《周易參同契注(二)》

In the annotations to Chapter 2 of the Zhouyi Cantongqi (The Kinship of the Three), it is explained that Qian (Heaven) and Kun (Earth) — the two fundamental trigrams symbolizing heaven and earth — serve as the gateway to all transformations in the Yijing (Book of Changes) and act as the parent trigrams for the other sixty-two hexagrams. Kan (Water) and Li (Fire), like the rim of a wheel and its axle, drive the movement of Yin and Yang.

The Xici Zhuan (Commentary on the Appended Phrases) states, "Qian and Kun are the gateway to the Yijing," because Qian represents pure Yang Qi (vital energy), while Kun represents pure Yin Qi. All Yang lines in the other hexagrams originate from Qian’s Yang Qi, and all Yin lines stem from Kun’s Yin Qi. In the human body, Qian corresponds to the head, governing the outwardly manifest senses such as the eyes, ears, nose, and tongue, while Kun corresponds to the abdomen, housing the internal organs like the heart, liver, spleen, lungs, and kidneys. In nature, all Yang phenomena originate from Qian, and all Yin phenomena originate from Kun.

Before the other hexagrams came into being, Kan (Water) was already latent within Kun, and Li (Fire) was latent within Qian. In the human body, the kidneys, associated with Kan, reside in the lower region, while the heart, associated with Li, resides in the upper region. When the Qi of Kan and Li interact—the Yang within Kan and the Yin within Li—they generate the transformations of the sixty-four hexagrams. The union of Yin and Yang in the body resembles the coupling of the Kan male and Li female, forming the foundation for Neidan (internal alchemy) practice. This dynamic is akin to the way a wheel’s axle drives its spokes in harmonious motion.

The text further explains that these four trigrams—Qian, Kun, Kan, and Li—function like a bellows (tuoyue), propelling the movement of Yin and Yang. Mastering them is like steering a chariot: internally, there are guiding principles, and externally, movement follows naturally. Just as a charioteer controls the reins to keep the wheels on course, these trigrams regulate the flow of change. Numerologically, the numbers associated with them—nine for Qian, six for Kun, seven for Kan, and eight for Li—serve as the basis for calendrical and musical calculations. The thirty days of a lunar month are divided into six five-day periods (hou), with the sun and moon governing time, while the interplay of Yin and Yang, hardness and softness, operates in complementary harmony.

These four trigrams encompass all principles of Yin-Yang transformation in the hexagrams. In a broad sense, they cover all patterns of Yin and Yang; in function, they drive the movement of all hexagrams. Like a craftsman using a plumb line to ensure precision or a charioteer guiding a carriage with reins, these numerical patterns form the foundation of ancient calendrical and musical systems.

This passage explains the correspondence between the hexagrams of the Zhouyi (Book of Changes) and temporal cycles, as well as methods for mastering the "fire times" (huohou) in cultivation practice.

First, it discusses the alignment of months with hexagrams: Five days form a basic unit (liuchen), and fifteen days constitute half a cycle, making one month consist of six such five-day periods. Each day employs two hexagrams (such as Zhun and Meng), creating a dynamic balance where firm and yielding qualities complement each other as inner and outer aspects, thus fully encompassing the patterns of Yin-Yang transformation.

The specific practice is as follows: On the first day of the lunar month (shuodan), the Zhun hexagram corresponds to daytime and the Meng hexagram to nighttime, with one hexagram for each period of day and night. Following the Zhouyi hexagram sequence, after Qian and Kun come Zhun and Meng. By using two hexagrams per day, all sixty-four hexagrams cycle through within a month. At month's end (huiri), the Jiji and Weiji hexagrams mark completion, and the cycle restarts with Zhun and Meng in the new month. Not only do the dates follow this order, but the timing of practice is also precise: Zhun and Meng are applied during the Zi hour (11 PM–1 AM), the first quarter moon (7th–8th day) during the Mao hour (5–7 AM), the last quarter moon (22nd–23rd day) during the You hour (5–7 PM), and the full moon (15th–16th day) at the Wu hour (11 AM–1 PM).

The cultivation emphasis also shifts with the seasons: During spring and summer when Yang Qi grows, practice focuses inward (from Zi to Si hours); in autumn and winter when Yin Qi dominates, the focus turns outward (from Wu to Hai hours). This outlines the arrangement of "fire times" (cultivation timing) across the twelve months.

Finally, it addresses the resonance between heaven and humanity: Just as spring's generative energy calls for benevolence and rewards while autumn's austerity demands justice and discipline, cultivators must align with the four seasons and Five Phases. When Yang Qi ascends (spring), one embodies humaneness (ren); when Yin Qi withdraws (autumn), one upholds righteousness (yi). Emotions like joy and anger should mirror the natural progression of seasons in accordance with heavenly principles. Practitioners must internalize spring's Yang-generating qualities, harmonizing their own Yin-Yang with the celestial Dao.

This passage discusses the integration of Daoist alchemical practices with the hexagram symbolism from the Book of Changes (Zhouyi). The first quarter moon (7th-8th lunar day) corresponds to the "Great Strength" (Dazhuang) hexagram, making it the optimal time for "flying metal" operations—the alchemical refinement of metallic essences. Spring belongs to the Wood phase, while metallic essence (Jinjing) actually originates from the Water phase represented by the Kan hexagram. Since Water generates Wood, this process embodies nature's benevolent virtue (De) of sustaining life.

The last quarter moon (22nd-23rd lunar day) aligns with the "Return" (Fu) hexagram, ideal for herb gathering. Autumn corresponds to the Metal phase, while medicinal substances represented by the Li hexagram belong to the Fire phase. Here Fire controls Metal, maintaining Five Phases (Wuxing) balance like suppressing rebellion. Such seasonal alignment with the Five Phases naturally accords with cosmic principles.

Chapter Six explains yin-yang transformations after Heaven-Earth positioning. With Qian (Heaven) and Kun (Earth) establishing their places, Kan (Water) and Li (Fire) circulate between them. These two hexagrams manifest Qian-Kun's functions—having no fixed positions but cycling through the six mutable lines (liuyi). Though patternless, this change encompasses all things, forming the guiding principle of Daoist practice.

The purely yang Qian hexagram symbolizes Heaven's virtue (De), yet cannot function alone—it requires yin's softness. Like wise men maintaining humility to gain followers, the Yijing states "seeing headless dragons" (non-competition) brings good fortune. The purely yin Kun hexagram shows two yin forces cannot govern each other without yang's strength—as the Yijing's "losing companions in the northeast" (yang direction) paradoxically brings fortune.

Thus Qian discusses "using nine" (activating yang) while Kun discusses "using six" (activating yin)—unique among hexagrams. When pure yang generates subtle yin (Li's broken center line), it manifests Qian's function; when pure yin produces subtle yang (Kan's solid center line), it expresses Kun's function. All yang lines in the sixty hexagrams operate through Qian's latent yin, while all yin lines function via Kun's hidden yang. Therefore Qian-Kun form the root of all hexagrams, with Kan-Li as their functional agents—working invisibly through the six mutable lines to propel cosmic movement.

This passage discusses the principles of Yin-Yang change in the Zhouyi (Book of Changes). Originally all hexagram images derive from the pure Yin Kun hexagram (Kun represents Earth and the mother), whose six central yao (line) positions are all empty. Precisely because the center is empty, Kan (Water trigram) and Li (Fire trigram) can change and operate within it, driving the Yin-Yang Qi of Qian (Heaven trigram) and Kun (Earth trigram) to circulate through the six empty positions; thus the system of the sixty hexagrams becomes complete.

Although the two trigrams Kan and Li do not appear directly in the arrangement of the sixty-four hexagrams, they are as important as parents giving birth to the myriad things. In the human body, Qian symbolizes the father (Jing and Qi), Kun symbolizes the mother (blood and Qi), and Kan and Li are the concrete manifestations of Qian and Kun’s functioning. Parents must cooperate with each other to reproduce, just as Yin and Yang must depend on each other; when Kan and Li intersect, the five viscera and six bowels, the bones of the whole body, and the nine orifices (eyes, ears, mouth, nose, and so on) are all generated from this.

Chapter Eight further explains the relationship between “non-being” and “being.” All tangible things (being) depend on formless yang Qi (non-being), just as the body (po) depends on spirit (hun). The “non-being” spoken of here refers to the process by which Kan and Li transform and generate the two Qi of Yin and Yang, thereby forming the sixty hexagrams. “Kan and Li are not used” does not mean that they are unimportant; it means that, like behind-the-scenes movers, they do not directly manifest.

Chapter Nine says that every theory has practical verification. It uses the moon (the Kan trigram, associated with wu) and the sun (the Li trigram, associated with ji) as metaphors: the movement of the sun and moon is the essence of “change” (yi), with firmness and yielding complementing each other. The virtue of central Earth (wu and ji) governs the four seasons, just as the four colors—blue-green, red, white, and black—each guard one direction while actually all relying on the central coordinating function. Earth has no fixed direction among the Five Phases, just as the four trigrams including Kan and Li assist Qian and Kun in their operation to generate the sixty hexagrams.

The specific arrangement is as follows: from the first to the eighth day of each month, fifteen hexagrams correspond to the blue-green color of spring; from the eighth to the fifteenth, fifteen hexagrams correspond to the red color of summer; from the sixteenth to the twenty-third, fifteen hexagrams correspond to the white color of autumn; and from the twenty-third to the thirtieth, fifteen hexagrams correspond to the black color of winter. This division integrates time, space, and the changes of hexagram images into the system of Yin-Yang and the Five Phases.

This passage primarily discusses the relationship between Yin-Yang transformations in the Zhouyi (Book of Changes) and the workings of heaven and earth. First, it explains how the four colors—azure, red, white, and black—in the Eight Trigrams (Bagua) all originate from the central earth element (represented by the Wuji earth in the Five Phases), which is the subject of Chapter 9.

Chapter 10 uses the movement of the sun and moon as a metaphor for the alternation of Yin and Yang: as the sun sets, the moon rises, cycling endlessly like the turning of a wheel. The Zhouyi contains 384 lines (Yao, the fundamental units of the hexagrams), corresponding to 64 hexagrams. From the last day of the lunar month (Hui) to the first day (Shuo), the Zhen hexagram (symbolizing thunder) becomes active, marking the moment when the vital energies (Qi) of heaven and earth merge, and the sun and moon interact. The masculine Yang energy (represented by the Kan hexagram) disperses dark, mysterious power, while the feminine Yin energy (represented by the Li hexagram) nurtures golden-yellow energy. This state of chaotic intermingling forms the foundation for the growth of all things. As the Dragon-Tiger Scripture states: "The masculine Yang energy is like emerald-black water, while the feminine Yin energy resembles ochre and gold."

Chapter 11, through Confucius’ discourse on Hongmeng (the primordial state of the cosmos), elucidates the Dao of Qian (Heaven) and Kun (Earth). The sages began the upper section of the Yijing with Qian and Kun, symbolizing the way of parents, while the lower section starts with Xian and Heng, representing the way of husband and wife. From the perspective of heaven and earth, when Qian is above and Kun below without interaction, it forms the "Pi" hexagram (obstruction). From the perspective of the human body, if the Li (fire) woman and Kan (water) man do not unite, it results in the "Weiji" hexagram (incompletion). These examples illustrate the principle that solitary Yang cannot generate life, nor can isolated Yin foster growth. Only when heaven and earth unite to form the "Tai" hexagram (peace) and water and fire harmonize into the "Jiji" hexagram (completion) can all things flourish and multiply. Hence, the Book of Songs places Guanju, a poem celebrating marital harmony, at its beginning.

Finally, the text notes that the sages observed celestial phenomena (Tianfu) and followed the laws of Yin-Yang’s advance, retreat, contraction, and expansion to align with the rhythms of heaven. The Zhouyi serves as the core framework for comprehending these heavenly principles.

The workings of heaven and earth correspond with the principles of the Yijing (Book of Changes), and only sages can truly comprehend their profound mysteries.

This passage explains the relationship between the twelve waxing and waning hexagrams (each representing the monthly ebb and flow of yin and yang) and the lunar cycle. The Fu hexagram (Earth over Thunder) symbolizes the initial emergence of yang qi, much like an eldest son inheriting his father's legacy or a mother nurturing new life—showing the first signs of vitality emerging from the pure yin of the Kun hexagram. The waxing and waning of yin and yang resonate with musical harmonics, while their ascent and descent follow the celestial movements of the Northern Dipper.

