 li and 240 paces. Every five days constitutes a "hou" (small seasonal division), three hou form a "qi" (solar term), three qi make a "jie" (seasonal node), and two jie complete a "shi" (major season, such as the spring equinox). After ninety days, the Yang Qi ascends 42,000 li, reaching precisely the midpoint between Heaven and Earth. At this stage, Yin contains half of Yang, corresponding to the Tai hexagram in the Yijing (Book of Changes). The cold transforms into warmth, and all things begin to grow—this is spring.

Thereafter, Yang Qi continues rising to its pure Yang position. By the summer solstice—after a total of 180 days—it ascends the full 84,000 li to Heaven's zenith. Here pure Yang exists without Yin, corresponding to the Qian hexagram. The climate shifts from warm to hot, and all things reach peak flourishing—this is called "fullness" (ying). But at the apex of prosperity comes decline: on the summer solstice itself, a thread of Yin Qi descends from Heaven, falling daily by 460 li and 240 paces. After ninety days, Yin Qi descends 42,000 li to the midpoint between Heaven and Earth. Now Yang contains half of Yin, corresponding to the Pi hexagram. Heat transforms into coolness, and all things bear fruit—this is autumn.

Subsequently, Yin Qi continues descending. By the winter solstice—after another 180 days—it completes the full 84,000 li descent to the earth's depths. Here pure Yin exists without Yang, corresponding to the Kun hexagram. The climate shifts from cool to cold, and all things enter dormancy—this is called "emptiness" (xu). These cycles of flourishing and decline manifest visibly in lunar phases: the new moon first appears in the Geng position (west) on the third day, the first quarter moon forms in the Ding position by the eighth day, and the full moon reaches perfection in the Jia position on the fifteenth day (mirroring Heaven and Earth's peak fullness). From the sixteenth day, the waning moon begins in the Xin position, the last quarter appears in the Bing position by the twenty-third day, and the dark moon vanishes in the Yi position on the thirtieth day. The moon's waxing and waning thus serves as a direct reflection of cosmic energy transformations.

The movement of heaven and earth follows cycles of waxing and waning, and the sage (one who has attained the Dao) masters this rhythm of Yin-Yang transformation. Here, the lunar month serves as a microcosm of the annual solar cycle: the new moon corresponds to the winter solstice, with each two-and-a-half-day period divided into thirty time units representing a month's seasonal nodes.

At the third day, the crescent moon appears in the western Geng position (one of the celestial stems representing the west). By the eighth day, the first quarter moon emerges—Yin containing Yang (the half-moon)—mirroring the spring equinox. On the fifteenth day, Yang energy peaks like the fourth lunar month's solar term; the full moon symbolizes the plenitude of Yang, hence called "fullness" (ying). On this day, the moon rises from the eastern Jia position (the first celestial stem, representing the east).

From the sixteenth day, Yin energy begins to grow as the moon wanes, disappearing in the western Geng position like the summer solstice. The last quarter moon on the twenty-third day shows Yang containing Yin (the waning half-moon), akin to the autumn equinox. By the thirtieth day, Yin energy dominates like the tenth month's solar term—the moon vanishes entirely, called "emptiness" (xu). At dawn, it returns to the Jia position, reuniting with the sun to restart the cycle.

Practitioners must align their Neidan (internal alchemy) techniques with this cosmic rise and fall of Yin-Yang, mirroring the cyclical transformations of the sixty-four hexagrams. This cultivation is likened to a ruler issuing decrees—only by completely purging the body's turbid Yin (yin corpse) can one attain the Dao.

The text alludes to the legend of Ou Yezi (a master swordsmith of the Spring and Autumn period): by tempering metal with water at Ruoye Stream, balancing hardness and softness, he forged divine swords capable of slaying demons ten thousand miles away at their wielder's will. The sage refining the Golden Elixir follows the same principle—using heaven and earth as the furnace, Yin-Yang as water and fire, harmonized with the Qi of the Five Phases. The perfected elixir becomes both firm and yielding, transforming freely like a naturally formed divine blade. Without this "spiritual sword" (the Golden Elixir), the cultivator is like a hunter without tools. The author employs sword-forging as a metaphor for the elixir's ineffable mystery (xuanzhu wangxiang—the elusive numinous pearl).

The scripture states: "The nameless is the origin of heaven and earth; the named is the mother of all things" (from the Daodejing). These two appear distinct yet share the same source—few grasp this profound mechanism. Understanding this principle preserves life and destiny, revealing the Dao of waxing and waning. The Purple Golden Elixir (the supreme achievement of internal alchemy) thus embodies the ultimate marvel.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) practice. The "True Singular Qi" (primordial qi) is called "mercury" when in its formless state, representing the origin of heaven, earth, and all things. When manifesting in form, it's termed "lead," serving as the mother of all creation. Celestially, it corresponds to the Li trigram (associated with mercury), while terrestrially it relates to the Kan trigram (associated with lead) - sharing the same essence but differing in manifestation.

The crux of cultivation lies in mastering the mysteries of "diminishment" and "augmentation": following the natural sequence of the Five Phases (natural consumption) leads to the cycle of life and death, while reversing the Five Phases (through Neidan practice) can forge an eternal elixir body. The pure yang purple-gold (Golden Elixir) simultaneously embodies the origin of creation and generates all phenomena, thus being revered as the most miraculous elixir.

The essential method involves "emptying the heart and filling the belly": maintaining a mind clear of ego while replenishing the Dantian (energy center) with Jing (essence) and Qi (vital energy). Without first refining lead (stabilizing essence) to fortify the lower Dantian, merely pursuing mental emptiness will hinder Golden Elixir attainment. Authentic cultivation requires the abundant presence of the Three Treasures (Jing, Qi, and Shen), as precious as a hall filled with gold.

The practice involves both difficulty and ease, requiring both personal cultivation and celestial timing. Without accumulating De (virtue) through good deeds, practitioners risk demonic interference. The key techniques include: extracting true yang (elixir mother) from lead (kidney essence), condensing true yin (sacred embryo) from mercury (heart-mind Shen), and blending them within the Dantian crucible to form Taiyi's true qi (primordial breath). Precise control of the "fire phases" is crucial to coalesce the Three Treasures within the upper, middle, and lower Dantians, ultimately crystallizing the Golden Elixir that resonates with the Three Platforms constellation.

Note: In this context, "mercury" symbolizes heart-mind Shen while "lead" represents kidney Jing - specialized terminology in Neidan practice. "Three Fields" denote the upper, middle and lower Dantians. "Three Platforms" refer to the celestial constellation that mirrors the three Dantians in the human body.

This passage explains the principles of Yin-Yang harmonization in Daoist Neidan (internal alchemy) practice, using symbolic language to describe the cultivation process:

During practice, the "dragon" (symbolizing Yang Qi and represented by the Eldest Son in the Zhen trigram) unites with the "tiger" (symbolizing Yin Qi and represented by the Youngest Daughter in the Dui trigram). The western wine represents Metal Qi, while the northern flowers symbolize the refined essence (lead-fire) within Yin. When the dragon's mercury (Yang essence) meets the tiger's lead (Yin essence), they generate the True One essence in the "Yellow Chamber" (Huangting, the central energy field and crucial cultivation area in the body).

