《抱一函三祕訣》

Secret Teachings on Embracing the One to Encompass the Three, Volume 6

(Compiled by Quanzhen lineage master Jin Yueyan, transmitted by Quanzhen Daoist Huang Gongwang, the "Great Enthusiast")

This scripture primarily elucidates the formation of innate primordial Qi (Yuanqi) in the human body and the principles of its cultivation:

1. Cosmic Operations

• Illustrated through the Bagua (Eight Trigrams) directions: From Qian (Heaven) to Zhen (Thunder), rotation moves leftward; from Kun (Earth) to Xun (Wind), rotation moves rightward, forming the innate coiled configuration.
• Heaven and Earth establish their positions; mountains and marshes share breath; thunder and wind stir each other; water and fire coexist without conflict.
• Qian (Heaven) and Kun (Earth) fix the upper and lower poles like a great crucible, while Kan (Water) and Li (Fire) reside at the center as the pivot of transformation.

2. Nature of Innate Primordial Qi

• The Yang energy of the Qian trigram is called "Xing" (innate nature), also termed "Yang Jing" (Solar Crystalline) or "Heavenly Hun" (Celestial Soul).
• Analogized to silver ore, its essence is a single Qi encompassing three origins (i.e., the original Shen, or spirit).
• After conception, it lodges in the Kun Palace (between the kidneys), lying dormant during the Hai hour (9–11 PM), sprouting in the Ren hour (11 PM–1 AM), growing in the Zi hour (1–3 AM), and flourishing in the Gui hour (3–5 AM).
• This mass of Qi ultimately returns to the middle Dantian (energy center) to become the "Elixir Mother" (the foundation of alchemical practice).

3. Human Conception Process

• When parental Jing (essence) and blood unite, innate Qi resonates and emerges (called "Xing").
• It resides between the kidneys, not as a material substance directly formed by parental Jing and blood.
• This formless Qi constitutes the true original face of a human.
• Before birth, it is called "Yin Metal" (Metal Mother/Metal Consort), embodying the principle of Yin-Yang mutual generation.
• After birth, it is termed "Yang Lead," akin to how lead ore in nature first absorbs cosmic Lingqi (numinous energy) to produce silver ore.

4. Principles of Cultivation

• Before the human body takes form, it already possesses the "empty Qi golden embryo" (innate primordial Qi).
• This mirrors how silver ore condenses from Lingqi into lead ore.
• When parental Jing and blood shape the physical form, innate nature takes residence within it.
• Hence, "Xing" is likened to "True Lead" (the fundamental material for cultivation).
• Lead is the mother of the Five Metals; all things depend on Lead Qi (primordial Qi) for their genesis.
• As the Dao De Jing states, "The named is the mother of the myriad things"—this very principle.
• Zhen Yizi (an adept) directly clarifies: The spiritual root of Heaven and Earth is the foundation of elixir refinement; one must comprehend the generative role of Yin-Yang's maternal aspect.

(Note: The text employs the analogy of lead-silver ore formation to describe the emergence of human Qi—a classic Neidan (internal alchemy) rhetorical device of "using Waidan (external alchemy) to metaphorize Neidan.")

This scripture elucidates the core concept of Neidan (internal alchemy) practice in Daoism—the "Danji" (foundation of elixir refinement). Danji refers to the primordial essence generated when Heaven and Earth first intermingled, also called "flowing crystal" or "earthly soul." Within the Five Phases (Wood, Fire, Earth, Metal, Water), it belongs to Water, corresponding to the principle of "Heaven's first birth of Water." Though watery in nature, it contains metallic properties, hence its alternative name "yang-lead" (an alchemical term denoting metal within water).

The text expounds the mutual generation of Yin-Yang: Metal (Yin) resides in the Kun position (the Earth trigram in the Bagua), ascending with yang energy. Through the dynamic interactions of the Eight Trigrams (Qian/Kun/Zhen/Kan/Gen/Xun/Li/Dui), the undulating movements of Yin and Yang emerge. Among these, the Zhen (Thunder) and Xun (Wind) trigrams serve as gateways for Yin-Yang transformation.