The moon's phases manifest thus: On the third day, a faint glow appears in the western Geng position, corresponding to the Zhen hexagram. By the eighth day, the waxing crescent in the southern Ding position forms a straight line like a measuring cord, matching the Dui hexagram. At full moon on the fifteenth day in the eastern Jia position, the lunar orb becomes perfectly round like the pure yang Qian hexagram—here both the toad (symbolizing the moon) and rabbit (representing lunar shadows) become visible as solar and lunar qi intermingle. This seven-eight-fifteen day cycle completes before the moon begins to wane.

From the sixteenth day, yin grows while yang recedes—the Xun hexagram manifests in the Xin position. By the twenty-third day's waning crescent, the Gen hexagram appears in the Bing position. On the thirtieth day, the Kun hexagram returns to the Yi position as light fades in the northeast (signifying the moon's disappearance). This cycle then begins anew.

The celestial meeting point of sun and moon is called "chen"—they converge twelve times yearly, always on the new moon (first day of the lunar month), hence termed "the sun and moon joining like jade discs." Since their alignment during new moon may cause lunar eclipses. Both luminaries move counterclockwise through the heavens—the sun advances one degree daily while the moon covers approximately thirteen degrees. By the third day when moonlight first appears, the moon lies about forty degrees from the sun. As the sun sets in the west, the moon receives solar essence—just as pure yin Kun gains one yang line to form Zhen hexagram, appearing in the western Geng position.

By the eighth day, increased distance from the sun strengthens yang qi, forming Dui hexagram as the waxing crescent reaches the southern Ding position. At full moon on the fifteenth during solar-lunar opposition, yang qi peaks to form Qian hexagram with the moon in eastern Jia position. During midnight's Renzi hour at lunar plenitude, yin qi already stirs—this is Li hexagram (though fire-associated, containing yin lines). After the sixteenth day, yin manifests as pure yang Qian gains one yin line to form Xun hexagram. The moon's initial phase determines its corresponding trigram position.

As the moon moves through different celestial positions, its form undergoes corresponding transformations. When the moon first rises, it appears dim (the "po" refers to the moon's dark side). The later it rises, the less its trajectory can be determined by sunset. Thus, the ancients used the sun's rising position to determine lunar phases.

After the 16th day of the month, when the sun is about to rise, the moon reaches the western position of Xin (governed by the Xun trigram in the Bagua). By the 23rd day, as the sun draws near, the moon's bright side (hun) has diminished by half, corresponding to the Gen trigram. When the sun rises, the moon is precisely at the southern position of Bing (governed by the Gen trigram), marking the last quarter moon. The ancients spoke of "near one, far three": the first quarter moon, being closer to the sun, is called "near one," while the last quarter moon, farther from the sun and trailing behind it, is called "far three."

From the 23rd day to the month's end, the yang energy completely recedes, transitioning to the Kun trigram. When the sun rises, the moon is at the eastern position of Yi (governed by the Kun trigram). Here, yin energy reaches its peak, but yang energy has already begun to stir at midnight (the position of Gui) on the last day of the month, corresponding to the Kan trigram (which governs Gui). By the next month, it once again receives the resonance of the Zhen trigram (symbolizing the dragon) at the position of Geng—hence the phrase "the dragon continues its form and is reborn."

(End of Chapter 14)

Ren and Gui pair with Jia and Yi, while Qian and Kun encompass the beginning and end. Seven plus eight makes fifteen, as does nine plus six (the numerology of the Hetu). These four numbers combine to form thirty, symbolizing the completion of yang energy's cycle. The Bagua are distributed like the movement of stars, their central principle never deviating.

The Qian trigram governs both Jia and Ren positions, while the Kun trigram governs both Yi and Gui. Following the horizontal sequence of the heavenly stems, the Kan trigram also governs Gui, and the Li trigram governs Ren. This is because: Qian is pure yang, and at its extreme, it gives rise to a single yin (Li); Kun is pure yin, and at its extreme, it gives rise to a single yang (Kan). Hence the saying, "Ren and Gui pair with Jia and Yi, Qian and Kun encompass the beginning and end." The phrase "yang energy withdraws and hides" refers to the complete transformation into Kun by the 30th day, where yang energy temporarily vanishes—just as the moon is entirely unseen at month's end.

(End of Chapter 15)

The subtle energy (yuanjing) of the cosmic origin is difficult to observe directly; it must be verified through calculation and symbolic correspondences. In stillness, one may observe celestial patterns and analogize their governing principles.

Chapter Sixteen discusses how the practice of fire timing (the crucial moments in Neidan/internal alchemy cultivation) must align with the laws of heaven and earth. First, one must observe celestial phenomena, just as the ancients comprehended the Dao of heaven through the Hetu (the mystical diagram said to have been carried by a dragon-horse). Next, one must examine geographical patterns, like using a gnomon to measure shadows and determine seasonal changes. Finally, one must harmonize body and mind, ensuring actions correspond to the natural rhythms. Only when celestial timing, earthly advantage, and human harmony are aligned can cultivation flow as naturally as the movements of heaven and earth, reaching a state where one shines like the sun and moon and communicates with spirits. This entire process must be approached with utmost care.

Chapter Seventeen illustrates that refining the Golden Elixir (a metaphor for Neidan practice) is akin to governing a state. First, one must grasp the subtle essentials, maintaining clarity of mind as precise as counting. Then, like the North Star guiding direction, one must gather and refine Jing-Qi (vital essence and energy, key terms in cultivation). Once the framework of practice is established, one acts according to the transformations of the hexagrams, and auspicious or inauspicious signs will naturally manifest. The movement of the Five Phases (Wood, Fire, Earth, Metal, Water) should be as orderly as the progression of seasons, and the paths of the twenty-eight lunar mansions (ancient stellar divisions) must not deviate, lest problems arise.

Chapter Eighteen employs the metaphor of a royal court to describe the cultivation system. The Star of Literary Brilliance (a Daoist deity overseeing scholarly fortune) symbolizes the practitioner's guiding consciousness, while the ministers of state represent the Kan and Li trigrams (symbolizing water and fire, yin and yang within the body). The civil and military officials correspond to the remaining sixty hexagrams (of the I Ching beyond Qian, Kun, Kan, and Li). Just as each court department fulfills its specific role, every system in the body must coordinate seamlessly during cultivation.

Chapter 19 discusses the crucial balance of Yin-Yang in alchemical practice. The sun embodies the quintessence of the Five Phases (Wuxing), while the moon follows the rhythm of six musical pitches—their combined thirty-day cycle forms a perpetual rotation. Just as governing a state requires order, if the sovereign (symbolizing the spirit-mind) becomes arrogant and indulgent, disregarding alchemical discipline, or if the ministers (representing internal Qi movements) become disordered and rebellious—like the moon's irregular waxing and waning bringing calamities—the elixir process will fail. Inaccurate measurements or improper fire regulation during refinement will damage the nascent elixir embryo (fetal immortality) gestating within the Dantian (divine chamber).

Chapter 20 details the core principles of Neidan (internal alchemy) practice. The "Polar Star" refers to the Niwan Palace (upper Dantian) at the crown of the head, which governs the body like Polaris ruling the heavens. Practitioners must guide the kidney water (lead of the Kan palace) and heart fire (mercury of the Li palace) to converge here, just as sovereign and ministers perform their respective duties. One inch before the Niwan Palace lies the "Hall of Light," with the three Dantian energy centers (upper, middle, lower) extending deeper within. Practitioners must maintain inner emptiness and stillness, observing the body internally like pearls forming in deep pools while cliffs remain uneroded. Closing the mouth to secure genuine Qi (spiritual root) and harnessing heart fire (energy of five splendors) for refinement are essential. The phrase "three luminaries submerging on land" describes internalizing the combined energies of sun, moon, and stars within the body.

Chapter 21 explains the results of successful Neidan cultivation. When the central spleen-earth (Yellow Center) achieves harmonious circulation, the elixir's potency nourishes the entire body's skin and flesh. Like a tree—only with stable roots (water) can branches flourish. This fundamental water (primordial Qi) remains imperceptible to ordinary people, requiring dedicated practice to perceive. While spleen-earth transforms elixir essences to nourish the five viscera and limbs, ultimate accomplishment depends on preserving this most basic "One" (primordial Jing).

This passage reveals the mysteries of Jing (essence) and Qi (vital energy) circulation within the human body. Upper De (referring to heart fire) and lower De (referring to kidney water) constitute the key to cultivation. The heart corresponds to the Li trigram, located in the upper body containing the "jade liquid" (heart fluid) that can be refined into the Returning Elixir. The kidneys correspond to the Kan trigram, positioned below and containing the "golden liquid" (kidney essence) which can likewise be refined into the Returning Elixir. Gathering jade liquid requires no special practice, but obtaining golden liquid necessitates cultivation through the "furnace" (referring to Dantian practice).

When these two orifices are sealed, the jade liquid descends to the "mysterious palate" (throat region), while the golden liquid rises to the "tail gate" (coccyx area). The golden liquid ascending from below forms the Po (corporeal soul), while the jade liquid descending from above creates the Hun (ethereal soul) - this illustrates the distinction between "being" and "non-being." The Shen De (original spirit) resides between these two orifices, requiring nourishment from golden Qi (kidney essence).

Chapter twenty-three explains the principle of mutual generation among the Five Phases. White represents metal essence, black symbolizes the water foundation - with water serving as the pivot of the Dao. "Lead" (kidney essence) appears black externally but contains golden blossoms within, like an eccentric scholar wearing coarse cloth yet carrying precious jade. The black heaven and yellow earth represent the process of Yin-Yang transformation, where Yin emerges from pure Yang. During conception, human life originates from paternal essence, transforming to create the five organs - with kidneys governing metal essence. When metal essence activates, it requires the "river chariot" (Qi circulation) to transport it to the "mud pellet palace" (crown of the head).

Metal generates water, yet water contains metal - resembling a mother nurturing her fetus. The realm of perfected beings remains profoundly mysterious, appearing both existent and non-existent like objects floating and sinking in deep waters. During cultivation, one must guide essence and energy to their proper positions, each maintaining its designated domain.

(Note: "River chariot" refers to Qi circulation along the Governing and Conception vessels; "mud pellet" indicates the Baihui point at the crown, location of the upper Dantian; "tail gate" is the first of three passes along the Governing vessel, situated at the coccyx)

This passage explains the principles of Qi circulation in Daoist Neidan (internal alchemy) practice. It begins by elucidating the "Metal generates Water" relationship: Metal (representing the lungs) generates Water (representing the kidneys), making Metal the mother of Water. Though the kidneys belong to the Water element, they contain Metal Qi (energy) within them—like a fetus nestled in the womb. This subtle energetic transformation is profoundly mysterious, appearing both tangible and intangible, akin to the unfathomable depths where mysteries float and sink, defying ordinary understanding. When this energy spreads throughout the body, it forms the structures of the five viscera, six bowels, bones, and nine orifices.

Next, it discusses the essential method of alchemical refinement: collecting the white substance (Metal Qi) and, through refinement, transforming it into red (Fire Qi). Though the Dantian (energy center) occupies only a small space, it contains the supreme primordial energy that predates heaven and earth. The human body is like a microcosm—the head represents heaven, while the abdomen represents earth. In the formation of life, the father’s Jing (essence, symbolized by the Qian trigram representing heaven) comes first, followed by the mother’s blood (symbolized by the Kun trigram representing earth). In alchemical practice, the white core (Kan trigram) requires the red outer flame (Li trigram) for refinement, much like an embryo needing the union of parental essence and blood. The cyclical interplay of Yin and Yang Qi (Kan and Li) within the Dantian constitutes an energy more fundamental than heaven and earth.

Finally, it describes the practitioner’s physical state during cultivation: the kidney regions resemble a palace protected by walls, with gateways preventing the leakage of Jing and Qi. Practitioners must maintain mental tranquility, allowing Shen (spirit) and Qi to fill the body. Preserving this essence leads to health and longevity, while losing it results in decline. Cultivators must constantly balance movement and stillness, ensuring harmonious coexistence between Qi and the physical form.