The mentioned "Crescent Moon Furnace" represents a Yin-aligned alchemical vessel containing Yang essence, while the "Cinnabar Cauldron" symbolizes a Yang-aligned container holding Yin essence. By carefully regulating the firing process of these Yin-Yang energies, one nurtures the sprout of the Golden Elixir, which eventually crystallizes into a millet-sized golden pill.

The subsequent reference to the Danjue (alchemical formula) from the "Pointing to the Mystery Treatise" teaches practitioners to recognize true Yin and true Yang, cultivating lead and mercury (the dual energies). At advanced stages, this practice leads to complete physical transformation—achieving an immortal state with "skin like ice and snow," capable of riding clouds and dragons through the heavens, unaffected even by cosmic changes like oceans turning to mulberry fields.

These teachings employ specialized Neidan terminology where dragons/tigers and lead/mercury symbolize Yin-Yang energies. Through specific cultivation methods that unite these forces, practitioners ultimately forge the Golden Elixir. Successful cultivation leads to longevity, transcendent vision, and the sacred state of surpassing ordinary human limitations.

This passage elucidates the essential principles and common misconceptions in Daoist Neidan (internal alchemy) practice.

It first emphasizes that practitioners shouldn't retreat to mountain seclusion before achieving the Reverted Elixir (the core accomplishment of internal alchemy cultivation). The true "lead" (referring to primordial Qi) isn't found in mountains but is inherently present within every individual—though ordinary people remain unaware of it. This underscores that authentic cultivation resources reside within oneself, eliminating the need for external seeking.

The text then explains that the crux of Neidan practice lies in mastering "fire timing" (the control of intention and timing during cultivation). Even with knowledge of cinnabar, black lead and other medicinal ingredients, failure to comprehend fire timing renders efforts futile. The Golden Elixir's refinement depends entirely on the "Golden Lord" (referring to true Yang Qi), where the slightest error leads to failure. Thus, ancient sages only transmitted knowledge of ingredients while guarding the secrets of fire timing.

The passage criticizes Ye Wenshu's erroneous identification of the "Crescent Moon Furnace" (a metaphor for the Dantian) as being located between the kidneys. The correct Crescent Moon Furnace refers to the "Northern Sea" (lower Dantian), shaped like an upturned crescent moon containing innate ancestral Qi and natural true fire—requiring no artificial fuel. This reinforces the principle of following nature's way in cultivation.

Finally, it describes the concrete phenomena during practice: When Yang Qi first stirs (the initial sign of cultivation), it resembles a hidden dragon emerging, requiring precise timing. At this stage, the "Lead Cauldron" (Dantian) naturally warms like firelight illuminating curtains. Practitioners must carefully regulate breath and intention, because while the initially obtained primordial Qi comes easily, the subsequent "extraction and replenishment" (fire timing adjustment) demands exceptional caution. Authentic lead (primordial Qi) exists within emptiness—at advanced stages, practitioners experience a spring-like warmth permeating their entire being.

This scripture elucidates several crucial points in the practice of Neidan (internal alchemy):

During cultivation, when Yin reaches its extreme it transforms into Yang. The key lies in seizing the opportune moment for "receiving Qi" (acquiring primordial energy). Improper handling during "adjusting the fire" (regulating the intensity) can easily lead to errors. One must carefully contemplate its profound subtleties while remaining constantly vigilant against potential dangers. Just as a sword cuts through demons, cultivation requires mastering the harmonization of Yin-Yang.

Neidan practice resembles the gradual formation of the Mysterious Pearl (a metaphor for the Golden Elixir). Beginning with "advancing the Yang fire" (strengthening Yang energy) at the winter solstice when Yang first emerges, then transitioning to "advancing the Yin tally" (regulating Yin energy) at the summer solstice when Yin appears, the elixir matures through ten months of frost-like refinement. At this stage, even spirits and deities will be astonished.

Particular attention must be paid to two critical periods: the second lunar month (Rabbit Month) and the eighth lunar month (Rooster Month). The second month favors gentle nurturing (De/Virtue), while the eighth requires restraint (disciplinary measures). During these times, the practitioner should cease using fire, or risk undoing previous achievements.

Although the scripture contains six hundred chapters about fire regulation, the true secrets aren't written in words. Even brilliant minds like Yan Hui and Min Ziqian couldn't comprehend them without guidance from an enlightened master. Ten thousand volumes of alchemical texts merely point the direction—the core teachings require heart-to-heart transmission between master and disciple.

Cultivating the Golden Elixir is like sowing seeds in one's own garden, requiring no artificial effort. With proper methods, the elixir forms naturally like ripening fruit. When the Five Phases' energies (five directions) harmonize and the Four Symbols (young and mature Yin-Yang) converge, the elixir's completion manifests as purple radiance enveloping the body. This marks the attainment of transcendental sagehood—a transformation so profound it would make even guardian dragon spirits marvel in awe.

This scripture expounds the core principles and practical methods of Daoist Neidan (internal alchemy) cultivation. It begins by describing how the Five Phases (Wood, Fire, Earth, Metal, Water) and Four Symbols (Azure Dragon, White Tiger, Vermilion Bird, Black Tortoise) energies converge within the practitioner's body to form the "True Singular Mysterious Body" - a luminous purple essence resembling millet grains in size. At this stage, the practitioner must guide the "Crimson Dragon" (the Qi of heart fire) with focused intention to ingest this essence into the Dantian (lower abdominal energy center), thereby attaining divine states of consciousness.

The text then employs alchemical metaphors to explain key cultivation techniques: "Metal Lord" (lead, representing primordial Qi) originally belongs to the East but temporarily resides in the West, and must be recalled to unite with the "Charming Maiden" (mercury, representing the spirit). This process involves harmonizing internal and external medicines - the internal medicines being the body's Yin-Yang energies and the external medicines being celestial and terrestrial Qi. The three internal natures (Jing/essence, Qi/vital energy, Shen/spirit) must balance with their three external counterparts. The alchemical process entails repeated Yin-Yang transformations that transcend verbal description, requiring personal realization through practice.

Later passages invoke the Daode Jing's concept of "returning to the root and recovering one's original nature," illustrating how cultivation aims to revert to the primordial state. Before birth, humans exist in a state of undifferentiated purity; after birth, they become subject to Yin-Yang influences. Neidan practice reverses this process by retrieving the primordial Qi as the foundation for the elixir, progressing through three stages: refining form, refining Qi, and refining spirit - ultimately achieving unity with the Dao. Those who understand this eternal principle attain longevity, while ignorant actions lead to misfortune.

The text concludes with specific cultivation methods: the "Crimson Dragon" (heart fire) must unite with the "Black Tiger" (kidney water) at the central Earth position (spleen/stomach region), mirroring the convergence of Eastern Wood and Western Metal energies. Here, the "Charming Maiden" (heart-mind) and "Metal Lord" (kidney Qi) resemble mercury within cinnabar and silver within black lead - fundamentally one substance. Through this natural copulation, the Golden Elixir (elixir of immortality) is forged.

This scripture elucidates the key stages and principles of Neidan (internal alchemy) practice. The primordial Qi of the "Red Dragon" (heart fire) and "Black Tiger" (kidney water) converge within the body, much like the energies of the four cardinal directions merging. When the Four Symbols (metal, wood, water, fire) blend within the central earth position (represented by the Wuji axis), they crystallize into a golden elixir no larger than a millet grain, returning to the Dantian (the lower abdominal energy center).