The latter section employs the numerical arrangement of the Hetu (River Chart) nine palaces to illustrate the correspondence between the human body and the cosmos: "Nine above, one below; three on the left, seven on the right; two and four as shoulders; six and eight as feet; with five at the center." The central "five" represents the "Central Yellow" (core of the Dantian), likened to an infant sitting upright governing all directions. The sum of numbers in every direction equals fifteen, symbolizing perfect equilibrium.

Finally, it explains the process of human conception: Before parental union, the primordial Qi (original energy) remains unified with chaos. When parental essences merge, the numinous energy attaches through resonance, forming "Shen" (spirit). This Qi gradually condenses within the womb, ultimately returning to the central palace (Dantian) to become the pivotal axis of alchemy—where the convergence of lead and mercury (alchemical terms representing Yin-Yang energies) accomplishes the sacred body.

Plain Language Interpretation of the "Clarifying the Spirit Chamber" Chapter from The Secret of Embracing Oneness and Containing Three:

The Spirit Chamber (神室) is the pivotal element in Neidan (内丹, internal alchemy) practice. The Dragon-Tiger Scripture states that the Spirit Chamber serves as the central axis for elixir refinement. Within the human body, where the five organs and six viscera are densely packed, only the Spirit Chamber remains empty. It resembles an empty room that can accommodate people, or a hollow vessel that can hold objects. This is why the Daode Jing (道德经) states: "We shape clay into a vessel, yet it is the emptiness within that makes it useful; we carve doors and windows to make a room, yet it is the empty space that creates its utility."

All things between heaven and earth possess their own Spirit Chambers: the cosmos takes emptiness as its Spirit Chamber, while all creatures take the womb as theirs. Consider human rebirth—without this spiritual vessel, how could reincarnation occur? Aging and death ultimately stem from the spirit having no abode. Therefore, recognizing this Spirit Chamber is the most crucial aspect of Neidan cultivation.

Within the body, the marrow sea (brain) corresponds to heaven, while the essence chamber (lower Dantian, 丹田) corresponds to earth, with the yin and yang energies (阴阳) ascending and descending between them. The Spirit Chamber resides at the central point between these celestial and terrestrial poles—bounded above by the Yellow Court (middle Dantian) and below by the Gate of Origin (lower Dantian), classically termed the "upper and lower crucibles." When refining the Golden Elixir (金丹), practitioners must first contemplate their original nature (called "lead") within this chamber. This contemplation should follow the principle of "first preserving then forgetting"—only through this dynamic balance can true stillness be achieved.

Some practitioners forcibly shut out external distractions by fixating on a single thought. While this may appear focused, it ultimately remains a form of attachment. Others completely sever external connections and empty all thoughts—though seemingly tranquil, this constitutes a yin-biased, lifeless form of meditation. Neither approach represents the supreme path.

The Daode Jing teaches: "Constantly without desire, observe its mysteries; constantly with desire, observe its manifestations." Buddhist scriptures similarly state: "Those who can transform phenomena are no different from Tathāgata (如来)." This reveals the true marvelous function of the Spirit Chamber. Some may question: "Tathāgata belongs to Buddhism—how does it relate to the Spirit Chamber?" The answer lies in recognizing that enlightened beings like Śākyamuni, Bodhidharma, and Puhua ultimately realized the same supreme state as the Golden Fluid Returning Elixir (金液还丹).

The Secret Formula of Embracing Oneness to Contain the Three discusses the crucial importance of timing (water-clock measurements) in Daoist Neidan (internal alchemy) practice.

The text explains that cultivators must attune themselves to the temporal rhythms of heaven and earth (marked by the water-clock), maintaining mental stillness and balanced Qi (vital energy). If one's Shen (spirit) becomes dull or Qi grows restless, the optimal cultivation periods will be missed. Each day divides into twelve two-hour periods (corresponding to the twelve Earthly Branches), which align with the twenty-four solar terms to form a complete annual cycle. Particular emphasis is placed on the hours of Jia and Geng (roughly dawn and dusk)—periods when the celestial Qi is most vibrant, akin to the moon's waxing and waning or the equinoxes dividing the year.

Practitioners gauge these periods through breath: during Zi (23:00–1:00), Qi flows left; during Chou (1:00–3:00), it flows right, and so forth. Special attention must be paid to transitional moments—like those between Hai and Zi, Yin and Mao, Si and Wu, or Shen and You—when Yin and Yang energies intermingle. These are pivotal junctures for "gathering the medicinal herbs" (harvesting celestial and earthly Qi).