In cultivation practice, preventing the leakage of primordial Qi during sleep requires maintaining inner purity and avoiding improper thoughts in daily life. The balance between movement and stillness is crucial—excessive activity depletes Jing (essence) and Qi, while tranquil nourishment preserves primordial energy.

Here are various erroneous cultivation methods: Some practitioners engage in constant inner observation (a Daoist technique of visualizing internal landscapes with closed eyes), yet their minds remain cluttered with distractions. Others perform ritual pacing of the stars (Daoist ceremonial steps) and calculate celestial stems (Daoist divination), yet become obsessed with auspicious dates. Some forcefully retain semen and stabilize Qi, only to disrupt their innate primordial energy. Certain practitioners abstain from grains relying solely on breath nourishment, yet suffer from digestive disturbances. There are those who refrain from sleep day and night, not even resting during new and dark moons (lunar cycle phases), resulting in physical exhaustion and mental confusion. Still others build altars to worship spirits, becoming elated by illusions they mistake for longevity signs, ultimately shortening their lifespan instead. All these methods violate the natural Dao of the Yellow Emperor and Laozi, distorting cultivation's fundamental principles.

True understanding of cultivation comes from penetrating its essence and practicing diligently day and night. Consistently taking elixirs for three years enables one to achieve fire-immunity and water-resistance, freely controlling physical existence while dwelling in perpetual bliss. When merits reach fulfillment, the Supreme Unity deity (Daoism's highest divinity) summons the practitioner to celestial records, enabling ascension. The Zhouyi Cantongqi scripture contains all essential golden elixir formulas for those who study it profoundly.

Regarding alchemical specifics: The fire phases recorded are absolutely truthful, explicable through Yijing principles. The furnace resembles a half-moon, with White Tiger (lead's essence) as its refining core. Mercury flows like luminous pearls, harmonizing with Azure Dragon (mercury's essence). When eastern and western Qi mechanisms interact, the Hun and Po (Yin-Yang energies) naturally fuse. During the waxing moon, use eight taels (ancient measurement) of lead; during waning, eight taels of mercury—their union mirrors Qian and Kun completing the cosmic cycle. This weight corresponds to the Yijing's 64 hexagrams and 384 lines, as one tael equals 24 zhu, totaling 384 zhu for sixteen taels. The so-called White Tiger actually represents true lead within the Kan trigram (Yijing symbol), requiring half-moon furnaces to extract its quintessence.

This passage elucidates the mystery of "gold and fire mutual refinement" in Neidan (internal alchemy) practice. Here, "gold" refers to the true Jing (essence) within kidney water (the liquid within Kan ☵), while "fire" denotes the luminous Shen (spirit) within heart fire (Li fire ☲). When these two converge in the Dantian (the alchemical furnace), it resembles pure gold cast into fierce flames—the longer the refinement, the purer the result.

The crux of cultivation lies in the "dragon-tiger copulation": the Azure Dragon represents the liver's Hun (mercury dragon), while the White Tiger symbolizes the lung's Po. When the Shen (spirit) and Qi descend from the Niwan Palace (upper Dantian) in the crown, pass through the Jade Pool (mouth cavity), and meet with the ascending Qi of kidney Jing at the Mysterious Feminine Gate (Dantian), it mirrors the union of the Eastern Azure Dragon and Western White Tiger. Thus, Hun and Po naturally blend within the body's alchemical furnace.

The text employs lunar phases as metaphors for cultivation: during the new moon (Shuo Dan), receiving sunlight ("solar talismans") resembles kidney Jing being illuminated by heart Shen to facilitate growth. By the moon's dark phase, though seemingly lightless, sunlight is already gestating within—just as the seed of Li fire (☲) is concealed within Kan water (☵). At this stage, though the Golden Elixir (Neidan) remains hidden, its intrinsic power grows stronger.

A crucial warning for practitioners: failure to master gold-fire refinement properly leads to what the Huangting Jing (Yellow Court Scripture) calls "leaves falling from withered trees"—leakage of Jing and Qi resulting in physical decay. Only by adhering to the principle of "establishing foundations before refinement"—like a tree first growing its trunk before branches—can one restore the Golden Elixir's radiant potency.

This passage explains the Yin-Yang and Five Phases principles in Daoist alchemy (Neidan) along with cultivation methods. The phrase "Zi and Wu's numbers combine to make three, while Wu and Ji are called five" refers to the union of Zi (Water) and Wu (Fire) energies forming three, with Wu-Ji (central Earth) representing five. When these three harmonize, they can balance the eight alchemical ingredients (the Eight Minerals).

During practice, one must coordinate breathing naturally, like the conjugal union of husband and wife. The Yellow Earth (spleen essence) generates Metal (lung essence), while the Flowing Pearl of the Sun (also lung fluid) produces Kidney Water (Kan's Water). However, Kidney Water is prone to suppression by Yin energy and requires regulation by the Vermilion Bird (heart fire). When Water and Fire achieve mutual nourishment, the three natures of Metal, Water and Fire among the Five Phases return to their source, as if sharing a common ancestor.

Specifically: The Kan trigram (☵) represents Water with the number one; the Li trigram (☲) represents Fire with the number two - their sum is three. Wu belongs to Yang Earth, Ji to Yin Earth, and Earth's number is five, hence "three-five." This resembles marital harmony that can blend the eight precious materials (Eight Sublime Elements). Cultivation requires synchronizing breath with the sun and moon's movements - exhaling at sunrise and inhaling at moonrise.

The text then explains human embryogenesis: During fetal development, the father's essence (Jing) forms the foundation for the five organs, meaning their Five Phase attributes all originate from Kidney Water (paternal essence). This section particularly emphasizes the importance of Yin-Yang balance, where the mutual nourishment of Water and Fire sustains vital force.

The latter part describes elixir consumption effects: Sesame (Jusheng) prolongs life, while ingesting the Golden Elixir (Jindan) grants longevity. Since gold's nature never decays, alchemists who ingest it achieve enduring life. Earth Qi circulates through the four seasons (Chen, Xu, Chou, and Wei months), maintaining cosmic order. After the Golden Elixir enters the body, its potency spreads like wind and rain, steaming through the limbs, making one's complexion glow, turning white hair black, regrowing lost teeth, and reversing aging. The mentioned "golden sand" refers to refined elixirs, while the "five interiors" denote the organs. The entire cultivation process involves ingesting elixirs while coordinating breathing techniques to restore the body to its primordial Yang state.

This passage discusses the core principles and common misconceptions in Daoist alchemy. It begins by describing the rejuvenating effects of cultivating the "Returned Elixir" (Huandan in Neidan terminology, referring to the refined essence obtained through practice): the elderly regain youthful vigor, old women transform into maidens, and by altering physical form, one transcends worldly suffering—such individuals are called "Perfected Persons" (Zhenren).

The text emphasizes that the key to alchemy lies in mastering the application of the "Kan and Li" trigrams (two of the Eight Trigrams [Bagua], representing water and fire). During alchemical practice, the "metal" from Kan (symbolizing original essence [Jing]) and the "cinnabar" from Li (symbolizing original spirit [Shen]) are refined within the furnace and cauldron. Like mist nourishing the internal organs, this process can reverse aging. The fundamental principle behind this effect is "returning things to their origin"—just as lead white reverts to lead when smelted, or ice and snow melt into water when heated, alchemy similarly restores substances to their primordial state.

The passage then critiques the erroneous practices of contemporary alchemists: many talented scholars disregard natural laws, haphazardly combining materials (such as qiangshidan, mica, or sulfur) and employing incorrect methods (like firing Yuzhang clay or bellows-forging), resulting in wasted resources and repeated failures. The author stresses the necessity of following the principle of "like attracts like." Just as millet seeds are needed to grow millet, or eggs to raise chickens, alchemy requires compatible materials. Otherwise, it becomes as absurd as expecting sparrows to give birth to phoenixes or foxes to nurse foals.

Finally, the text asserts that cultivation must adhere to the "Way of Kan and Li" (the principle of harmonizing Yin and Yang) and cannot defy natural laws. Just as water does not flow upward nor fire burn downward, practice must align with the inherent nature of substances.

This scripture addresses three key aspects:

The first passage cautions practitioners: Those who seek clever shortcuts will only become more foolish, and relying on luck will never lead to true understanding. From youth to old age, doubts easily arise midway, causing one to stray from the Dao (the Way) and take wrong paths. It's like viewing the sky through a bamboo tube—the narrow perspective makes foresight impossible. Without sufficient wisdom, one shouldn't presume to grasp the truth, lest those with clear vision laugh in derision.

The second section recounts the transmission of the Zhouyi (Book of Changes): The greatest sage Fu Xi first created the Bagua (Eight Trigrams), modeling them on the patterns of heaven and earth. King Wen of Zhou then expanded these into the sixty-four hexagrams with their line statements. Confucius later composed the Ten Wings to elucidate them. These three sages arose in succession, each contributing equally though differently, meticulously refining every detail. Tangible things are easy to comprehend, but intangible portents defy prediction. Their writings became models for later generations.

The third part reveals alchemical essentials: The fire phases are recorded in six hundred sections (actually representing ten months excluding February and August, with sixty hexagrams calculated monthly). The Dao of heaven (the hidden) and human affairs (the manifest) are fundamentally one. The author dares not lightly disclose celestial secrets, yet fears the Dao methods may be lost, so presents the essentials concisely. In alchemy, metal (jin) must be used as a dike to control water (shui), with precise proportions (fifteen parts metal to fifteen parts water, the latter slightly exceeding by five). The true Golden Elixir must be pure as primal gold—only when the three (metal, water, and fire) combine can miraculous transformation occur, with yang qi steaming beneath.

This passage discusses the timing and fire regulation in the alchemical process. During Neidan (internal alchemy) practice, one must observe the formation pattern of the "yellow carriage" (referring to the yellow substance produced during refinement), which first appears as liquid before solidifying. In temporal calculations, a month is divided into three ten-day periods. During the first five days, one gathers the "metal" (yang essence from the Kan trigram), followed by five days collecting "water" (yin essence from the Li trigram, also called "divine water from the jade pond"). The remaining twenty-three days require no gathering.

Fire regulation divides into yin and yang phases, requiring skillful adjustment. "Metal" represents yang qi from Kan, while "water" signifies yin qi from Li. The year culminates in the twelfth month (corresponding to Kun trigram), the month concludes at its darkening phase (month-end), and the day ends at the Hai hour (9-11 PM). At these temporal nodes, yang fire extinguishes naturally, demanding special attention. In alchemical practice, one day's error equates to losing a year's lifespan, a month's mistake to ten years, and a year's misstep to a century.

This section details concrete alchemical operations. First, pulverize and mix various medicinal substances, then place them into the crimson-gated alchemical cauldron, ensuring airtight sealing. Maintain furnace fire day and night without interruption—begin with gentle fire (wenhuo), concluding with vigorous fire (wuhuo), while carefully observing temperature adjustments. After twelve two-hour periods (one day) of cyclical fire regulation, when qi approaches exhaustion and fire nears extinction, the elixir takes form. At this stage, the hun and po (essence of medicinal substances) transform into purple hues, ultimately yielding the miraculous huandan (reverted elixir). A single pellet (measured in ancient minute units called daogui) of this substance possesses extraordinary efficacy.

This passage explains alchemy through the mutual generation and restraint of the Five Phases. By regulating the dynamic interaction between water and fire (where water overcomes fire), akin to the moon and sun's mutual stimulation during lunar conjunction (month-end and new moon). When water's power peaks (Kan trigram governing water), it suppresses excessive fire. The entire process adheres to principles of simplicity, avoiding unnecessary complexity. The crux lies in mastering the equilibrium point of water-fire harmony, mirroring the natural rhythms of celestial bodies' movements.

When the yang fire of the sun weakens, even daylight becomes dim. The mutual nourishment and interaction between yin and yang qi represents the natural order of cosmic operation. The moon itself does not emit light but relies on the sun for illumination. When the moon reaches its darkest position (the last day of the lunar month), it fully manifests the Kun trigram (pure yin), yet the Kan trigram (yang line) is already gestating within it. Therefore, during the transition between the waning and new moon, the moon may sometimes eclipse the sun's radiance. This phenomenon gives rise to the Daoist cultivation principle of "using water to stimulate fire"—where Kan water (moon) eclipses Li fire (sun), causing daylight to dim and form a solar eclipse, demonstrating the natural law of yin-yang interaction.