The practice begins during the Fu hexagram (midnight, when yang first emerges), advancing the yang fire, then shifts to the Gou hexagram (noon, when yin first appears) to withdraw the yin talisman. These two hexagrams mark the pivotal transitions of winter and summer solstices, initiating the celestial cycle's fire regulation.

Forging the Golden Elixir requires impeccable timing: one must diligently cultivate before its completion, yet practice restraint once achieved. Overzealous advancement invites failure, as immortal Zhongli Quan warned: "When the elixir matures, further firing harms it." Like Bodhidharma's nine-year wall-gazing austerity, sincere devotion leads to Dao-realization.

Many mistakenly elevate Buddhist xing (mind cultivation) while disparaging Daoist ming (physical refinement). True practice unfolds in three phases: initial "intentional action" transforms the physical form through external elixirs; intermediate "deliberate effort" refines form into Qi; final "Wuwei (non-action)" merges with the Dao. At the pinnacle, form and spirit both transcend appearances—here, nature and life are inseparable. Arbitrarily dividing spiritual and physical cultivation reflects partial understanding. The complete path progresses from tangible practice to formless non-action, a profound truth beyond ordinary comprehension. Master Zhang Boduan composed this verse to guide practitioners through these holistic stages.

Practitioners often focus solely on the profound mystery of "Wuwei" (non-action), failing to realize that "youwei" (deliberate practice) forms the foundation for attaining true non-action. Just as a fisherman needs tools to catch fish yet abandons his boat after crossing the river, spiritual cultivation resembles the ten-month gestation period where ordinary people and sages mingle in the mundane world like fish and dragons swimming through marketplaces—human suffering stems from missing the truth when it stands before us.

The method of "observing form, regulating qi, and concentrating shen" (visualizing the body, controlling breath to gather spiritual awareness) proves extremely challenging at first. Yet with mastery, practitioners achieve unimpeded flow—their consciousness traversing myriad realms in an instant. This demonstrates the numinous agility of the yin-spirit (the subtle spiritual body). However, being yin in nature, this spirit tends toward decay and instability, ultimately requiring rebirth through "seizing habitation" (taking over another's body).

These four rebirth methods—natural rebirth, forced habitation, relocation, and abiding in previous dwellings—constitute the "Four Fruits of Practice." All belong to the realm of ghostly immortality achieved through yin-spirit cultivation, not the true immortality of yang-spirit attainment. By subduing the heart's fire (dragon) and taming the kidney's water (tiger) to forge the Golden Elixir, one transforms form into formlessness, achieving yang-spirit immortality where body and spirit merge wondrously with the Dao—an eternal state far surpassing yin-spirit achievements. Thus Master Cui warned: "When radiant awareness descends into darkness, death makes one a benevolent shade in the underworld."

Though Buddhism teaches cultivation of the Pure Land, ultimate bliss actually corresponds to the golden-natured realm. Most practitioners cling to form, unaware that only the Golden Elixir path embodies ultimate truth—the other two (yin-spirit and Pure Land) remain provisional. Contemporary teachings on Buddha-recitation for rebirth in paradise merely establish expedient methods for mediocre practitioners, becoming obstacles for those of superior capacity. They overlook how the true Pure Land lies not far to the west, yielding genuine gold (the Elixir)—a millet-sized grain weighing sixteen taels. Buddhism's "sixteen-foot golden body" refers precisely to this: when humans refine and ingest this true gold, they immediately transcend mundanity, transforming form into formlessness. Gathered, it manifests as a majestic golden body; scattered, it dissolves into empty space with boundless, unpredictable transformations—responding effortlessly to all conditions while the true essence remains eternally unmoved.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) practice. The concept of the Western Paradise is merely superficial appearance—true cultivation lies in mastering the union of Yin and Yang energies. Historically, after Sakyamuni Buddha entered nirvana during the late Zhou dynasty, his relics weren't brought back until Emperor Ming of Han's reign, later buried in Fengxiang, with a leg bone exhumed during Emperor Xianzong of Tang's reign. How can such physical remains compare to the supreme Daoist method of the Yellow Emperor ascending to heaven astride a dragon?

The crux of cultivation lies in apprehending the "True Unity Qi" (primordial energy). In the state of hazy indistinction, one may perceive the "dragon's vibrating energy" (Yang essence); within profound mystery, one experiences the "tiger's vibrating energy" (Yin essence). These two energies possess substance without form—invisible and inaudible yet undeniably real. The True Unity Master (Neidan patriarch) taught: the formless corresponds to the dragon (mercury Qi), while the substantial manifests as the tiger (lead essence). When Yin and Yang energies mutually resonate, being emerges from non-being, and form dissolves into formlessness, ultimately condensing into a millet-sized Golden Elixir (internal alchemy) suspended in the body's void, radiating iridescent light. How could mere silent meditation practitioners comprehend this truth?

Authentic adepts move through worldly dust without revealing their brilliance—round when roundness is needed, square when squareness is required, remaining eternally unfathomable. Like wearing coarse cloth while harboring jade within, they transcend all distinctions between self and other, beyond favoritism or alienation—this is the way of immortals.

The appended five poems further clarify: abandon false practices and seek genuine longevity methods. It's like brewing the elixir of extended life within the alchemical cauldron (Dantian), gathering the soul-restoring nectar (essential Qi). The Can Tong Qi (classic alchemical scripture) states: substances of the same kind produce swift results, while dissimilar elements yield no artifice. Many practitioners cling to erroneous methods, refusing to learn the true art of Yin-Yang harmonization. Gathering the prenatal Yang elixir within the cauldron while nurturing the life-giving primordial Qi within the body—these twin treasures form the ultimate means of self-cultivation.

Fortune and misfortune follow like shadows—the key lies in mastering the mechanism of life and death transformation. A single thought can turn calamity into blessing. This speaks precisely to comprehending the mystery of Yin-Yang transformation, the principle of internal refinement that transmutes vital energies.

This scripture elucidates the profound process of Yin-Yang transformation and the mystical union of Dragon and Tiger in Daoist Neidan (internal alchemy) practice.

Yin and Yang represent the most fundamental forces in the cosmos—Yang symbolizes growth and blessings, while Yin embodies austerity and calamity. Their waxing and waning follow natural rhythms, like shadows following form or echoes responding to sound. The key to cultivation lies in reversing this cycle of life and destruction.

The text employs vivid metaphors such as "knocking bamboo to summon the turtle" and "strumming the zither to beckon the phoenix" to describe cultivation methods. Here, "bamboo" symbolizes an empty, emotionless state, while the "zither" represents harmonious, righteous tones. The "turtle" (Black Tiger) and "phoenix" (Red Dragon) refer to two types of innate Qi (vital energy) within the human body. Through specific breathing techniques (known as "moving the fire"), these two energies merge harmoniously, akin to the union of husband and wife.

When cultivation reaches a certain stage, one experiences a surge of true Qi ascending along the spine to the crown of the head (the Muddy Pellet Palace, or Niwan). Like sweet golden nectar, this liquid descends from the upper palate into the throat (the Multi-Storied Tower, or Chonglou), where it is gently swallowed and guided down to the Dantian (energy center), circulating continuously. At this stage, closing the eyes and turning the gaze inward reveals the five viscera radiating golden light, the body enveloped in a mist-like energy field—a state utterly distinct from ordinary existence.