The text employs symbolic imagery to underscore timing's significance:

• Zi and Wu hours are the "gates" for Qi's advance and retreat.
• Mao and You hours are the "windows" for Qi's entry and exit.
• Yin and Shen hours are the "omens" for Qi's rise and fall.

These six periods (Zi, Wu, Mao, You, Yin, Shen) correspond to six critical stages in elixir refinement.

The practice method involves sitting in stillness at the end of the Yin hour (3:00–5:00), concentrating the Shen in the Dantian (energy center, or "spirit chamber"). Here, the "lead within the cauldron" (an alchemical term denoting primordial Qi) represents water's nature—the source of life. This primordial Qi ascends from the kidneys, passing through key points like the Dantian and Huangting (Yellow Court), embodying the primal energy present since creation. During the Shen hour (15:00–17:00), practitioners must perceive this energy's movement through breath.

(Note: "Linji" refers to the Linji school of Chan Buddhism, used here as a metaphor for alchemical cultivation; "lead and mercury" are Neidan terms symbolizing Jing (essence), Qi, and Shen; "Huangting" denotes the middle Dantian region.)

This passage explains the specific methods and principles of "herb gathering" (collecting the body's essential Qi) in Daoist Neidan (internal alchemy) practice:

During cultivation, one must pay attention to the coordination of breath and intention. When Qi enters from the "Celestial Kitchen" (upper Dantian) and the "Breath Gate" (respiratory passageways), Shen (spirit) and Qi merge within the body. If both the upper and lower gates (the seven upper orifices and two lower orifices) remain closed, true Qi will circulate and steam within the body, gradually allowing one to perceive the "Celestial Signs" (indications of Qi movement).

Timing is crucial:

• During Mao hour (5-7 AM), herb gathering should cease, as Qi collected after this period no longer carries the innate prenatal energy
• At Wu hour (11 AM-1 PM), Yin Qi arises from the "Marrow Sea" (spinal cord) and descends to "Yang Pass" and "Twin Passes" (key bodily junctures)
• Shen hour (3-5 PM) marks the latency of Yang Qi—one should sit in meditation near its end (around 4:45 PM) to prepare
• Geng hour (around 5 PM) is the proper time for herb gathering, using methods similar to the preservation techniques of Yin hour

When Qi flows smoothly, employ the "Warm Water Method" (a guiding technique) to direct Qi movement while sealing the lower two orifices. At this point, Jing-Qi will cross the "Magpie Bridge" (the channel formed by the tongue touching the palate) to enter the "Divine Chamber" (heart cavity), uniting with the original spirit—this is the essence produced by the "Dragon-Tiger Union" (the coupling of Yin-Yang energies). The process should conclude by You hour (5-7 PM).

The scripture emphasizes three essential points:

1. Upper orifices remain unbreached (sensory faculties not dispersing outward)

2. Lower orifices remain unleaked (essential Qi not dissipating)

3. The center remains unmoved (mental stillness maintained)

Achieving these brings forth "Celestial Signs": first bodily comfort, then unobstructed Qi channels, and finally the experience of "illumination born from empty chambers" (light emerging from profound stillness). Remain composed, allowing spirit and Qi to return naturally to their source.

The entire process is called "pursuing the two Qi along the Yellow Path, uniting the three natures in the Primordial Palace" (guiding Yin-Yang energies along the Governing and Conception vessels to converge Jing-Qi-Shen in the Dantian). Just as farming requires proper timing, cultivation must strictly follow these hourly rhythms—missing them would be like failing to sow seeds in season.

The passage concludes by noting human life arises from the union of parental essence-blood (physical life) and innate nature (spiritual essence). Cultivation seeks to return to this primordial state of unified nature and life.

Note: Terms like "Warm Water Method," "Magpie Bridge," and "Dragon-Tiger Union" are specialized Neidan terminology referring to specific cultivation techniques and bodily sensations.

This scripture elucidates the core principles of Daoist Neidan (internal alchemy) practice, focusing on the interrelationship and cultivation methods of the "Three Treasures": Jing (essence), Qi (vital energy), and Shen (spirit).