This passage explains the content of Chapter 39. Names serve to determine the essence of things, while words describe their characteristics. Only when metal (representing primordial qi) returns to its original nature can it be called the Reverted Elixir (another name for the Golden Elixir). I dare not make presumptuous claims but merely follow the literary style of ancient sages. Ancient texts record the Yellow Emperor's refinement of golden splendor, King Huainan's alchemical preparation of autumn stone, and Wang Yang's method of adding "yellow sprouts" (an alchemical term). Virtuous practitioners can persevere in cultivation, while those of improper character cannot walk this path. The principles of Daoist cultivation remain consistent through the ages, as clear as face-to-face conversation. Seekers of the Dao should redouble their efforts and contemplate these essential meanings deeply. The most profound truths are actually remarkably straightforward—plain and honest without deception.

Names correspond to substantial entities, while words express abstract concepts. What has form is po (yin energy), manifesting emotions; what lacks form is hun (yang energy), embodying original nature. Only the Golden Elixir, when refined through proper fire phases, can return to its original nature and complete the elixir. Although the profound meaning of the Golden Elixir requires heartfelt contemplation, its principles are not obscure—through diligent study, one will naturally comprehend them.

This passage explains the principles of Yin-Yang transformation in alchemical practice (neidan) and how to regulate the "fire times" according to celestial cycles. The core teachings can be understood as follows:

Qian and Kun (symbolizing heaven and earth as fundamental forces) interact dynamically—Yang governs movement while Yin governs stillness, just as the pairing of male and female principles generates all things. Kan and Li (representing water and fire) form the crux of alchemical work; their transformations are profoundly mysterious, with even sages only able to approximate their patterns.

During the waxing moon (1st to 15th lunar days), Qian encompasses Kun as Yang energy gradually increases; the waning moon (16th to 30th days) shows Kun encompassing Qian with Yin energy growing dominant. Just as the moon borrows sunlight to shine, alchemical practice requires precise attunement to these Yin-Yang fluctuations.

In cultivation, the mind should mirror an enlightened ruler governing a state—issuing commands in harmony with cosmic rhythms, much like an emperor's decree from the palace resonates across the realm. Practically, the Zhun hexagram corresponds to the midnight (Zi) and late afternoon (Shen) hours, Meng hexagram to dawn (Yin) and dusk (Xu), with each of the sixty-four hexagrams having specific temporal associations.

Fire regulation follows meticulous timing: each day divides into two phases, with two hexagrams governing each. At Zi hour (11pm-1am) when Yang first emerges, apply "single Yang fire"; at Chou hour (1-3am) with two Yang lines, use "double Yang fire," progressing until Si hour (9-11am) when "sixfold Yang fire" (full Qian hexagram) is reached. Each "count" of three stokes represents one Yang line—thus six counts (eighteen stokes) complete the Qian hexagram. At Wu hour (11am-1pm) when Yin emerges, begin reducing the fire until total cessation at Hai hour (9-11pm). This mirrors the eightfold transformations of Yin-Yang to forge the golden elixir (jindan).

This passage mainly discusses the use of the Zhun (Tun) and Meng hexagrams in the Zhouyi (Book of Changes), as well as the choice of timing for the fire phase (huohou) in cultivation.

Regarding the Zhun hexagram (the image with Kan above and Zhen below), its corresponding double-hours are Zi and Shen. The Zhen trigram begins at the Gengzi hour, and the Kan trigram then begins at the Wushen hour. The Meng hexagram (the image with Gen above and Kan below) corresponds to the Yin and Xu hours: the Kan trigram begins at the Wuyin hour, and the Gen trigram then begins at the Bingxu hour. This shows that each hexagram has its own specific correspondence with the double-hours.

In the course of a day, the sixty hexagrams are distributed through the twelve double-hours, and when they are used each has its own order of precedence. But within one day, no more than two double-hours are used to practice the fire (the control of fire timing in Neidan cultivation); therefore, the two hexagrams Zhun and Meng are mainly used to represent this.

Chapter 43 says that from the first to the fifteenth day, as the moon gradually waxes, one should “apply benevolence” (adopt a gentle mode of cultivation); from the sixteenth to the thirtieth day, as the moon gradually wanes, one should “establish punishment” (adopt a strict mode of cultivation). In cultivation, one must strictly observe the double-hours and carefully watch the changes in celestial phenomena; the slightest deviation will bring misfortune.

Later it discusses the key points for cultivation at the two solstices (winter solstice and summer solstice) and the two equinoxes (spring equinox and autumn equinox): the winter solstice corresponds to the Zi hour and symbolizes the first arising of yang Qi, so the fire timing should be light; the summer solstice corresponds to the Wu hour and symbolizes the first arising of yin Qi, so the fire timing should be reduced. The spring equinox is at the Mao hour, and the autumn equinox at the You hour. In the month of the winter solstice, one practices the fire timing only once each day at the Zi hour; other months are similar. For example, from the first to the third day of the month, one practices the fire in the early morning at the Zi hour; from the evening of the third day to the fifth day, one practices the fire at the Chou and Hai hours; from the sixth to the eighth day, one practices the fire in the early morning at the Yin and Xu hours.

This passage mainly explains how, in Daoist Neidan (internal alchemy) cultivation, one adjusts the timing and intensity of the fire timing according to hexagrams, lunar phases, and solar terms, emphasizing strict conformity to natural laws.

From the evening of the 8th to the 10th day of the lunar month, practitioners should cultivate during the Mao (5-7 am) and You (5-7 pm) hours. From the 11th to the 13th, morning practice shifts to the Chen (7-9 am) and Shen (3-5 pm) hours. From the evening of the 13th to the 15th, the optimal times become Si (9-11 am) and Wei (1-3 pm).

Between the 16th and 18th, morning practice concentrates solely at the Wu hour (11 am-1 pm). From the evening of the 18th to the 20th, the Si and Wei hours are resumed. The 21st to 23rd mornings return to Chen and Shen, while the evening of the 23rd to the 25th reverts to Mao and You. The 26th to 28th mornings shift to Yin (3-5 am) and Xu (7-9 pm), and from the 28th to the month's end, practice occurs during Chou (1-3 am) and Hai (9-11 pm). This illustrates the principle mentioned in Chapter Five: "The application of timing distinguishes between early and late."

As for cultivation during the initial growth of Yang energy in the twelfth month, it similarly follows the waxing and waning patterns of Yin-Yang. From the first stirrings of Yang to its peak at six Yang lines, the process can be understood and mastered through this principle.

Chapter Forty-Four emphasizes aligning practice with natural rhythms. Movement and stillness must follow orderly patterns, as precise as a carpenter's straightedge. The turning seasons should harmonize with their respective energies, resonating with the Qi of Heaven and Earth. Firmness and softness must remain distinct without confusion, while the Five Phases (Wood, Fire, Earth, Metal, Water) maintain their positions without arbitrary addition or subtraction. Only then can cultivation flow unimpeded as described in the Yijing (Book of Changes), bending and extending with natural ease.

The phrase "in accord with Qi" refers to practices like the first-stage fire technique during the Zi hour (11 pm-1 am), when the first Yang energy emerges. Even during rare alignments of moon phase, hour, and solar term, one must progress gradually without haste. Forcing fire techniques during Chou or Yin hours, for instance, would cause harm—these hours lack the corresponding second or third Yang energies, violating the laws of Yin-Yang harmony.

Chapter Forty-Five describes the unique state during the conjunction of the lunar month's end and beginning (Hui-Shuo). Here, Yin and Yang remain undifferentiated, resembling the primordial chaos of creation, where masculine and feminine energies intermingle. At this time, essence (Jing) and Qi nourish like sweet dew, and the work of creation proceeds spontaneously—its celestial mysteries beyond human reckoning. Practitioners should stabilize body and mind, acting with subtlety.

The directional practice begins in the northeast (aligned with the Ji and Dou lunar mansions), then rotates clockwise. During this process, true Qi circulates like a turning wheel—inhaling and exhaling vitality, yet also concealing life-force like a deep pool's undercurrent, ultimately radiating refined brilliance.

Throughout the lunar cycle from new moon to waning crescent, fire regulation must be precisely measured. Particularly during the nebulous phase between the first and last quarters, when Kan (Water) and Li (Fire) energies mutually nourish and flow, the Chou and Yin hours—corresponding to the Ji and Dou mansions in the celestial dome—are most auspicious for gathering primordial Qi.

This passage explains the principles of Yin-Yang energy circulation within the human body during Daoist Neidan (internal alchemy) practice, using imagery from the Zhouyi (Book of Changes) and celestial phenomena to illustrate the cultivation process.

First, let's clarify key concepts: Kan-Li (representing the body's water and fire energies), Zhen-Dui-Xun-Gen (four trigrams symbolizing different energetic states), and the six lines (yao) of a hexagram representing progressive stages. During cultivation, the movement of Yang Qi (vital energy) follows cyclical patterns like the moon's waxing and waning.

When energy circulates counterclockwise (the "reverse cycle"), it absorbs lunar essence (Yin energy) while releasing solar essence (Yang energy). The latent energy within resembles the harmonious interplay of Kan and Li palaces (the water-fire equilibrium). The celestial vibrations in the Mao and Bi constellations (two of the twenty-eight lunar mansions) signal the awakening of Yang Qi, akin to the "hidden dragon" of the initial ninth line (representing nascent Yang energy).

During practice, Yang Qi begins vibrating on the third day, reaches the Dui trigram (joyous state) by the eighth day, and manifests as the "visible dragon" in the second line by the ninth day. By the fifteenth day, the Five Phases energies complete their cycle, forming the pure Yang Qian trigram. However, excessive expenditure at the third line (third stage) causes energy depletion, requiring adjustment through the Xun trigram (the way of yielding).

The twenty-third day marks a critical juncture where practitioners must exercise Gen trigram-like stillness, avoiding excessive energy extraction. The fifth line represents the supreme "soaring dragon" state of fulfillment. Ultimately, the exhausted Yang energy at the top line returns to Kun trigram (pure Yin), completing the cycle.

The "Xuanji" mentioned refers to ancient astronomical instruments, here symbolizing the body's internal energy fluctuations. Yang Qi ascends while Yin Qi descends, circulating through the six lines to generate sixty hexagram variations. This dynamic interaction between Yin-Yang and hardness-softness constitutes the fundamental principle of the Yijing (Book of Changes).

The entire cultivation process must align with these natural rhythms, requiring celestial observation-like precision in timing—neither premature nor delayed. Each stage corresponds to specific trigrams, demanding practitioners to adjust according to their individual conditions.

This passage uses the changing hexagrams of the twelve months as a metaphor for regulating the fire timing (huohou) during alchemical practice (Neidan, internal alchemy). Each month corresponds to a different hexagram and state of Yin-Yang waxing and waning; practitioners must adjust their cultivation methods according to these natural patterns.

The first lunar month (Zi month) corresponds to the Fu hexagram. Yang Qi has just begun to sprout, like the initial establishment of the pitch of Huangzhong (the first of the twelve pitch standards); this bit of Yang Qi must be nurtured gently. The second month (Chou month) corresponds to the Lin hexagram; Yang Qi gradually strengthens, rising steadily like the Dalü pitch.

The third month (Yin month) corresponds to the Tai hexagram, where Yin and Yang are balanced and converge, and energy circulates smoothly. The fourth month (Mao month) corresponds to the Dazhuang hexagram; falling elm pods symbolize return to the root, and at this point one must pay attention to the balance of punishment and virtue (Yin and Yang). In the fifth month (Chen month), Yang Qi is flourishing like the Guai hexagram, and impurities need to be cleared away.

The sixth month (Si month) corresponds to the Qian hexagram, when Yang Qi reaches its peak. But when the Gou hexagram appears in the seventh month (Wu month), Yin Qi begins to sprout, like a cold spring at the bottom of a well. The eighth month (Wei month) Dun hexagram suggests gathering and restraining Jing and Qi. The ninth month (Shen month) Pi hexagram shows Yin and Yang blocked off from each other.