The text concludes by noting that worldly attachments—such as familial love ("carrying the burden of home, clinging to wife and children")—hinder the path to enlightenment. True practitioners must focus their minds like a monkey reining in its restless nature. When the three thousand merits are fulfilled, they naturally attain the state of unity between Heaven and humanity, transcending all mundane entanglements.

Note: Terms such as "Dragon and Tiger," "golden nectar," and others are Neidan terminology, representing the Yin-Yang energies within the body and the refined substances produced through cultivation. "Moving the fire" refers to breath-regulation techniques, while "Muddy Pellet" (Niwan) and "Multi-Storied Tower" (Chonglou) are vital acupoints in the body.

This passage discusses the coordinated application of internal and external medicinal substances in the practice of Neidan (internal alchemy, the Daoist method for cultivating longevity). The author reminds practitioners to pay attention to several key points:

First, it points out that even if one comprehends the true suchness of inherent nature (a Buddhist term referring to the fundamental nature of reality), improper cultivation may still cause one to miss the opportunity for immortality. To truly refine the Great Medicine (referring to internal elixir), one must transcend the state of non-leakage (a Buddhist meditative attainment) to become a Zhenren (perfected person).

The text then employs the metaphor of the "Xijiangyue" poetic form: the West represents the direction of Metal, the river symbolizes the nature of Water, while the moon illustrates the function of medicinal substances. This demonstrates that internal and external medicines (the two essential components of Neidan practice) share the same fundamental principle and require coordinated application. Just as in alchemy, the initial harmonization of the "elixir head" (the preliminary substance formed in the early stages) and the process of "gentle nurturing" (controlling the firing times) follow similar principles.

Quoting the "Yimen Pomi Ge," it explains: While the Dao (the foundation of cultivation) resides within, the placement of the furnace and cauldron (metaphors for the cultivation site) exists externally; when the Dao manifests externally, Li and Kan (two trigrams representing Fire and Water) and mercury-lead (alchemical terms) return to the interior. This illustrates the relationship between internal and external medicines:

External medicine refers to the Golden Elixir, which can be refined in the "two-eight furnace" (a cauldron balancing Yin and Yang) within a short period. Internal medicine is the "returned elixir of golden fluid" (an advanced internal elixir), requiring ten months of cultivation within oneself to achieve complete transformation. Though both medicines function similarly in harmonizing the elixir head, the actual control of firing times differs significantly in practice. Practitioners must exercise extreme caution to avoid the slightest error.

While internal medicine relies on the true fire (primordial Qi) within the body, continuously burning in the "earthen cauldron" (a metaphor for the Dantian), it still requires the "external furnace" (conscious cultivation efforts) to constantly regulate the firing process. The subtle mysteries of internal and external true fire transformations ultimately depend on the function of true lead (an alchemical term referring to primordial Qi), which controls true mercury (representing the spirit-mind) to prevent its dissipation.

Some misunderstand this principle, believing internal medicine only requires refinement through true fire while external medicine needs ordinary fire regulation—a view as laughable as observing the sky through a bamboo tube. In truth, though internal and external cultivation differ in form, they share the same essential principle. The so-called distinction between internal and external exists because the human body inherits the numinous Qi of heaven and earth, taking form through the creative transformations of Yin-Yang. Therefore, cultivation must take Jing (essence), Qi (vital energy), and Shen (spirit) as its fundamental basis.

This scripture elucidates the core principles of Daoist Neidan (internal alchemy) cultivation, emphasizing the distinction between pre-heaven Qi (innate energy) and post-heaven Qi (acquired energy).

The human body contains three fundamental elements: Jing (essence), Qi (vital energy), and Shen (spirit), which mutually transform—Shen generates Qi, Qi generates Jing, and Jing in turn nourishes Shen. However, these all belong to the yin energies of post-heaven existence. If practitioners only cultivate these acquired forms of Jing, Qi, and Shen, they ultimately cannot transcend the constraints of cosmic laws.

Zhongli Quan (one of the Eight Immortals) observed that seven bodily substances—including fluids, essence, and blood—are all yin in nature. Just as a hen cannot hatch eggs alone, cultivating only these yin energies makes it difficult to attain the Great Dao. True practitioners understand they must gather the pre-heaven Qi (primordial cosmic energy), which simultaneously contains both authentic yin and yang properties. By uniting these two energies during specific celestial hours, one can refine the pure-yang Golden Elixir, known as "true lead."

The cultivation process involves two medicinal components: external medicine (pre-heaven primordial Qi, the mother energy) and internal medicine (one's innate Qi, the child energy). Using pre-heaven Qi to harmonize one's own Qi is as natural as a mother cat retrieving her kitten. When pre-heaven Qi transforms the practitioner's yin mercury (metaphor for acquired Jing-Qi), it converts into a pure-yang constitution. Through regulated breathing techniques (symbolized as yin-yang talismanic fire) and a ten-month gestation-like cultivation cycle, one achieves the stages of form transforming into Qi, Qi transforming into Shen, and Shen merging with the Dao.

Upon reaching this state, practitioners transcend cosmic limitations, no longer bound by yin-yang laws. This mystical realm relies entirely on pre-heaven Qi's efficacy. Therefore, the true elixir must be pre-heaven primordial energy—it cannot be substituted with mundane substances like ordinary cinnabar or mercury from the post-heaven realm.

Those who cultivate the Dao must seek the fundamental truth, avoiding deceptive teachings that may lead to the three evil paths (hell, hungry ghosts, and animal realms). The so-called "sevenfold return of cinnabar" and "ninefold reversion of golden fluid" in cultivation methods are actually based on the mutual generation and restraint of the Five Phases (Wood, Fire, Earth, Metal, Water) in heaven and earth—they cannot be simplistically calculated through temporal cycles (such as the hours of Yin-Zi or Kun-Shen).

To elaborate: Water corresponds to the northern Kan position, generated by the celestial number one and completed by the earthly number six. Fire corresponds to the southern Li position, generated by the earthly number two and completed by the celestial number seven (this is the origin of "sevenfold return of cinnabar"). Wood corresponds to the eastern Zhen position, generated by the celestial number three and completed by the earthly number eight. Metal corresponds to the western Dui position, generated by the earthly number four and completed by the celestial number nine (this is the principle behind "ninefold reversion of golden fluid"). Earth resides at the center, generated by the celestial number five and completed by the earthly number ten. The Golden Elixir (Jindan) is formed precisely through these generative transformations of the Five Phases.

The crux of cultivation lies in the "Water of True Unity" (primordial Qi), which undergoes cyclical transformations through the Five Phases: in the north it becomes water, in the south it transforms into cinnabar, in the east it shifts to mercury, in the west it solidifies as golden lead, ultimately coalescing in the center as the Golden Elixir. This process requires the completion of solar and lunar cycles and seasonal transitions—only when the dual energies of Yin-Yang reach fullness can one naturally attain profound realization. All these transformations originate from the "Mysterious Feminine" (Xuanpin), the source of Yin-Yang energies.