Within the human body, the foundational substance sustaining both consciousness (Shen) and physical form is called "primordial Qi" (innate energy). When Qi condenses, it forms "Jing" (vital essence). These three—Jing, Qi, and Shen—collectively constitute human wholeness. Ordinary practitioners who cultivate properly can stabilize their Shen; stabilized Shen leads to consolidated Qi, and consolidated Qi ensures abundant Jing. When all three remain robust, the body maintains integrity. The decline of any single element causes mutual detriment among all three.

The scripture cites poetic verses: "Jing nourishes the root of spiritual nature, Qi nourishes the primordial spirit—this constitutes the truest path of cultivation." Immortals often refrain from explicit explanations, as revealing these secrets prematurely may harm practitioners.

Practical cultivation methods:

1. First, visualize the primordial spirit (one's authentic consciousness) within the body, termed "Wu Earth" (yang earth), representing innate nature and the transformation of true lead (primordial Jing).

2. Then guide the vital Qi into the body, called "Ji Earth" (also known as the Yellow Matron, the mediator harmonizing yin-yang), representing emotional consciousness and the transformation of cinnabar-mercury (yin-yang energies).

3. When yin and yang energies interact, they generate emotional activity. Primordial Qi resides in the Dantian (the Kun palace), from which it emerges, allowing the golden embryo (nascent Golden Elixir) to form and ascend.

The text emphasizes the critical role of "gold-fire" dynamics:

• Gold symbolizes the golden embryo (Golden Elixir)
• Fire represents the generation of yang energy

These two elements form the most essential components of alchemical practice. When these energies circulate and return to the central palace (Dantian), they produce "cinnabar" (yang energy). As the energy ascends to the crown (marrow sea), it generates yin energy through the process called "extracting mercury from cinnabar" (deriving yin from yang).

Timing is crucial in practice:

• During Jia hours (yang-dominant periods), ascending Qi becomes "cinnabar" (half-catty of gold)
• During Geng hours (yin-dominant periods), descending Qi becomes "mercury" (half-catty of water)

Their union achieves perfect yin-yang balance (the two-eight measure), forging the Great Elixir within. Like refining silver by combining cinnabar-mercury with lead, this process completes the Five Phases, forming the "root of unified Qi" (fundamental energy).

The scripture concludes with Master Zhang's admonition: "Without the mediating function of Wu-Ji Earth (yin-yang harmonizer) between Li (heart fire) and Kan (kidney water), even possessing the Four Symbols (young/old yin-yang) cannot produce the elixir." Only by understanding how yin and yang contain true mediating earth can the Golden Elixir return to its primordial state. Comprehending this principle equates to mastering alchemical secrets.

[Diagram of Generation]

This section explains cosmic numerology:

• Generating numbers (odd): 1 (Water), 3 (Wood), 5 (Earth), 7 (Fire), 9 (Metal)
• Completing numbers (even): 2, 4, 6, 8, 10

These numerals symbolize the generative patterns of the cosmos.

This scripture elucidates the numerical symbolism and the principles of Five Phases (Wuxing) generation and restraint in Daoist internal alchemy (Neidan) practice:

The northern Kan position (Water) corresponds to the number six, symbolizing the condensation of yin-qi into "lead"; the southern Li position (Fire) corresponds to seven, representing the return of yang-qi as "mercury"; the eastern Zhen position (Wood) corresponds to eight, signifying "cinnabar"; the western Dui position (Metal) corresponds to nine, embodying "gold"; while the central Earth position corresponds to ten as the generative core of all things, ultimately forming the "elixir" (Dan).

The cosmic numerical sum is fifty-five (heaven's numbers twenty-five plus earth's numbers thirty), from which the "Great Expansion Number" takes fifty. Subtracting the foundational Five Phases number five leaves forty-nine (symbolizing the quiescent state of Taiji). Through successive subtraction of the Five Phases base numbers (Water one, Fire two, Wood three, Metal four, Earth five), twenty-five remains as the fundamental yang number corresponding to central Earth (true Earth). Only after fivefold mathematical operations can the dynamic relationship of Golden Elixir (Jindan) cultivation be fully revealed.