In the tenth month (You month), with the Guan hexagram, one should pay attention to the balance of the autumn harvest, as old trees and new shoots replace one another. The eleventh month (Xu month) Bo hexagram symbolizes the dissolution of form. The twelfth month (Hai month) Kun hexagram returns to the root and accords with natural patterns.

It is particularly noted that during the three months of Mao (second month), You (eighth month), and Hai (twelfth month), one should suspend the use of fire timing, because according to Five Phases theory, fire Qi is in a declining state during these three months. The entire cultivation process is like the operation of heaven and earth: Yin-Yang cycles back and forth, from chaos to order, all of which is the manifestation of the Dao of nature. Practitioners must comply with the rhythms of these Yin-Yang changes in order to achieve the desired results.

This passage elucidates the principle of Yin-Yang interaction in Daoist Neidan (internal alchemy) practice. Like the unbroken lineage of imperial succession that endures for millennia, the seemingly distant Kan (Water) and Li (Fire) trigrams—though superficially disconnected—maintain hidden channels of mutual resonance. The text employs the waxing (7th-8th lunar day) and waning moons (22nd-23rd lunar day) as metaphors for the cyclical growth and decline of Yin-Yang: the root of Yin resides in the Li trigram (Fire), while the origin of Yang dwells in the Kan trigram (Water). Practitioners must note that the Yin qi of Li never initiates movement spontaneously—thus during the waxing moon, one cultivates Yang qi first, then nurtures Yin qi during the waning phase. This mirrors the traditional household dynamic where the husband governs external affairs while the wife oversees domestic matters.

Regarding methods for nurturing spiritual nature (Xing) and prolonging life (Ming), one must recognize that human life originates from primordial emptiness. When original Jing (essence) begins its distribution and Yuanqi (primordial qi) forms the embryonic foundation, all bodily structures—the hundred bones and nine orifices—become fully constituted. The alchemical process precisely emulates this natural generative sequence.

Yin-Yang serves as the measure for cultivation, with Hun (Yang spirit, resembling the sun) and Po (Yin spirit, mirroring the moon) existing in mutual dependence. The Hun, being Yang, resides internally to shape one's innate character; the Po, as Yin, governs external form and physical appearance. When inner and outer achieve harmony, human consciousness connects with heaven and earth: the Qian trigram (Heaven) in motion facilitates qi circulation, while the Kun trigram (Earth) in stillness becomes the dwelling place of Dao. The vigorous qi disperses after fulfilling its function, while the yielding qi transforms to nourish life. Through the alchemical cycles of "nine revolutions and seven returns" (Jiuzhuan Qifan), metal (lungs) and fire (heart) fuse, while water (kidneys) and fire achieve balance. Water represents the foundation of the Five Phases, with its purest form embodying Dao's essence—yet the "True One" (Zhenyi, primordial qi) remains elusive, inevitably differentiating into myriad independent manifestations.

From the perspective of "fire times" (huohou, cultivation timing), the interaction between solar Hun and lunar Po follows precise rhythms of advance and retreat. Regarding the union of Kan and Li, the Kan trigram (kidney essence) requires the nurturing influence of Li (heart-mind) to form the golden elixir. Physiologically, all organs depend on the nourishment of Five Phases qi for longevity. Thus, fire, qi, and Shen (spirit) constitute the essential nature of Hun, while physical form relies entirely on these refined energies for sustenance.

This passage elucidates the relationship between the ethereal soul (hun) and the corporeal soul (po) and their cultivation principles. The hun (spiritual consciousness) requires the po (physical energy) as its foundation, just as the po becomes a useless shell without the hun. External emotional activities manifest through the po's function, while intrinsic nature operates through the hun's function.

Using Heaven-Earth and Yin-Yang as metaphors: Qian (Yang) governs movement and direct action, resembling the flow of essence-energy (Jing-Qi) during male intercourse; Kun (Yin) governs stillness and containment, like a woman nurturing an embryo. After vigorous Yang energy is expended, it diminishes, while gentle Yin energy becomes increasingly nourishing. Practitioners follow the same principle through the method of "Nine Returns, Seven Reversions, Eight Homecomings, and Six Dwellings":

"Nine Returns" refers to nine years of complete cultivation, symbolizing the nine-month gestation cycle. "Seven Reversions" means returning lead-mercury (essence-energy), dragon-tiger (Yin-Yang), and blood-Qi-Shen to the three Dantian (the body's three energy centers). "Eight Homecomings" accumulates eight liang (ancient measurement) of essence-energy monthly, storing over eight hundred liang in the Dantian after nine years. "Six Dwellings" cultivates the six energies (three Yin-Yang pairs) generated between Heaven and Earth, nurturing them in three stages within the lower, middle, and upper Dantian.

Chemical metaphors are employed: the male's white represents metal-essence within the Kan trigram (Water), while the female's red represents cinnabar within the Li trigram (Fire). The mutual nourishment of water and fire resembles the precise control of firing in alchemy, where supreme goodness mirrors the Yin energy within Li Fire. From the Dao generating the One, the Yang energy within Kan Water transforms, enabling the five viscera, six bowels, bones, and nine orifices to each find their proper place.

Chapter 64 describes the embryonic formation process: initially the size of a hen's egg with black-white Yin-Yang embracing, approximately one cubic cun (inch). Through ten months of gestation, limbs and organs gradually form; at birth, bones remain soft and pliable, skin smooth as lead (describing neonatal state). Quoting the Classic of Difficulties, human development indeed begins from this one-cun embryo, corresponding with the earlier "eight liang" essence-energy concept.

Later sections employ natural phenomena as metaphors: just as the yangsui (ancient burning mirror) cannot produce fire without sunlight, or the fangzhu (ancient dew collector) cannot gather dew without moonlight, the mysterious interaction between Heaven-Earth's Yin-Yang energies demonstrates mutual resonance and transformation. Practitioners should accordingly harmonize their own proximate Yin-Yang energies to facilitate internal alchemical changes.

Note: The measurement "liang" here refers to an internal alchemy (Neidan) term quantifying essence-energy, not actual weight.

This scripture elucidates the core methods of Daoist Neidan (internal alchemy) practice, which operates on both internal and external levels:

In internal cultivation, the human body mirrors a microcosm. The heart serves as its central axis. The Kan trigram (representing Water) corresponds to the moon and ears, the Li trigram (representing Fire) to the sun and eyes, while the Dui trigram governs the mouth. Practitioners must seal these three orifices: closing the eyes, covering the ears, and shutting the mouth to contain Shen (spirit) and Qi (vital energy) within. The specific method involves relaxing the body during sleep while maintaining mental focus, allowing internal energies to flow like spring rain—circulating naturally from crown to soles in continuous cycles.

The text particularly emphasizes two profound principles: "Reversal manifests Dao's efficacy"—where elders rejuvenate through practice, demonstrating the Way's transformative power; and "Yielding embodies De's essence"—where humility and retreat paradoxically earn reverence, revealing Virtue's fundamental nature. Just as farming requires weeding before sowing, cultivation demands clearing mental distractions to facilitate the unimpeded flow of Jing (essence) and Qi.

Externally, practitioners should "blend radiance with dust"—harmonizing with worldly affairs while concealing spiritual brilliance—as the outward expression of cultivation. The aforementioned techniques of sensory withdrawal constitute the internal practice.

Gradual effects manifest through sustained practice: a ruddy complexion, strengthened bones, complete expulsion of Yin-pathogenic energies, and the natural establishment of pure Yang Qi. The entire process resembles melting snow—with vital energies circulating ceaselessly from head to toe—ultimately culminating in mystical union with the Dao.

Diligently practicing this method allows the body's true Qi to circulate naturally and nourish the entire system. This constitutes the content of Chapter 66.

Many in this world pursue minor techniques without comprehending the profound depths of the Great Dao. Abandoning the true path for deviant shortcuts in hopes of quick results, they instead encounter obstacles everywhere. Like a blind man refusing his cane, a deaf man straining to hear music, diving underwater to catch pheasants, or climbing mountains to hunt dragons - sowing wheat yet expecting millet harvests, using compasses to draw squares - they vainly exhaust their Jing (essence) and Qi (vital energy), toiling year after year without visible accomplishment. In truth, the authentic method of internal nourishment (Neidan practice) is fundamentally simple and uncomplicated.

Those seeking longevity cultivation often lack foresight. Upon grasping some minor technique, they become ecstatic, imagining themselves uniquely enlightened - precisely the manifestation of self-delusion. This forms Chapter 67.

The Solar Flowing Pearl (referring to cranial Jing) tends to dissipate easily, requiring transformation through Golden Splendor (kidney Jing). Their mutual interaction ultimately coalesces into white saliva that crystallizes into the elixir. Golden Splendor acts first, soon melting into watery form. Countless Yang energies (described as "horse-teeth balustrades") naturally harmonize as dispositions blend. When Yin energies constrain and obstruct, it resembles a kind mother nurturing filial children's gratitude, or a stern father instructing descendants. The Five Phases (Wood, Fire, Earth, Metal, Water) interact through mutual generation and restraint - fire melts metal, metal overcomes wood. The numerical pattern of Three-and-Five (representing Five Phase harmony) merges with the Supreme Unity (Taiji) - this constitutes heaven and earth's most exquisite principle, transmissible through oral instruction but nearly impossible to fully capture in writing.

The "sun" denotes the head; "flowing pearls" indicate lung fluids. The Huangting Jing states that among the seven bodily fluids circulating through the forehead region, this particular one dissipates most easily because people universally neglect it. "Golden Splendor" refers to kidney fluids - lungs corresponding to Metal, kidneys to Water, maintaining mother-child generative relationship. "Horse-teeth balustrades" describes numerical abundance. Yang energy represents the solar soul, also symbolizing human innate nature. The kind mother embodies the Kun hexagram (Earth), representing the abdomen that generates and transforms the five viscera's fluids to nourish the whole body. The stern father embodies the Qian hexagram (Heaven), representing the head that requires these five viscera fluids to ascend to the Niwan Palace (crown chakra) for golden elixir refinement. "Fire melting metal" refers to the Li Palace (heart) fluids, best gathered during the waning moon (around the 23rd lunar day), corresponding to autumn's You period (5-7 PM) when Metal Qi peaks. "Metal felling flourishing wood" indicates Kan Palace (kidney) fluids, best elevated during the waxing moon (around the 8th day), corresponding to spring's Mao period (5-7 AM) when Wood Qi thrives. The "Three" denotes heart, lungs and liver; the "Five" signifies Five Phase harmony.

This scripture elucidates the core principles of Daoist Neidan (internal alchemy) practice, using the mutual generation and restraint of the Five Phases (Wood, Fire, Earth, Metal, Water) as metaphors for the cultivation process. It first identifies the spleen (Earth) and kidneys (Water) as crucial for forging the Golden Elixir (Jindan), calling them the "supreme essence of heaven and earth."

During practice, the energy at the hour of Zi (associated with the Water phase in the Kan position) should rotate upward to the right, while the energy at the hour of Wu (associated with the Fire phase in the Li position) should spiral downward toward the east. The positions of Mao (east, Wood phase, symbolized by the Azure Dragon) and You (west, Metal phase, symbolized by the White Tiger) mutually restrain each other, resembling the dragon's exhalation and tiger's inhalation in harmonious interplay. Astronomical phenomena serve as metaphors here: when Mars (Yinghuo) enters the western Metal domain and Venus (Taibai) traverses the sky, this dynamic of mutual restraint resembles a raptor intimidating smaller birds—each element exerts its power while maintaining respectful boundaries.

The text emphasizes aligning cultivation with the Five Phases' natural relationships: Fire melts Metal (Fire restrains Metal), and Metal fells Wood (Metal restrains Wood). The Yellow Court Scripture (Huangting Jing) states that by absorbing the essence of sun and moon through breath, one can balance these restraining forces. Deviation from this principle invites disharmony.

It then explains why countless seekers of the Golden Elixir have failed throughout history: some pursued rare herbs while violating Daoist principles, while others misunderstood the subtleties of Five Phases synergy. True cultivation mirrors these generative and restraining interactions—regulating the "civil and martial fires" (gentle nurturing and intense refining) with the precision of nature's cyclical patterns.