Authentic cultivation must grasp the principle of "lead and mercury joining": like ruler and minister in harmony, or metal and wood in mutual attraction, it requires the matchmaker (true intention) to mediate. Wood's nature delights in metal (though metal restrains wood), while metal's affection yearns for wood—what appears as restraint actually facilitates generation. It is precisely within this dynamic of mutual generation and restraint that the Golden Elixir is nurtured. The essence of internal alchemy (Neidan) lies in mobilizing one's genuine Qi (the ministerial energy), which requires true metal (primordial Qi) to coalesce, while the formation of the Golden Elixir fundamentally depends on the mercury (original spirit, Yuanshen) within oneself.

This passage elucidates the principle of Yin-Yang energy interaction in Neidan (internal alchemy) practice. The "two numinous substances" refer to lead (representing primordial Qi and metallic nature) and mercury (symbolizing postnatal spirit and wooden nature), which must attract each other like lovers to generate spiritual transformation. During cultivation, the "Yellow Matron" (the spleen-earth at the central palace serving as mediator) facilitates their union in the Dantian (energy center), mirroring conjugal harmony that conceives an infant—ultimately forming the Golden Elixir within the body.

The text specifically clarifies that the "White Tiger's First Scripture" does not denote menstrual blood, but rather the primordial Qi of creation (also called "True Unity's Energy"). This pre-celestial force bears different names according to its manifestations: "Celestial Water" in heaven, "First Crescent" in the White Tiger position, or "Divine Nectar of the Jade Pool" when in the mouth—all representing the most precious "True Gold." Originating before heaven and earth, it far surpasses ordinary medicinal substances formed post-celestially.

Regarding the "Ninefold Refined Golden Elixir" cultivation, nine years are required for completion. After the ten-month gestational period (Neidan incubation phase), practitioners must maintain quiescent Wuwei (non-action) like Bodhidharma's wall-gazing, unifying form and spirit with the Dao. Specific methods include: tempering mind-nature, timely fire-phasing regulation, and vigilant danger prevention. Through the rhythmic rising and sinking of fire phases, one ultimately achieves the transformation sequence: form dissolving into Qi, Qi sublimating into Shen (spirit), and Shen returning to emptiness—transcending physical constraints. Bodhidharma's legendary "single-shoe westward return" exemplifies this attainment. Throughout the process, maintaining humble gentleness while avoiding rash advancement proves essential for success.

This scripture primarily discusses the vital importance of the harmonious interplay between Yin and Yang energies in Daoist cultivation. Using natural metaphors—the annual reunion of the Cowherd and Weaver Girl stars, the monthly conjunction of the moon and sun, and the intertwined forms of tortoise and snake—it illustrates the interdependent relationship between these two energies. These phenomena embody the fundamental principles of cultivating the Golden Elixir (Jindan).

The true Dao (referring to the essence of cultivation) is the formless, imageless "Qi of True Oneness." Yet without the mutual resonance and cooperation of Yin and Yang energies, the embryonic form of the Golden Elixir (the "millet-sized" nascent stage) cannot take shape. Even if one obtains the elixir ingredients, without the harmonious circulation and tempering of Yin and Yang energies (symbolized by the "seal-fire's misty vapor"), the refined Golden Liquid Returning Elixir (the advanced alchemical product) cannot be perfected. As the Cantong Qi (The Seal of the Unity of the Three) states: "The male bird does not dwell alone, nor does the female live in isolation; the Dark Warrior (Xuanwu, the northern celestial creature) intertwines as tortoise and snake"—demonstrating that Yin and Yang must complement each other.

The enduring existence of heaven and earth relies precisely on this natural principle of Yin-Yang union. If these energies become blocked and disconnected, problems arise, and the cosmos cannot sustain its longevity. The Yijing (Book of Changes) declares, "The alternation of Yin and Yang is called the Dao." Immortal Elder Zhang Boduan (referenced here as "Xianweng") repeatedly emphasizes this truth in this chapter—a principle genuine cultivators should contemplate deeply.

The Golden Elixir (representing the pinnacle of cultivation) is supremely sacred, yet there is concern that practitioners may lack sufficient virtue (De) to bear its power. Harmonizing lead and mercury (symbolizing Yin and Yang energies) does not require extended time—the embryonic form of the elixir can manifest swiftly. True adepts can achieve success even amid bustling marketplaces. Upon ingesting the elixir, one immediately attains sagehood—is this not the most divine transformation? The alchemical process yields visible results within half a day—is this not remarkably simple? Yet when spoken aloud, people find it hard to believe. Those who obtain the Golden Elixir may fear their accumulated hidden virtue (Yin De) is insufficient to bear such a supreme treasure.

This passage elucidates the essential principles and common misconceptions in Neidan (internal alchemy) practice. It begins by emphasizing that internal alchemy cultivation is no trivial matter. If practitioners cannot even distinguish the Five Phases (Wood, Fire, Earth, Metal, Water) or the Four Symbols (Lesser Yang, Greater Yang, Lesser Yin, Greater Yin), nor recognize fundamental alchemical materials like cinnabar, mercury, lead, and silver—yet presumptuously claim mastery over fire tempering (temperature control in alchemical processes)—they not only err themselves but mislead others onto perpetual wrong paths. Such behavior fundamentally violates cosmic principles.

The author stresses that the Zhouyi Cantongqi (The Kinship of the Three) stands as the most profound scripture among alchemical texts, with its "Three-Character Cauldron Verses" (likely referring to crucial passages about the alchemical furnace) containing the essential marrow of alchemical practice. Yet most students of the Dao fail to comprehend this, which remains profoundly puzzling. The text suggests using these verses to verify one's understanding—if they still prove incomprehensible, it indicates insufficient realization.

Many contemporary Daoist practitioners attempt to teach others without even mastering basic breathing techniques like exhaling the old and inhaling the new (Tu-Na exercises), deludedly aspiring to ride clouds and mist. Such self-righteous instruction harms both teacher and student unknowingly, making their wasted lives truly regrettable.

Key alchemical terminology is then explained: "Two eights" (二八) signifies the yin number (symbolizing the genuine Qi of a sixteen-year-old maiden), where the "charming maiden" (姹女) represents true Qi, also called wood liquid; "Nine threes" (九三) denotes the yang number (symbolizing the yang elixir of a twenty-seven-year-old youth), where the "young lord" (郎君) represents the yang elixir, also called metal essence. When these two unite within the Dantian (energy center)—metaphorically described as an earthen cauldron within the body—they form the Three Natures (Jing/essence, Qi/vital energy, and Shen/spirit). This process requires the tempering of "Ding Gong" (fire regulation), mirroring marital union, with continuous circulation via the "River Chariot" (kidney water) until reaching the "Kunlun Peak" (Baihui point at the crown of the head).

"Masculine harboring feminine substance" describes the yin Qi within the dragon (liver energy), while "bearing yin yet embracing yang essence" refers to the yang Qi within the tiger (lung energy). Only through harmonizing these can the elixir be perfected, capable of transforming the ethereal and corporeal souls. Upon ingesting the Golden Elixir, snakes morph into dragons and chickens into phoenixes—metaphors for the practitioner's transcendent metamorphosis into pure yang immortality. These animal transformations symbolize the cultivator's complete spiritual and physical refinement.

These two passages explain the core principles of Neidan (internal alchemy) practice and the mastery of firing times.