Numbers and primordial qi (Qi) constitute the root of cosmic generation: the unfolding of primordial qi in "Dao generates One" manifests as numerical sequences. One through five form the foundation of material growth, while six through ten establish cyclical completion. The multiplication of heaven's numbers (odd) and earth's numbers (even) (as in heaven's one multiplied by earth's six) constructs the alchemical principle of yin-yang mutual generation. These numerical relationships correspond directly to the internal alchemical processes of lead-mercury fusion and Five Phases consolidation during elixir refinement.

This scripture expounds the principles of mutual generation and restraint among the Five Phases (Wuxing) and the alchemical process in Daoist internal alchemy (Neidan):

When the celestial and terrestrial numbers multiply (earth eight and earth four, heaven nine and heaven five, earth ten, etc.), their sum totals fifty-five. The twenty-five heavenly numbers represent growth, while the thirty earthly numbers symbolize transformation—an endless cyclical process. The Five Phases correspond as follows: heaven one is water, earth two is fire, heaven three is wood, earth four is metal, and heaven five is earth. This sequence illustrates the progression from formlessness to material manifestation.

The five essential substances in alchemy are: earth six as lead (symbolizing foundation), heaven seven as mercury, earth eight as cinnabar, heaven nine as gold, and earth ten as the perfected elixir. These materials undergo transformation from tangible forms back to formlessness, completing the cycle of "returning to the root and restoring life's mandate." Just as lead (mother of all metals) transforms into mercury, mercury condenses into cinnabar, cinnabar refines into gold, and ultimately coalesces into the elixir—this mirrors the universal process of all things returning to their original nature.

The text specifically explains: Why does it say "heaven one generates water" rather than "heaven one generates lead"? Because like the kernel hidden within a fruit, the formless spirit (Shen) precedes physical existence. Lead represents original nature, while mercury symbolizes desire. The number seven contains six (lead's essential nature), just as mercury derives from lead. The formation of cinnabar (earth two succeeding heaven seven) follows the same principle as desires arising from nature—subtracting one from eight yields seven, corresponding precisely to mercury's properties. Gold (heaven nine succeeding earth eight) refined from cinnabar embodies the fundamental law of material transformation.

Through numerical symbolism and material metamorphosis, this scripture reveals the Daoist cultivation philosophy of "returning to the origin and restoring the source," integrating the alchemical process with cosmic generative principles.

This passage elucidates the transformative principles of "lead-mercury" and "dragon-tiger" symbolism in Daoist Neidan (internal alchemy) practice, revealing the essential method of Yin-Yang interaction and returning to one's original nature through cultivation.

Numerical symbolism reveals that subtracting one from nine yields eight, and subtracting one from ten yields nine—signifying how all phenomena contain the primordial "One" (the source of Dao). Just as silver lies hidden within lead, so too does the "true spirit" (primordial Shen) dwell within human nature. Just as smelting extracts silver from lead, cultivation allows the true spirit to emerge from one's innate nature, demonstrating the principle that "Dao permeates all things."

The crux of cultivation lies in mastering the timing of Yin-Yang interaction:

1. "True lead" (primordial Jing) must be preserved in the "divine chamber" (lower Dantian) during specific temporal nodes, where breath circulation catalyzes the formation of the "elixir ingredients" (Neidan energy). Like extracting silver from lead, the true spirit manifests spontaneously through this process.

2. "Cinnabar-mercury" (postnatal vital essence), representing Yang within Yin, must be cultivated in conjunction with "golden essence" (primordial Qi). As Master Zhang Sanfeng taught, "black containing white" and "male embracing female" (the mutual containment of Yin-Yang) constitute the foundation of internal alchemy.

Practical cultivation methods include:

• During the Zi hour (11 PM-1 AM), energy rises from the "Kun palace" (abdominal region) in what's termed "Yang activating while Yin recedes"
• During the Shen hour (3-5 PM), specialized techniques guide this energy into the "divine chamber," facilitating "dragon-tiger copulation" (heart-kidney communion) to form eight ounces of "gold" (pure Yang Qi)

The passage concludes by emphasizing the essential principle: while recognizing the manifest Yang (white, male), one must preserve the hidden Yin (black, female)—this constitutes the root of the internal elixir's ingredients. Just as one cannot stoke empty cauldrons with fierce fire, there must exist the "true seed" (primordial Qi) to refine the genuine elixir.

This passage explains the interactive principles of "lead and mercury" (Neidan terminology representing the two cultivation elements of Yin and Yang) in Daoist internal alchemy practice.