A vivid analogy concludes the passage: just as mutually toxic herbs like wild aconite and croton seeds can paralyze instantly when ingested, so too does the Five Phases' interplay determine success in alchemical practice. The cosmic order operates with the immediacy of a shadow cast by a upright pole or an echo in an empty valley—utterly reliable and unfailing.

(Note: "Flying Golden Essence" refers to the Neidan technique of ascending vital energies; "Yellow Court" denotes a key bodily locus in cultivation; "civil and martial fires" describe the modulation of mental focus during practice.)

Chapter 71 explains the principles of mutual generation and restraint among the Five Phases (Wuxing). Just as setting up a pole inevitably casts a shadow or shouting in a valley produces echoes, the harmonious interaction of the Five Phases (Metal, Wood, Water, Fire, and Earth) naturally leads to the refinement of the Golden Elixir (Jindan). The text employs historical allusions—King Wen of Zhou divining with yarrow stalks, Confucius observing celestial phenomena, Bian Que practicing medicine, and Wu Xian beating ritual drums—to illustrate that external methods alone cannot revive the dead; one must follow the natural laws of mutual generation and restraint among the Five Phases.

Chapter 72 describes the nature of the "Riverside Maiden" (referring to the yin essence within the Li trigram). This vital essence (Jing) disperses when exposed to fire and must be stabilized by "Yellow Sprouts" (the yang essence within the Kan trigram). These two essences attract each other like male and female, naturally uniting inseparably. The text specifically cautions practitioners to keep their mouths closed to prevent the dissipation of essence—here, the "Qi" referred to is not breath but the innate primordial Qi containing the "Water of True Unity."

Chapter 73 uses natural phenomena to illustrate the principle of yin-yang union. Entities lacking yin-yang integration defy natural law, much like a hen cannot hatch eggs alone. The creation of all things in heaven and earth follows the rule of yin-yang pairing, just as fire naturally rises and water flows downward. The postures of sexual union (male above, female below) also arise naturally rather than being artificially prescribed. The relationship between the Kan trigram (symbolizing the moon and masculinity) and Li trigram (symbolizing the sun and femininity) serves as a metaphor: the sun provides energy while the moon reflects light—when yin and yang fall out of balance, anomalies like solar and lunar eclipses occur.

Finally, the chapter mentions key practices from the Yellow Court Scripture (Huangting Jing): "lower humility and upper elevation" refers to gathering Qi in the lower Dantian (Kan position) while expanding it in the upper Dantian (Li position). This facilitates internal yin-yang union, achieving the alchemical state of "fire below and water above" (symbolizing the harmonious interaction of water and fire).

This passage elucidates the essential principles of Yin-Yang harmonization and Neidan (internal alchemy) practice. It begins by comparing the interaction of Yin and Yang to the complementary union of male and female, requiring mutual nourishment. The movements of the solar essence (Sun Soul) and lunar essence (Moon Spirit) must be as precise as fire regulation in alchemy. During the moon's conjunction (at month's end and beginning), when the moon obscures the sun, one should gently release subtle Yang Qi to prevent excessive Yin from damaging Yang energy.

The text then employs the transformations of Metal, Water, Fire, and Earth as metaphors for cultivation. Metal transforms into flowing Water, while Fire transforms into Earth which restrains Water. Practitioners should emulate the dynamic balance between masculine initiative and feminine receptivity, avoiding extremes. The lunar Yin energy (Po) must temper the solar Yang energy (Hun), maintaining moderate temperatures and timely transitions to achieve harmony.

Using cinnabar (representing pure Yang) as symbolic reference, it outlines the Five Phases' correspondences within the body: the Wood-phase liver corresponds to the Azure Dragon (number three), the Metal-phase lungs to the White Tiger (number four), the Water-phase kidneys, and the Earth-phase spleen. These elemental energies intermingle chaotically within the body before ultimately returning to the central palace of Earth (the spleen/stomach region). The heart's Qi constitutes the essence of cinnabar—Metal and Water unite while Wood and Fire accompany, all being intrinsic energies of our physical form.

Celestial imagery further illustrates optimal cultivation timings: the Azure Dragon resides in the East (liver), the White Tiger in the West (lungs), the Vermilion Bird in the South (heart), and the Dark Warrior in the North (kidneys). Natural phenomena like elm leaves falling in February or wheat growing in August synchronize with the celestial movements of the Big Dipper. Practitioners must seize the Yang-growing period from the new moon to full moon (first to fifteenth lunar day), allowing energy to germinate like naturally sown seeds. The numerical pair "one-nine" symbolizes the cyclical nature of Yin-Yang, where primordial Qi circulates between the Void and Rooftop constellations (two stars in the northern Dark Warrior asterism), reaching peak vitality during the Zi hour (midnight).

This passage explains the principle of Yin-Yang interaction in Daoist Neidan (internal alchemy) practice. The metallic Qi from the Water Palace (Kan position, northern region) flows southward. When the moon wanes on the sixteenth day of the lunar month, the medicinal essence (Jing-Qi) from the Fire Palace (Li position, southern region) must be gathered and directed northward—hence the saying "Zi in the south, Wu in the north" (Zi representing the northern direction, Wu the southern).

The dragon (symbolizing Yang) always follows fire, while the tiger (symbolizing Yin) always follows water. When Kan (water) and Li (fire) intersect, metal and wood (Yin-Yang) cannot remain separate—thus the dragon and tiger merge harmoniously. Golden Elixir cultivation primarily relies on the metallic Qi (original essence) from the Kan Palace, ultimately returning to the realm of emptiness, where essence and Qi are dispersed during the Zi hour (midnight).

The text then cites the Book of Songs' "Guan-guan cry the ospreys" to illustrate the natural pairing of Yin-Yang: male birds never dwell alone, nor do females remain solitary. Just as the Black Tortoise (Xuanwu, northern celestial creature) forms through the entwining of turtle and snake, male and female are inherently interdependent. If two women shared a chamber—no matter their beauty—even with silver-tongued persuaders like Su Qin or Zhang Yi weaving eloquent arguments, they could never become spouses, remaining strangers into old age.

Alchemy follows the same principle. With incorrect medicinal ingredients or imbalanced formulas, even if the Yellow Emperor personally tended the furnace, the Great Unity deity controlled the flames, the Eight Immortals pounded herbs, and Prince Huainan himself prepared the mixture—erecting jade altars, offering sacrifices of qilin meat and phoenix jerky, kneeling in prolonged prayer, fasting and purifying for success—it would be as absurd as patching a pot with glue or treating sores with saltpeter. Adding water to quench fire or heat to cool down only creates chaos, like forcing tortoises and snakes to dance wildly.

Since the dawn of creation, Heaven and Earth preceded Yin-Yang; man and woman gave rise to marital union; sun and moon established the hun and po souls; heart and kidneys generated Qi and fluids. The crux lies in the mutual interaction of above and below, the coupling of female and male—this is the Dao of perpetual vitality. How could anything thrive in isolation?

The ancient sages, embracing profound mysteries and upholding the true Dao, cultivated themselves by ingesting the Nine-Cycle Golden Elixir (the highest alchemical medicine in Daoism). They concealed their traces, nourished their Shen (spirit), and merged with the essence of the Three Lights (sun, moon, and stars). Through such practice, their bodily fluids became abundant, their skin texture refined, and their sinews and bones strengthened, enabling them to resist external evils and preserve the pure Qi (vital energy). With prolonged accumulation, they could transcend their mortal forms and attain immortality.

Out of compassion for later seekers of the Dao, these sages recorded the essential teachings in scriptures. Yet they deliberately concealed the core principles behind veiled language, using terms like "various minerals" (a metaphor for alchemical ingredients). As a result, later generations found themselves holding a treasure box they could not open—passing down the teachings through the ages without grasping their essence. Officials neglected their duties, farmers delayed their plowing, merchants abandoned their goods, and aspiring practitioners fell into poverty. Deeply troubled by this, I composed the Zhouyi Cantong Qi (The Seal of the Unity of the Three, in Accordance with the Book of Changes).

Here, I present the key points in clear language: In alchemy, the ratio of lead and mercury (symbolizing Yin-Yang) follows fixed principles, and the advancement and retreat of the fire (temperature control) adhere to specific patterns. I have organized these into systematic guidelines—those with wisdom will contemplate and understand them.

Chapter 79 discusses the laws of cosmic operation: The Celestial River (Mysterious Channel) spans tens of thousands of miles across the heavens. When the Big Dipper points to certain directions, unusual celestial phenomena appear in the human world. If solar shadows remain disordered for nine years, calamities will descend from heaven. At such times, enlightened rulers reflect and reform. Just as sluice gates regulate water flow, ominous Qi dissipates accordingly—when the rivers of Jiang and Huai run dry, they eventually return to the sea. The Yin-Yang (female and male) of heaven and earth alternate at the Zi (midnight) and Wu (noon) hours. The Yin (3–5 AM) and Shen (3–5 PM) hours mark the critical transitions of Yin-Yang, cycling endlessly like the rotation of the Big Dipper. By grasping this pattern, one can discern the fundamental laws of the cosmos.

This passage particularly emphasizes: The so-called "Mysterious Channel" secretly refers to the Ren and Du meridians (Northern River Chariot) within the human body, mirroring the celestial Yellow River circulating internally. Practitioners must emulate the rhythmic movements of heaven and earth to regulate their own Qi and blood.

This passage reveals the mysteries of the "River Chariot Circulation" (the cyclical movement of vital energies within the body) in Daoist Neidan (internal alchemy) practice. The celestial River Drum Star (Altair) corresponds to the lower Dantian (energy center) in the human body (the Kan position), symbolizing masculine Jing (essence) and Qi (vital energy). The celestial division of the Northern Dipper represents the upward journey of internal energies from the northern region (kidney water) along the spine to the Muddy Pellet Palace (upper Dantian) at the crown of the head.

When the practitioner seeks to elevate the "Golden Crystal" (primordial essence), a palpable vibration arises within, much like the measured advance and retreat of a sundial's shadow. This process must be carefully regulated—reckless dissipation would bring calamity akin to the nine-year floods before Yu the Great's taming of the waters.

The Shangqing Zhenren (perfected beings of advanced cultivation) understand this principle well. Here, the Shen (spirit), like a sovereign ruler, must retreat to rectify itself. Should mental focus waver, pathogenic Qi will seize the opportunity to invade. The southern waterways (Yangtze and Huai rivers) correspond to the Yin fluids within the body's Li position (heart fire), flowing from the Jade Pool (saliva in the mouth). Without proper nourishment techniques, vital essence would deplete like rivers draining into the sea.

The cosmic dance of Yin-Yang revolves unceasingly between the Zi hour (midnight, Kan position) and Wu hour (noon, Li position). The Yin hour (3-5 AM) marks both the birth and gathering of fiery Qi, embodying the beginning-and-end principle of the Gen (Mountain) hexagram from the Yijing (Book of Changes). The Shen hour (3-5 PM) witnesses the emergence and concentration of watery Qi, reflecting the creative power of the Kun (Earth) hexagram. Cultivation must follow these celestial rhythms guided by the Northern Dipper.

Chapter 80 allegorically depicts the alchemical process: Above Zhen Mountain (the head), vapors rise and refine while the White Tiger (lung Qi) below guides, the Azure Dragon (liver Qi) harmonizes, and the Vermilion Bird (heart Qi) circles overhead. When encountering "entangling nets" (cultivation obstacles), the situation resembles an infant crying for its mother. Through the crucible of water-fire refinement (the cauldron's boiling), essence-energy shimmers like fish scales, transforming through five-colored hues.

Within the cauldron (Dantian), continuous boiling creates landscapes of interlocking patterns—jagged as wolf teeth or layered like winter icicles hanging from stalactites, each tier supporting the next in endless regeneration. This entire process, ever-shifting and unpredictable, demands precise timing (measured by water clocks) to master its celestial mechanics.

This passage explains the principles of fire regulation and Yin-Yang harmonization in Daoist Neidan (internal alchemy) practice. The cauldron (metal vessel) and steaming apparatus used in alchemy symbolize internal organs: the White Tiger represents lung fluids, the Azure Dragon signifies liver essence, while the Vermilion Bird (heart fire) emits five-colored Qi because the heart belongs to the fire element, manifesting as iridescent radiance.