The first passage describes how the spiritual elixir naturally forms when the two energies of Yin and Yang (the two substances) merge. Once ingested, it transforms the Yang spirit and dissolves Yin impurities. Even a grain-sized portion of this elixir—like a chicken consuming it to become a phoenix or a snake swallowing it to transform into a dragon—can elevate one to the sacred realm of true Yang. This elixir is supremely divine, mirroring how heaven and earth cycle through day and night and all things follow natural laws. The key lies in mastering the technique of "adding and withdrawing" (adjusting the firing times). In practice, the firing process begins with the Zhun hexagram (initial Yang) and concludes with the Pi and Tai hexagrams (Yin-Yang balance). Daily practice involves circulating the "talisman fire" (breath and intention) back to the Dantian (energy center), much like spokes converging on a wheel's hub or rivers ultimately flowing into the sea.

The second passage emphasizes the importance of "attaining the One" (obtaining the primordial Qi before the division of Yin and Yang). This "One" is the original, undifferentiated true Qi that gives rise to the Four Symbols, Five Phases, and all phenomena. Once this "One" is attained, the entire practice is complete, with no further need to distinguish directions like east or west. One must continually reduce acquired distractions and carefully preserve previous cultivation achievements. This "One" manifests only through refinement by the dual fires of Yin and Yang, and after attainment, it must be ingested and nurtured within the five organs. The "treasure of life" mentioned here refers to the Mysterious Pearl (the inner elixir), and during practice, one must guard against dangers and avoid reckless actions.

The text later uses the twelve hexagrams of the Book of Changes to illustrate firing times: beginning with the Fu hexagram (the first Yang line at the winter solstice), each thirty days adds another Yang line, progressing through the Lin, Tai, Dazhuang, and Guai hexagrams until the Qian hexagram (pure Yang) is formed at the summer solstice. Then, the first Yin line appears as the Gou hexagram, with each subsequent thirty days adding another Yin line, passing through the Dun, Pi, and other hexagrams to complete the Yin-Yang cycle. This corresponds to the timing for applying Yang fire and Yin talismans throughout the year.

This passage elucidates the principles of Yin-Yang transformation in Daoist Neidan (internal alchemy) practice and their practical application in cultivation.

The text first employs hexagrams to explain the waxing and waning cycle of Yin and Yang: from the Guan hexagram through Bo to Kun, representing the gradual growth of Yin energy to its peak (pure Yin state), after which Yang energy naturally re-emerges in an endless cycle. The sages condensed the annual cycle of Yin-Yang changes into a monthly pattern: the new moon (shuo dan) corresponds to Fu hexagram (initial Yang birth), developing over fifteen days to the full moon's pure Qian hexagram (Yang at its zenith). From the sixteenth day onward, Gou hexagram appears (initial Yin birth), when despite the moon's apparent fullness, Yin energy begins its subtle emergence.

This monthly Yin-Yang rhythm is further condensed into a daily cycle: midnight (zi hour) with its Yang birth corresponds to Fu hexagram, while noon (wu hour) with its Yin birth matches Gou hexagram. Practitioners must precisely apprehend these critical moments of transformation ("dusk-dawn" symbolizes Yin-Yang transitions), regulating their internal fire (referring to breathing techniques called "Yin talisman and Yang fire") according to the cosmic patterns of rising and descending energies, without the slightest deviation.

At advanced stages of practice, when virtue (De) accumulates abundantly ("eight hundred" and "three thousand" symbolizing perfected merit), one attains the state where self and objects are both forgotten, with form and spirit completely transformed. At this stage, neither external threats like weapons or wild beasts nor internal afflictions and attachments (the "impermanent burning house" metaphor for human desires) can cause harm, enabling free liberation of beings. Ultimately, celestial talismans descend (symbolizing alchemical accomplishment), and one ascends to immortal realms ("azure void" denoting heavenly spheres) - the true realization of Daoist transcendence.

When the Neidan practice perfects the "marvelous treasure of the physical form" (the human body as alchemical vessel), it gains infinite transformative capacities, yet must still pursue spiritual awakening ("true essence" meaning the Dao's primordial source). Without awaiting future rebirths, one attains miraculous powers in this very life. The text mentions an Immortal Elder (possibly referring to Lü Dongbin) who composed twelve chapters of "Moon Over West River" poetry to clarify cultivation's true meaning, expounding the profound teachings of "western arrival" and "western return" (likely indicating the dual cultivation of nature and life, and the essential return to origin). Those who achieve complete realization understand the physical form's inherent emptiness - transcending this illusory body to attain the jade-like pure Yang form (symbolizing crystalline immortality).

This passage discusses the supreme state of "perfected form and spirit" (xingshen jumiao) in Daoist cultivation. The golden fluid (jinye, an internal alchemy term referring to refined essences produced through practice) that safeguards the divine can refine the physical form, enabling both the corporeal body and the primordial spirit (yuanshen) to attain mystical states, ultimately merging with the great Dao (Da Dao).

The text then poses a rhetorical question using the story of Bodhidharma (the first patriarch of Chan Buddhism) bringing teachings from the West: Was it Bodhidharma who came to enlighten Master Wuzhen (referring to Zhang Boduan, author of the Wuzhen pian), or was Master Wuzhen actually an incarnation of Bodhidharma? This inquiry actually explores the fundamental common ground between Daoist and Chan Buddhist practice—whether through the Daoist path of "merging with Dao's truth" or the Chan approach of "illuminating the mind to see one's true nature," both ultimately point to the same supreme truth.

This excerpt from the middle volume of the Wuzhen pian Commentary reflects the characteristic integration of Daoist internal alchemy (neidan) theory with Chan Buddhist thought during the Song and Yuan periods. Through the practice of golden fluid reverted elixir (jinye huandan), practitioners refine both body and spirit to achieve a perfected state of harmony with the cosmic source.

This passage is a commentary on the Daoist classic Wuzhen Pian (Awakening to Reality), written by the Southern Song dynasty Daoist Weng Yuanming (also known as Nameless Master). It explains the core ideas of Zhang Boduan (known as Master Ziyang) regarding the cultivation of immortality.

The so-called "Way of the Immortals Embracing the One" refers to the practitioner's attainment of a state of pure Yang through prolonged cultivation, where the innate primordial Qi (Zhenqi) transforms into the primordial spirit (Yuanshen), ultimately merging with the Dao. Here, the "Dao" refers to the original nature of humanity—the unity of mind and nature, capable of generating infinite transformations. Ordinary people, unaware of this principle, dismiss it as mere natural phenomena. But those who grasp the true essence, transcending the limitations of form and language while maintaining a tranquil and empty mind, can focus on the practice of "embracing the One." Through the nine cycles of refining the Golden Elixir (a nine-year cultivation period, with nine being the ultimate Yang number), they can achieve the state of an immortal.

The "One" in "embracing the One" is another name for the Dao, while "embracing" actually refers to a state of non-attachment to all things. An immortal who cultivates to this level sheds the constraints of the body, surpasses worldly understanding, dissolves the distinction between self and other, clings to no fixed views, neither craves nor rejects, and attains perfect unity of mind—free and unfettered. After nine years of cultivation, reaching the state of "Great Stability" (a profound meditative stillness), innate wisdom (Heavenly Light) manifests. When one's original nature is fully realized, this wisdom illuminates all directions; the primordial spirit becomes unobstructed and spiritually potent, capable of manifesting countless emanations and responding to conditions, while the fundamental true essence remains eternally serene and Wuwei (non-acting).