When cultivating lead (representing Yang energy), the Yang force ascends. The scripture states: "When Yin and Yang merge, vital essence (Jing) and Qi envelop the primordial Qi, giving birth to all things from emptiness." Zhang Zhenren (referring to Zhang Sanfeng) explains: When the sweet dew (Neidan term for the saliva produced during cultivation) descends, the energies of heaven and earth unite, the Five Phases become complete, and Kan (water) and Li (fire) intersect. By the Si hour (9-11 am), Yang energy reaches its peak, which is what the Dragon-Tiger Scripture calls "Yang numbers are exhausted at Si."

At the extreme of Yang energy, Yin energy emerges, termed "extracting mercury from cinnabar." Mercury (representing Yin energy) is also called the "maiden" or "flowing pearl," symbolizing vibrant life force. By the Wu hour (11 am-1 pm), when Yang peaks and transforms into Yin. Mercury resides in the marrow sea (referring to important energy centers in the body). The scriptures say "true Yin emerges at Li-Wu" and "red water transforms into mercury, the maiden shakes her bell."

During the Geng hour (3-5 pm), specific methods are used to guide mercury into the cultivation space, called "mercury meeting lead's manifestation," also termed "half-catty of water" or "white gold." Here the Yin tiger (Yin energy) descends in what's called "Yin returning to Yang's chamber," where both energies meet at the mysterious pass (a crucial cultivation point).

Zhang Zhenren uses metaphors: To make true lead retain mercury is like family reunion. Wood (liver Qi) and metal (lung Qi) originally separate require the yellow grandmother (spleen earth) to mediate. Like lovers uniting to conceive life in formlessness, he describes "the maiden in blue (mercury) meeting the white-clad gentleman (lead)." These transformations occur in a state of hazy indeterminacy, ultimately forging the "perfected being" (Neidan accomplishment).

The passage emphasizes: Lead and mercury aren't simple Yin-Yang binaries. Calling lead Yang energy is acceptable, but directly equating lead-mercury with Yin-Yang is mistaken. True cultivation isn't mental play but the work of returning to origin. Zhang Zhenren states lead and mercury are fundamentally one Qi - authentic practice transcends simple Zi-Wu (Yin-Yang) distinctions.

This passage elucidates the transformative principles of Yin-Yang and the Five Phases in Daoist Neidan (internal alchemy) practice:

Lead symbolizes human innate nature, which contains the primordial Shen (original spirit), just as silver lies hidden within lead ore. Yet the silver within lead requires fiery refinement to extract—mere combination of lead and mercury (representing Yin-Yang) cannot achieve alchemical transformation spontaneously. The authentic interaction occurs between cinnabar (yang) and mercury (yin).

The scripture reveals: Cinnabar and mercury embody yang and yin respectively, both originating from the same primal Qi. When mercury encounters lead, it condenses into cinnabar, while mercury can again be extracted from cinnabar, creating a mother-child cycle of mutual generation. This demonstrates the principle of return (fanben huanyuan)—when yang reaches its zenith it generates yin, and when yin culminates it produces yang. Here, Yin-Yang corresponds to dragon-tiger, which correspond to sun-moon, which in turn relate to hun-po (ethereal and corporeal souls), then to wood-metal, then water-fire, then to the Kan (Water) and Li (Fire) trigrams, and ultimately to the conjugal union of male-female. This encapsulates the profound mechanism of cosmic creation.

Master Zhang (possibly Zhang Sanfeng) taught: One must thoroughly comprehend Yin-Yang and deeply grasp the laws of creation. The dragon metaphorically represents yang Qi ascending, while the tiger signifies yin Qi descending. The sun embodies Yin-Yang's cyclical movement—its yang contains yin essence like true mercury within cinnabar. The moon reflects the waxing and waning of human vitality—its yin contains yang essence like pure silver within lead.