During cultivation, kidney water (Kan-water) must balance heart fire, akin to the Vermilion Bird being restrained by a net. Only then can heart fire unite with its "mother" - the liver wood (Azure Dragon) - within the cauldron. At the beginning of Zi hour (11pm-1am), gentle fire (wenhuo) should be applied for slow refinement, causing fish-scale patterns to emerge on the elixir's surface. There's no fixed standard for fire intensity; as the heat gradually increases, transitioning to fierce fire (wuhuo) will make the elixir boil violently, forming complex jagged formations resembling stalactites.

Chapter 81 discusses Yin-Yang coordination: when properly matched, they maintain serene harmony. The Azure Dragon (liver wood) corresponds to the sixth degree of the Fang constellation (eastern spring), the White Tiger (lung metal) aligns with the seventh degree of the Mao constellation (western autumn), and the Vermilion Bird (heart fire) matches the second degree of the Zhang constellation (southern noon). Their convergence resembles family reunion, fundamentally representing the two substances of lead (kidney Jing) and mercury (heart Shen), ultimately forming the Three-Five harmony (Five Phases equilibrium).

Directional correspondences: The eastern Zhen trigram's Fang constellation belongs to spring, corresponding to the liver, with number six representing water's completion (kidney Jing); the western Dui trigram's Mao constellation belongs to autumn, corresponding to the lungs, with seven representing fire's completion (heart Shen); the southern Zhang constellation belongs to fire, with two symbolizing Yang energy's zenith. The alchemical key lies in combining lead (six, kidney Jing), mercury (seven, heart Shen), and fire (two, heart fire). When eastern three (liver wood) merges with southern two (heart fire), the Golden Elixir is forged.

This passage explains the principle of "Three Fives Returning to One" (sanwu guiyi) in Daoist Neidan (internal alchemy) practice and the alchemical process. The five human organs correspond to the Five Phases (Wuxing): the lungs in the west belong to Metal (white), the kidneys in the north to Water (black), and the spleen at the center to Earth (yellow). The convergence of these three is called the "Three Fives." Ultimately, all these vital essences (Jing) and energies (Qi) must gather and unify in the Dantian (cauldron).

The Mysterious Female (xuanpin, referring to the Conception and Governing Vessels) and the Tail Gate (weilü, the perineum point) serve as pathways for the movement of Jing and Qi. These energies ascend from here to the Muddy Pellet Palace (niwan gong, the upper Dantian) at the crown of the head, much like placing medicinal ingredients into an alchemical furnace. During practice, one must strictly follow the rhythms of the sun and moon to regulate the "firing times" (huohou, the breathing rhythm).

Upon successful alchemical refinement, white Qi initially forms, gradually turning yellow. The heart's Qi is crimson red, while the kidney's Qi is dark black. These energies circulate internally and externally, ultimately fusing in the Muddy Pellet Palace to form the "First Cauldron"—the initial "elixir head" (dantou), about the size of a millet grain. This is the natural achievement of cultivation, not some deceptive trick. Just as mountain and marsh vapors rise to form clouds and rain, or as parched earth crumbles into dust, these are all governed by natural laws.

The text employs various metaphors to illustrate alchemical principles: like how yeast turns things yellow or indigo produces green, how animal hides boil into glue or fermenting agents brew alcohol, substances of the same kind readily interact. This cultivation method is exquisitely precise and reliable, validated through millennia of practice—like stars following the Milky Way's course or all rivers returning to the sea. Practitioners must repeatedly contemplate its subtleties; upon reaching certain stages, spiritual beings (shenming) will naturally impart revelations, and the mind will suddenly become enlightened.

Finally, it emphasizes that the Dao favors no one, yet always transmits its truths to virtuous sages. Like the moon waxing from new to full, when Yang energy grows, Yin recedes; when Yin flourishes, Yang regenerates. This transformation between Yin and Yang occurs as naturally as wine fermenting or plants absorbing dye.

This passage from the Zhouyi Cantongqi (The Kinship of the Three) primarily explains the correspondence between the Five Phases (Wood, Fire, Earth, Metal, Water) and the Heavenly Stems (Jia, Yi, Bing, Ding, etc.), as well as their application in alchemical practices. It employs the principles of mutual generation and restraint among the Five Phases to interpret the combination of various materials in the alchemical process.

The text describes the pairing of the Heavenly Stems (Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui) with the Five Phases: Jia and Yi belong to Wood with the number three, Bing and Ding to Fire with the number two, Wu and Ji to Earth with five, Geng and Xin to Metal with four, and Ren and Gui to Water with one. Among these, Jia, Bing, Wu, Geng, and Ren are Yang Stems, while Yi, Ding, Ji, Xin, and Gui are Yin Stems. The distinction between Yin and Yang lies in their nature—Yin represents the hidden, while Yang represents the manifest. When the Five Phases are concealed within the five viscera (Daoism associates the internal organs with the Five Phases), they are denoted by Yin Stems; when manifested externally, they are denoted by Yang Stems.

Materials used in alchemy also have corresponding relationships: Jia and Yi correspond to floating and sinking stones (possibly indicating different states of ores), Bing and Ding to civil and martial fire (referring to varying intensities of heat), Wu and Ji to medicinal substances (herbs used in alchemy), Geng and Xin to gold and silver, and Ren and Gui to true lead and true mercury (the two most crucial materials in alchemy). This is the meaning behind the phrase "the five positions interact and each has its pairing."

Particular emphasis is placed on the technique of inverting the Five Phases: under normal circumstances, Metal generates Water, but here it is reversed—Water generates Metal; Wood generates Fire is inverted to Fire generating Wood. This method of inversion represents a unique approach in alchemy. For example, mercury (associated with Water) from the Li Palace (representing Fire) is stored under Ren (belonging to Water), illustrating an application of the Five Phases inversion.

Finally, the text underscores that Wu and Ji always represent the foundational medicinal substances (the basic materials in alchemy), indicating that Earth-phase materials are the most fundamental in the alchemical system. Through this intricate correspondence between the Five Phases and the Heavenly Stems, the passage reveals the theoretical framework of Daoist alchemy.

This passage elucidates several core principles of Daoist Neidan (internal alchemy) cultivation:

The Kan trigram (representing kidney water) governs Wu earth, while the Li trigram (representing heart fire) governs Ji earth—both serve as sources of the "medicinal substances" required for Neidan practice. These "medicines" refer not to ordinary herbs but to the Jing (essence), Qi (vital energy), and Shen (spirit) within the human body.

The patterns of celestial movement (Great Change) and bodily functions (Huang-Lao principles) follow fixed laws. The fire modulation in alchemical practice (furnace work) has precise foundations. The three cultivation paths of Metal, Wood, and Fire ultimately share a common origin. Specifically: Wood (3) and Fire (2) combine to form the number five (one path); Metal (4) and Water (1) combine to form another five (second path); while the spleen's fluids, belonging to Earth, constitute the third five-numbered path. All these ultimately converge at the Muddy Pellet Palace (Niwan, the crown-point crucible).

The human body resembles a tree: the five viscera are its roots, from which branches, stems, flowers, and fruits grow. Just as a tree requires healthy roots to flourish, practitioners must first nurture their internal organs (cultivating Neidan) before advancing to refine the Golden Crystal (external alchemy).

During midwinter (around the winter solstice), all things in nature enter dormancy. As wise rulers retreat in accordance with seasonal cycles and merchants suspend journeys, practitioners should understand: the body is like a tree—the viscera form its foundation, while the generated Jing-Qi manifests as flowers and fruits. When external manifestations wither, greater attention must be paid to nourishing the internal roots. In practice, one should follow the method described in Chapter 22: introducing the refined Golden Sand (purified Jing-Qi) into the five viscera, allowing it to disperse like mist and rain naturally.

The author identifies as a recluse from Kuaiji, comparing himself to decaying wood in secluded valleys—embracing pristine Dao while shunning worldly glory, content with tranquil cultivation. This emphasizes how Daoist practitioners should emulate nature's ways, preserving their fundamental simplicity.

This passage elucidates the principles of how practitioners should conduct themselves in the world and engage in cultivation.

Practitioners should distance themselves from worldly fame and profit, maintaining a mindset of tranquility and detachment. The author composed these words during contemplative solitude, distilling the essential teachings of the Yi Jing (Classic of Changes) transmitted by the three sages Fuxi, King Wen, and Confucius. This classic encompasses all phenomena, connecting with the Dao of heaven above, penetrating earthly principles below, and harmonizing with human affairs in between. Whether governing the world from high position, cultivating the body in seclusion, or transcending worldly dust to pursue longevity, all fundamentally follow the same path.

Chapter 88 points out that the key lies in following natural laws. When spiritual energy (Shen) is abundant, one becomes attuned to all things, bringing peace to the world. These principles remain unchanged through all ages, as seen in the health preservation methods of the Yellow Emperor and Laozi. The most precious resources for cultivation reside within our own hearts, never departing from ourselves. By holding to the fundamental principle (embracing the One, Bao Yi) and complementing it with dietary practices, one can achieve longevity. As for mineral-based medicines like the "Eight Minerals of Wudu," they can actually be discarded.

Chapter 89 emphasizes that truly valuable things often appear simple in form. Though the myriad things have different names, they all originate from the same root. Though this "Zhouyi Cantong Qi" (The Kinship of the Three) employs concise language, its meanings are profound and should be followed by later generations. Practitioners should avoid calamities, retreating to mountain forests to wander freely between heaven and earth. Ultimately, one may reach the state of dwelling alongside spirits and attaining feathered ascension (Yuhua Dengxian), roaming carefree through the human realm for hundreds of generations.

The term "embracing the One" (Bao Yi) refers to an essential Daoist practice of maintaining single-minded concentration of spirit. The "Eight Minerals of Wudu" denote eight mineral-based medicines commonly used by ancient alchemists. "Feathered ascension to immortality" represents the highest goal of Daoist cultivation - shedding the mortal body to transform into an immortal form.

This passage elucidates the key principles of Neidan (internal alchemy, the Daoist practice of cultivating Jing, Qi, and Shen) and the structure of the symbolic cauldron (representing the human body as an alchemical vessel).

The text begins with a botanical metaphor for cultivation dangers: Just as trees leaning southward face calamity when water distribution becomes imbalanced—causing withering leaves and loss of vitality—practitioners must support each other to maintain stability for longevity. True value resembles ripe fruit; if worldly people comprehend its essence, they recognize it as priceless treasure, remaining unmoved by mundane fame and profit.

The "three principles" refer to the "three fives" (metal, wood, water, fire, and earth among the Five Phases). Though named differently, they all reside within the human body. All cultivation begins at the Muddy Pellet Palace (the crown point), but practitioners must master self-preservation techniques to avoid disasters. Sometimes one must retreat like hermits dwelling in mountain valleys, other times roam the celestial void as neighbors with spirits—these are methods of reclusive cultivation. Otherwise, practitioners risk withering like plants in drought or flood. Thus Dao cultivators must choose like-minded companions.

The subsequent "Cauldron Song" details the alchemical vessel's structure: A circular diameter of one chi five cun (ancient Chinese measurement), with a five-cun hollow center called the Great Unity Furnace (symbolizing heaven and earth), shaped like the mythical Penglai paradise. The furnace walls are one cun one fen thick, the mouth circumference three chi two cun, the rim two cun high, and the total height one chi two cun with uniform thickness. The furnace belly divides equally into upper, middle, and lower sections, suspended above the hearth without touching ground.

The practice emphasizes Yin-Yang coordination: Yin-water above, Yang-fire below. Fire modulation involves civil (gentle) and martial (strong) phases: martial fire dominates the beginning and end stages, civil fire the intermediate phase. The entire cycle follows the 360-degree celestial orbit principle, with proper regulation during the initial seventy and final thirty days. Yin-fire manifests as white (metal attribute), while "yellow sprouts" (nascent Yang energy) settle like lead below. These Waidan (external alchemy) terms metaphorically describe Neidan's fire regulation.

This passage explains the crucial techniques of fire regulation and cauldron (alchemical furnace) usage in Daoist alchemy. Lead and mercury (quicksilver) share a mother-child relationship, while the Azure Dragon (seven eastern constellations) and White Tiger (seven western constellations) jointly assist the practitioner. During alchemical practice, one must carefully harmonize the Divine Water (technical term referring to internal Jing-Qi) with the Golden Mother (true lead) to properly nurture the Silver Water (true mercury).