After Zhang Boduan attained the Dao, he once demonstrated the state of neither birth nor extinction to his disciple Liu Fengzhen—entering quiescence (similar to nirvana) yet later manifesting his true form at Mount Wangwu. This is like how the Chan Patriarch Bodhidharma, after nine years of wall-gazing, though having entered quiescence, could still depart westward with a single sandal; or how the Tathagata, after nirvana, had his golden coffin rise into the sky, only to reappear in golden form to teach the Dharma when his mother wept; or how the Great Being of Putuo could cast himself into flames yet manifest in the void—how could such miraculous phenomena be possible without the dual cultivation of nature and life (Xingming Shuangxiu), where both form and spirit attain perfection? Thus, in the final section of Wuzhen Pian, Zhang Boduan particularly emphasizes this supreme state of unity between Chan and Dao.

The principles of cultivating one's innate nature are actually distinct from the "embracing the One" (union with the Dao) practice pursued by immortals. Therefore, I have separated this content into three volumes. The truth of innate nature is formless and boundless, silent and chaotic, difficult to describe with words. Whether human or non-human, all are equal in their fundamental nature, with no hierarchy.

Since beginningless time, all things with form and name have been inherently complete and perfect. Because they are originally pure, natural, and fully sufficient, they fundamentally require no verbal description. Yet the Buddhist canon contains over five thousand volumes—this is solely because realizing the great Dao is profoundly difficult, and words become a reluctant necessity. Later generations use these texts to comprehend the truth, but once truly understood, the words themselves become obstacles. The Diamond Sutra states, "If someone claims the Tathagata has expounded teachings, they slander the Buddha," showing that verbal expression is inherently limiting. Now this Immortal Elder sings of innate nature's principles out of necessity, and having said enough, I dare not add superfluous explanations.

I only hope that those of courageous diligence and profound wisdom will not seek externally but awaken to understanding within their own hearts. Awakening alone, taking full responsibility in the present moment, truly embodying the realization. Whether in stillness or activity, speaking or silent, even amidst taverns and brothels—maintaining the original mind. Everywhere without distinction, all things in harmony. The entire universe like a single eye, one body, with wondrous functions inexhaustible, perfectly unobstructed. Heaven, earth, and all things are utterly real, nowhere inapplicable. Know that here (in innate nature) all is originally pure and complete, entirely without lack, transcending all conceptual thought. No need for questions or answers, no need for pondering—even the word "Buddha" becomes unnecessary.

Reflections on studying the Zhouyi Cantong Qi (Classic of the Harmony of the Seen and Unseen):

The mysterious method of refining the Golden Elixir (Neidan practice) lies in applying the Dao of Qian (Heaven) and Kun (Earth). When Yin and Yang operate, the Five Phases (Wood, Fire, Earth, Metal, Water) differentiate; when the Five Phases follow their natural course, they create the ordinary state of birth and death; when the Five Phases reverse their course, they achieve the indestructible Elixir body. Qian and Kun symbolize father and mother—through circulating the two energies of Yin and Yang, they transform into the Five Phases to create all things. Following the creative transformations of Yin and Yang produces ordinary humans, hence the human body contains both Yin and Yang, and thus experiences birth and death.

Yang Qi governs life, Yin Qi governs death—one birth, one death, coming and going: this is the pattern of the mundane world.

The natural operation of the universe follows the inherent principle of the Dao, yet sages practice contrary to this conventional path. They reverse Yin-Yang and invert the natural order of creation, using Heaven and Earth (Qian and Kun) as their alchemical cauldron, appropriating the primordial Qi (Xiantian Yiqi) to refine the Golden Elixir (Jindan). With this elixir, they transform their physical form until achieving a formless state, ultimately merging with the supreme Dao. Since the Dao has no limits, those who attain immortality naturally achieve eternal existence.

The cosmic evolution unfolds thus: from emptiness emerges substance, as the two energies (Yin and Yang) differentiate from chaos. The alternation of the four seasons (Sixiang) arises from the interaction of these two energies, while the Eight Trigrams (Bagua) mutually influence one another as cause and effect. The birth and demise of all phenomena, the occurrence of fortune and misfortune—all stem from these transformations. Ordinary people utilize these principles daily without understanding them, while only sages can investigate their root. Thus, the "Book of Changes" (Yijing) profoundly elucidates the essence of creation, using hexagrams to manifest these truths.

Emptiness is the substance of the Dao. When the Dao generates primordial Qi (Yiqi), it divides into Yin and Yang. Yang forms Heaven, while Yin forms Earth—these are the Two Modes (Liangyi). Heaven, represented by the number "one," generates Water in the north, corresponding to winter; Earth, represented by "two," generates Fire in the south, corresponding to summer. Heaven, with "three," generates Wood in the east, corresponding to spring; Earth, with "four," generates Metal in the west, corresponding to autumn—thus forming the four seasons (Sixiang). Heaven is the Qian trigram, located in the northwest (Xuhai); Earth is the Kun trigram, located in the southwest (Weishen).

The Kun trigram draws Yang energy from Qian to produce three Yang trigrams: the eldest son, Zhen, in the east (Mao); the middle son, Kan, in the north (Zi); and the youngest son, Gen, in the northeast (Yinchou). The Qian trigram draws Yin energy from Kun to produce three Yin trigrams: the eldest daughter, Xun, in the southeast (Chensi); the middle daughter, Li, in the south (Wu); and the youngest daughter, Dui, in the west (You). This completes the Eight Trigrams (Bagua), representing the eight directions. From Zi (midnight) to Si (mid-morning) belongs to the Yang realm, while from Wu (noon) to Hai (midnight) belongs to the Yin realm. The movement of Yin and Yang drives the cyclical circulation of seasonal energies through the eight directions, interacting as cause and effect to produce transformation.

Spring and summer are the peak of Yang energy, nourishing the growth of all things—when beings receive this grace, they flourish. Autumn and winter are the peak of Yin energy, causing all things to wither—when beings endure this austerity, they decline. Fortune and misfortune, all phenomena, the changes of the trigrams, the rotation of seasons, and the waxing and waning of Yin and Yang all originate from the movement of primordial Qi—this is the manifestation of the supreme Dao. Thus, the Dao takes Qi as its root, while the four seasons, Yin-Yang, the Five Phases (Wuxing), the Eight Trigrams, all phenomena, and fortune and misfortune are one and the same, omnipresent.

Therefore, whether in seeing, hearing, speaking, moving, sleeping, eating, or any daily activity, or in encountering various events, even strange and uncanny phenomena—none are beyond the expression of the Dao. The Dao resides within humans, yet they remain unaware; humans live within the Dao, yet the Dao never fails them. Thus, people employ the Dao every day without understanding its principles.

The sage, through profound exploration of hidden mysteries and exhaustive investigation of the principles governing all things, penetrates the nature of existence and ultimately masters the laws of celestial destiny. Thus, they employ the arcane principles of the Book of Changes (Yijing), treating Qian (Heaven) and Kun (Earth) as the gateway to the Changes. Once Heaven and Earth are established, the Dao operates within them. From these two primal forces emerge the Eight Trigrams (Bagua), whose combinations give rise to the sixty-four hexagrams.