The Four Symbols correspond thus:

• Azure Dragon (Qinglong) of wood corresponds to cinnabar
• White Tiger (Baihu) of metal corresponds to silver
• Vermilion Bird (Zhuque) of fire corresponds to mercury
• Dark Warrior (Xuanwu) of water corresponds to lead

Within the Five Phases, the metal mother (fundamental principle) is Wu-earth (yang earth), whose interaction with yin generates Ji-earth (yin earth). Combined with the Four Symbols, this completes the Five Phases. The dragon-tiger actually represent the pivotal transformation between wood and metal: Wood's nature seeks ascension yet struggles to rise—hence the dragon analogy; Metal's nature tends to descend yet resists falling—hence the tiger analogy. When wood is drilled, it generates fire; when twisted, it yields water. When metal is struck, it produces fire; when melted, it releases water. This water-fire dynamic manifests the interplay of Kan and Li trigrams: The yang line within Kan (Water) and yin line within Li (Fire) circulate mutually, creating the ascending-descending movement of Yin-Yang. Yang Qi rises like Kan-water flowing toward Wu-earth, while yin Qi descends like Li-fire returning to Ji-earth—this constitutes the operational principle for daily cultivation practice.

This scripture elucidates the core interrelationships between Yin-Yang, Kan-Li (Water-Fire), and Lead-Mercury in Daoist Neidan (internal alchemy) cultivation:

The principle of mutual concealment within Yin-Yang reveals that the Sun (Li trigram ☲) contains the Golden Crow (symbolizing Yang harboring Yin), while the Moon (Kan trigram ☵) holds the Toad’s Light (symbolizing Yin containing Yang). Just as sunlight governs the day (Li-Ji) and moonlight rules the night (Kan-Wu), the two Qi (energies) of Yin and Yang perpetually depend on each other, ascending and descending in cyclical harmony.

The mystery of Kan-Li inversion lies in the transformative interplay between Lead (Yang within Kan), silver, cinnabar, and Mercury (Yin within Li), termed the "reversal of Kan and Li." This mirrors natural patterns like Water-Fire mutual nourishment and Wood-Metal mutual conquest. As the Great Unity Immortal (Taiyi Zhenren) taught, cultivation requires "inverting the Five Phases"—making the Dragon (Yang) generate Mercury from Fire, while the Tiger (Yin) produces Lead from Water.

The essence of Lead and Mercury defies simplistic categorization: Lead is not pure Yin but the Yang concealed within Yin (like a father), while Mercury is not pure Yang but the Yin latent within Yang (like a mother). Lead corresponds to the prenatal Primordial Qi (formless yet eternal), whereas Mercury represents postnatal Jing (essence). The primordial state of Lead, called "Golden Mother" (Jinmu), serves as the foundation of alchemical practice.

The crux of cultivation lies in recognizing that the true Golden Elixir (Jinye Huandan) cannot be achieved by simplistically equating Lead-Mercury with Yin-Yang. Practitioners must comprehend that extracting Mercury from cinnabar symbolizes Yang generating Yin, while transforming kidney Jing into Qi exemplifies Yin generating Yang. Those who merely treat cinnabar and Mercury as literal Yin-Yang engage only in superficial mental techniques, never attaining genuine alchemical realization.

(Note: Terms like "Lead-Mercury," "Dragon-Tiger," and "Hun-Po" are Neidan metaphors representing distinct energy states and cultivation stages within the human body.)

This scripture elucidates the principles of mutual generation and restraint between Yin-Yang and the Five Phases in Daoist Neidan (internal alchemy) practice. The core concepts are:

1. Mutual transformation of Yin-Yang: Mercury (representing Yang) and gold (representing Yin) share a conjugal relationship capable of mutual transformation. Similarly, lead (Yang) and silver (Yin) demonstrate this intergenerational dynamic—the phenomenon of silver emerging from lead resembles a son giving birth to his mother, defying conventional logic.

2. Inversion of the Five Phases: While the standard sequence shows metal generating water, cultivation requires "reversing the Five Phases' natural flow," making the tiger (metal) emerge from water. Normally wood generates fire, but through "Five Phases inversion," the dragon (wood) must arise from fire. These represent the unique laws of internal alchemy practice.

3. Union of Kan and Li: Kan (water) represents kidney Jing (essence), while Li (fire) symbolizes heart Shen (spirit). Practitioners must facilitate the interaction between Kan's Yang energy (Wu earth) and Li's Yin energy (Ji earth), akin to the sun and moon merging—this constitutes the crucial process of elixir formation.

4. Cultivation process: First gather the primordial Qi (true lead) and refine it into cinnabar within the Dantian (divine chamber). When this cinnabar reaches the heart region (Li palace), it transforms into mercury. The mercury then returns to the Dantian to become silver, completing one cycle—known as "returning to the root and restoring life."