In the alchemical process, the medicinal substances (the "Charming Maiden" representing mercury and the "Infant" representing lead) mutually nourish each other within the cauldron, ultimately returning to their primordial origin. Just as proper boundaries must be maintained between ruler and minister, the firing phases must be strictly controlled throughout one complete cycle. The cultivation path is profound and mysterious—those who grasp its secrets can achieve physical transformation even with minute quantities of the elixir (measured in "knife-point" portions).

True Dao practitioners investigate the principles of the Five Phases (Wood, Fire, Earth, Metal, Water) and precisely calculate medicinal proportions. These mysteries should be deeply guarded and not lightly transmitted. Upon successful cultivation, one may ride white cranes and dragon-scales to roam the celestial realms of Great Void.

Regarding cauldron dimensions, ancient standards used the middle section of the left middle finger (approximately one inch) as measurement. However, the author considers this symbolic method somewhat unreasonable, leaving room for improvement by advanced practitioners. The essential focus lies in fire regulation: during the first three days of each lunar month when Yang energy is weak, breathing cycles (respiratory counts) gradually increase from 40 to 60 counts; from the fourth day onward, daily increments of 10 breaths reach 180 counts by the fifteenth day; after the sixteenth day, daily decreases return to 40 counts by month's end. This respiratory rhythm mirrors lunar phases, embodying the natural waxing and waning of Yin-Yang energies.

This passage explains the temporal calculations and Yin-Yang transformation principles in Daoist Neidan (internal alchemy) practice. First, it discusses the rhythm of breathing during cultivation: eighty breaths form one cycle, accumulating to 260 by month's end. Adding seventy breaths aligned with three ten-day periods completes the full 360-day celestial cycle, a theory proposed by Wei Boyang (Master Wei).

Regarding Yin-Yang movement: Yang energy begins its ascent at the Zi hour (11 PM-1 AM), peaking at the Si hour (9-11 AM); Yin energy arises at the Wu hour (11 AM-1 PM), concluding at the Hai hour (9-11 PM). The transition between Si and Wu hours (around 11 AM) marks a crucial Yin-Yang pivot, while the Zi-Hai transition (around 11 PM) represents another critical juncture. The "Li Palace" refers to the heart region, "yellow lead teeth" signify kidney Jing (essence), and "Kan center fluid" denotes kidney water.

The text then deciphers the "two sevens" concept: The Yellow Court Scripture (Huangting Jing) specifically mentions seven-day cycles, actually comprising two seven-and-a-half day periods—from the eighth night to the fifteenth forms the first, and from the sixteenth to noon on the twenty-third the second. Practitioners must focus on "nourishing the mud pellet" (Baihui acupoint at the crown) and "ascending the mysterious" through the northern "river chariot" (Governor Vessel). Here "the child" refers to the cultivator, and "not leaving the gate" means all practice occurs internally.

When the upper, middle, and lower Dantian (energy centers) gradually fill with Jing, it's called "achieving fire"; when essence returns to its source forming the Golden Elixir (Jindan). Completing one full cycle—equivalent to a year—requires passing through three critical "altar fire phases" (crucial stages of alchemical firing). The entire process demands vigilant protection against essence leakage, requiring nine such grand cycles for full accomplishment—a truly prolonged path.

The latter part employs Zhouyi (Book of Changes) hexagrams to explain cosmic operations: Qian-Kun (Heaven-Earth) as foundation, Kan-Li (Water-Fire) as pivotal mechanism. Beginning with Zhen-Xun (Thunder-Wind) and concluding with Gen-Dui (Mountain-Lake), Qian-Kun encompass all trigrams. Three lines form a trigram symbolizing Heaven-Earth-Humanity triad; doubled trigrams make six lines corresponding to six qi. The fifth line position holds supreme importance, representing complete Five Phases (Wuxing). Through five-six correlations, one comprehends Yin-Yang's cyclical patterns.

The Zhouyi's upper canon begins with Qian-Kun and ends with Kan-Li; the lower canon starts with Xian-Heng and concludes with Jiji-Weiji, arranged according to the nine palaces with corresponding hexagram sequences. Qian and Kun's line patterns generate all sixty-four hexagrams' imagery, while Kan-Li represent balanced Yin-Yang qi. Zhen, Gen, Xun, and Dui obtain partial qi, their arrangements all inversely paired. These manifestations reveal the principles of Yin-Yang cycles, odd-even pairings, void-solid mutual generation, and hard-soft interactions—whether in celestial seasons or human qi-blood circulation, all express this unified cosmic pattern.

All things manifest forms after coming into being. Once forms appear, they multiply and grow continuously until reaching a certain scale where quantitative patterns emerge. The human body contains fifty key components: eight cranial bones, nine orifices, five viscera (zang organs), six bowels (fu organs), fingers and toes, plus two kidneys - totaling fifty locations. The "heart" is excluded from this count because it occupies the special position of Taiji (Supreme Ultimate, the cosmic origin).

The method of divination using yarrow stalks (ancient divination tools): dividing the stalks into two piles symbolizes heaven and earth, while setting aside one stalk represents humanity - this constitutes the "Three Powers" (San Cai). Counting them in groups of four symbolizes the four seasons, and placing the remainders between fingers represents intercalary months. This process performed twice completes one hexagram. The heavenly numbers (yang) are five, representing intangible, dynamic aspects like human consciousness, breath (Qi), will, wisdom, and enlightenment. The earthly numbers (yin) are also five, representing tangible existence such as limbs and the physical body.

Specifically: the heavenly number twenty-five corresponds to nine orifices, five viscera, six bowels, and five sense organs; the earthly number thirty corresponds to fingers and toes, twenty-eight bones, and two kidneys - totaling fifty-five. These numbers constitute the operational patterns of the human body, where gathered Qi forms essence (Jing), and breathing establishes the cyclical movement of Yin-Yang. Human intelligence or dullness originates from innate nature, while good and evil arise from a single thought - this is the Dao of Yin-Yang transformation.

The 216 counting rods of the Qian hexagram (yang) correspond to the total number of tendons and meridians, while the 144 rods of the Kun hexagram (yin) match the count of teeth and joints - combined as 360, symbolizing the correspondence between human structure and the days of a year. Confucius noted the actual year contains 365¼ days; the use of 360 here symbolically removes six days, akin to omitting five and one from the Dayan number (divinatory calculation). Han dynasty scholars matched 360 days to 384 yao (hexagram lines), with the extra 24 lines lacking corresponding days leading to the "six days and seven parts" theory. They further excluded the four cardinal hexagrams (Kan, Li, Zhen, Dui) to correspond with the twenty-four solar terms - though these interpretations remain debatable.

This scripture primarily discusses the relationship between the numerical principles of the Zhouyi (Book of Changes) and the operations of heaven-earth as well as human cultivation. The core idea states: The 360 days of a year correspond to the twelve lines (yao, the fundamental components of hexagrams) of the Qian (Heaven) and Kun (Earth) hexagrams. Although the lunar calendar accumulates an extra six days annually to form intercalary months, this twelve-day discrepancy precisely aligns with the transformational patterns of the twelve yao. This celestial rhythm perpetually circulates through the six directions of emptiness (liuxu, referring to the six spatial dimensions of up-down and four cardinal directions).

While the "Great Expansion" number (Dayan zhi shu, the fifty yarrow stalks used in ancient divination) is said to be fifty, only forty-nine are actually used—with one reserved to symbolize the "Supreme Ultimate" (Taiji). This mirrors how the five senses expend vital essence (Jing) during activity, requiring inner stillness to maintain equilibrium. If one can harmonize the microcosm of the human body with the macrocosm of heaven-earth, the state of "cosmic oneness" (tianren heyi) can be realized. Whether for self-cultivation, divination, or governance, all will then accord with the Dao's natural patterns.

The text notes that the two portions of the Zhouyi contain 11,520 possible stalk combinations (ce, representing divinatory outcomes), corresponding to all pores and hairs in the human body while symbolizing the myriad phenomena of existence. The twelve months of a year comprise 4,320 double-hours (ancient China divided days into twelve shichen periods), a number likewise interconnected with the Zhouyi's numerical system.

Finally, it quotes Master Zihua (a Daoist figure): "The formation of heaven-earth results from the intercourse of Yin and Yang Qi, termed 'central harmony' (zhonghe)." Through transformations of "three-threes and six-sixes" (referring to the Yijing principles of three-line trigrams and six-line hexagrams) combined with the four symbolic progressions (siying: lesser Yang, greater Yang, lesser Yin, greater Yin), the sixty-four hexagrams ultimately emerge. These numerical laws can simultaneously navigate worldly changes and comprehend divine mysteries, rooted fundamentally in the Yin-Yang principle of "heaven-one earth-two" (the Hetu numerology where odd numbers belong to Yang and even numbers to Yin).

This passage discusses the numerical correspondences between heaven and earth, yin and yang in the Zhouyi (Book of Changes), and the interconnectedness between the human body and the cosmos. The sequence "five of heaven, six of earth; seven of heaven, eight of earth; nine of heaven, ten of earth" represents an ancient symbolic system where numbers signify the transformations of yin-yang between heaven and earth.

The Daoist recluse Master Mayi understood its profound mysteries: "Heaven's one generates water," where the Qi of the Kan trigram (symbolizing water) is nurtured within Qian metal (symbolizing heaven). These trigrams must harmonize to take form—just as heaven's one combines with earth's six to produce water, or Qian merges with Kan to create water within metal. Though the cycles of mutual generation and restraint among the Five Phases (Wood, Fire, Earth, Metal, Water) seem simple enough for children to recite, the subtle mechanisms of their transformations remain elusive even to adults.

Confucius once said: "Those who comprehend the Dao of transformation understand the workings of the divine." Though the Yijing appears static, it resonates with all phenomena to illuminate cosmic principles. Sages used it to purify their hearts, storing wisdom within to share fortune and misfortune with the people. Through spiritual insight they foresaw the future; through wisdom they preserved the past. The ancients—brilliant, sagely, divinely martial yet nonviolent—all practiced thus.

Heaven and earth embody the supreme archetype; the four seasons reveal the most evident transformations; the sun and moon manifest the brightest radiance; wealth and honor represent the loftiest aspirations—all are derived from these patterns. Consider also the numerical principle of "three for heaven, two for earth": human finger joints display "two for earth, three for heaven," while toe joints show "three for heaven, two for earth." With five digits on each hand and foot, we see the manifestation of the number five.

The Qian hexagram states: "The great person shares virtue (De) with heaven and earth, radiance with the sun and moon, rhythm with the four seasons, and discernment of fortune with the spirits." Acting ahead of celestial timing, heaven does not oppose; acting afterward, one follows heaven's course. If even heaven offers no resistance, how much less would humans or spirits? In the Dayou hexagram, only the fifth line is yin, symbolizing humble receptivity, while the top yang line declares "Heaven protects—auspicious without adversity," demonstrating the inherent unity of heaven and humanity.

From the Qian and Kun hexagrams to Kan and Li, then to Zhen, Gen, Xun, and Dui, the Yijing completes its symbolism of all phenomena. From heaven-earth to yin-yang, then to essence (Jing) and vital energy (Qi), human nature takes form and the body is established. Thus we see how the eight trigrams and nine chapters correspond to the body's eight skeletal structures and nine orifices, while the operations of the Five Phases and six climatic energies follow these same transformative principles.

The five yin organs (liver, heart, spleen, lungs, kidneys) and six yang organs (gallbladder, stomach, large intestine, small intestine, bladder, and triple burner) in our human body are as complete and perfectly arranged as the hexagram lines in the Book of Changes (Yijing). All the intrinsic energies - Shen (spirit), Hun (ethereal soul), Po (corporeal soul), and the other vital forces - are fully present within us. The Qi (vital energy) circulates continuously, while the Yin-Yang energies engage in their opening and closing movements. The grand cosmic principles revealed in the Zhouyi (Book of Changes) are in fact manifested within our physical form - this microcosm of the universe.

(Note: Here "the great Dao of the Changes" refers to the cosmic laws revealed in the Zhouyi. "Opening and closing" describes the alternating movements of Yin-Yang energies, a crucial concept in Daoist Neidan (internal alchemy) practice that sees the human body as operating according to the same principles governing the cosmos.)