Each hexagram consists of six lines: odd numbers represent the unbroken (yang) lines, while even numbers denote the broken (yin) lines. A single yang line, multiplied by four and nine, yields thirty-six stalks (divination counters used in ancient milfoil rituals), and six yang lines total two hundred sixteen stalks (Note: The original text contains a miscalculation; the correct sum is 216 stalks). A single yin line, multiplied by four and six, produces twenty-four stalks, and six yin lines amount to one hundred forty-four stalks. Combined, the Qian and Kun hexagrams yield three hundred sixty stalks, and all sixty-four hexagrams together produce eleven thousand five hundred twenty stalks. This is the Supreme Ultimate’s Great Expansion Number (Taiji Dayan zhi shu), the fundamental numerical expression of cosmic transformation, encompassing the Three Powers (Sancai—Heaven, Earth, and Humanity) and all phenomena in existence. All signs of fortune and misfortune, regret and remorse, life and death, calamity and blessing are contained within this numerical framework.

Wei Boyang (a pivotal figure in Daoist alchemical tradition), recognizing the correspondence between the principles of the Book of Changes and the practice of Golden Elixir (Jindan) cultivation, composed the Zhouyi Cantongqi (The Kinship of the Three), using hexagram imagery to elucidate the essentials of alchemical practice. For example: the Pi and Tai hexagrams symbolize the ascent and descent of yin and yang; the Zhun and Meng hexagrams represent movement and stillness, dawn and dusk; Kan and Li correspond to the interplay of water and fire, male and female; Zhen and Dui subtly signify the dragon and tiger, or the hun and po souls. Maintaining the Middle Way (zhongdao) brings auspiciousness, while excess leads to the loss of one’s foundation. The Ji Ji and Wei Ji hexagrams reveal the beginning and end of all things, while the Fu and Gou hexagrams demonstrate the movement of yin and yang qi. The waxing and waning of the moon mirror the flourishing and decline of the spirit (shen), while the rising and setting of the sun align with the warming and cooling of qi and blood.

A genuine Daoist practitioner reading the Cantongqi does not cling to its literal text. The crux of alchemy lies in the two characters "gold and fire" (jin huo): "gold" refers to the Golden Elixir (Jindan, also called "true lead"), while "fire" denotes the yin and yang qi (also termed "yin talisman" and "yang fire"). To refine the Golden Elixir, one must first establish true yin and true yang as the furnace and cauldron (the foundation of practice), then guide the Supreme Ultimate’s single qi (Taiji yiqi, the primordial energy) to condense into the elixir. This Supreme Ultimate qi is undifferentiated chaos, containing both yin and yang—the very forces the practitioner must harmonize.

This passage explains the core principles of Daoist Neidan (internal alchemy) practice. Practitioners must harness two fundamental forces—true Yin and true Yang (referring to the dual Qi energies within the human body). Just as the Zhouyi Cantongqi (The Seal of the Unity of the Three) uses the Qian (Heaven) and Kun (Earth) hexagrams to symbolize the alchemical cauldron, and the Kan (Water) and Li (Fire) hexagrams to represent the medicinal ingredients (the essential Jing and Qi required for cultivation), the remaining hexagrams correspond to the thirty-day lunar cycle of practice.

Specifically, Qian and Kun symbolize the Dragon and Tiger (kidney Qi and heart Qi), Zhen and Dui represent the marital couple (Yin-Yang interaction), as well as the Hun and Po (spirit and physical form). Kan and Li signify lead and mercury (original Jing and original Shen), water and fire (kidney water and heart fire), and the complementary nature of masculine and feminine energies (Yin-Yang harmony). These metaphors all illustrate the dynamic interplay between Yin and Yang energies.

During cultivation, these two energies must merge at the Central Palace and Yellow Path (the Dantian energy center in the body) to refine the Neidan. This is the meaning behind the phrase "holding to the center brings yellow garments and supreme auspiciousness." Once the elixir is formed, it must be nurtured by true fire (original Yang Qi) to mature the sacred embryo (Golden Elixir). This fire has no fixed position but circulates throughout the entire body.

The text employs seasonal changes as metaphors for the cultivation process: the winter solstice, when earthly Qi rises, corresponds to the Fu hexagram (initial Yang birth); the second month's Yin-Yang balance aligns with the Tai hexagram. The summer solstice, when celestial Qi descends, matches the Gou hexagram (initial Yin birth), while the eighth month's equilibrium corresponds to the Pi hexagram. Practitioners must condense a year's worth of Yin-Yang transformations into a single thirty-day lunar cycle. Lunar phases also mirror cultivation stages: the new moon's first light resembles the Fu hexagram, the waning moon on the sixteenth day parallels the Gou hexagram, and the last quarter moon on the twenty-third day reflects the Pi hexagram. This is the deeper meaning behind "the interaction of Pi and Tai causes Yin and Yang to alternately ascend and descend."

The waxing and waning of the moon corresponds to the flourishing and decline of Jing (essence), Qi (vital energy), and Shen (spirit) within the human body. Practitioners condense the monthly fluctuations of Qi (炁候) into the twelve two-hour periods of a single day for cultivation: During the Zi hour (11pm-1am), when Yang energy first emerges, the kidneys produce pure Yang Jing-Qi (一阳纯精之炁), marking the time to "advance the Yang fire" (a Neidan term for guiding Yang energy upward), corresponding to the Fu hexagram in the Yijing. At the Wu hour (11am-1pm), when Yin energy begins to arise, the heart descends with supreme Yin Shen-Qi (一阴至神之炁), requiring "advancing the Yin talisman" (guiding Yin energy downward), corresponding to the Gou hexagram. Thus, the Fu and Gou hexagrams reveal the operational principles of Yin-Yang energies.

As sunrise marks day and sunset night, cultivators employ "talisman-fire" (regulating Yin-Yang) throughout the daily cycle, adjusting their internal Qi-blood circulation (荣卫) according to seasonal temperature changes. Through techniques like "extraction-addition" (调节) and "gentle nurturing" (滋养), they cultivate the inner elixir (子珠). The Zi hour initiates Yang-fire advancement as it represents the beginning of six Yang periods, corresponding to the Zhun hexagram. Each full day-night cycle employs two hexagrams, totaling sixty hexagrams over thirty days - with Zhun and Meng hexagrams commencing the sequence and Ji and Wei concluding it, creating an endless cycle. These represent the profound yet simple principles by which the immortal Wei Boyang (Master Wei) used Yijing symbolism to illustrate the Golden Elixir (Jindan) path.

The immortal Zhang Boduan (author of Wuzhen pian), concerned that later students might fixate on literal interpretations of the Zhouyi Cantongqi while missing Master Wei's symbolic intent, deliberately employed these hexagram correspondences. Yet even with such compassionate explanations, without oral transmission from a true master, ordinary people could scarcely grasp even the surface of Jindan teachings. Upon truly comprehending the Golden Elixir's essential formula, terms like Qian-Kun, Kan-Li, or dragon-tiger lead-mercury become mere expedient means. After mastering the true timing of fire phases, all hexagrams - Zhun-Meng, Ji-Wei, Fu-Gou, Pi-Tai - may ultimately be set aside.