5. Terminology correspondences:

• Lead = Golden Duke = Wu earth (primordial Qi)
• Mercury = Charming Maiden = Ding fire (heart Shen)
• Yellow Matron = Ji earth (true intention, mediating function)
• Infant = Yang spirit (culmination of practice)

Master Zhang's verse explains: extract the Yang energy from the kidneys (the solid within Kan) to transform the Yin essence in the heart (the empty within Li), thereby refining the pure Yang body (Qian's vigorous form) to attain spiritual liberation.

The Wuji diagram commentary emphasizes: at proper intervals, store Shen in the Dantian—first gather primordial Qi to form cinnabar, circulate it to the heart to become mercury, then return it to the Dantian as silver, repeating this cycle. This "embracing Yang while carrying Yin" method conceals true Yang within the Yin chamber (Dantian), forming the foundation of elixir formation.

This passage expounds the transformative principles and essential practices of "lead and mercury" (symbolizing the yin and yang energies within the human body) in Daoist Neidan (internal alchemy) cultivation:

Lead and silver (representing yin and yang energies) are crucial materials in alchemical practice. Silver symbolizes the essence of metal (golden crystal), while lead embodies the watery virtue of the north (northern numen). Though water belongs to yin in the Five Phases system, it contains the primordial Qi (pivot of the Dao), enabling the generation of silver-lead that ultimately refines into the Golden Elixir. Externally black yet internally storing silver essence, lead resembles a person wearing coarse cloth while concealing precious jade. Silver is lead's "child" hidden within, while lead serves as silver's "mother," like a womb enveloping its fetus. When heated in the alchemical furnace, lead descends while silver ascends, revealing its pure white form that can be transmuted into gold.

The core alchemical principle operates thus: silver emerges from lead; mercury (quicksilver) coagulates through lead to form cinnabar; mercury extracted from cinnabar can revert to silver. When silver fully manifests, lead completes its transformation—this constitutes the "returned elixir" (Golden Elixir) process, fundamentally returning primordial Qi to its source. Ancient alchemical scriptures state "seemingly using lead yet not using lead," indicating the extraction of lead's essence (withdrawing lead to replenish mercury). "Withdrawing lead" refines away yin energy, while "replenishing mercury" transforms yin into yang energy. When yin mercury fully converts to pure yang, the Golden Elixir is achieved.

Key cultivation requirements include: 1) Comprehending yin-yang's waxing-waning rhythms; 2) Practicing with undivided attention, never squandering time; 3) Stabilizing the Shen (spirit) without scattered thoughts; 4) Maintaining softness and stillness (embracing the feminine and holding the One) to concentrate primordial Qi; 5) Only commencing formal alchemy when the medicinal ingredients (Jing-Qi-Shen) are fully prepared. Practitioners must guard against fame and wealth's distractions—mental agitation dissipates vital energies, nullifying previous efforts.

The passage concludes by revealing the essence of "golden fluid returned elixir": The primordial Qi (empty Qi golden embryo) is the yang spirit—the indestructible original face transcending kalpas (yang aspect); while true nature (yin aspect) resembles silver concealed within lead, with authentic spirit latent in fundamental nature. These mutually generative forces dwell between the kidneys, forming the root of human life.

(Note: The lead, mercury, and silver discussed serve both as literal alchemical substances and metaphors for yin-yang energy transformations within the body.)

This scripture elucidates the principles of fire modulation (huohou) and the transformation of Jing (essence), Qi (vital energy), and Shen (spirit) in Daoist Neidan (internal alchemy) practice. The text unfolds in several interconnected sections:

The first section describes the generation of the "medicinal foundation of the elixir" (yao zu dan ji), the fundamental basis of internal alchemy. During the Zi hour (11 PM-1 AM), the emerging Yang energy is called "Yang fire" - the root energy of cultivation. This energy naturally ascends like goods carried on a cart. If consciously guided through intention into the central palace (zhonggong, the Dantian), it grows stronger daily; if neglected, it dissipates through mundane expenditures.

A poetic verse in the second section emphasizes key cultivation principles: the heart-mind must remain pure as "a spotless ice vessel" (ling tai jiao jie si bing hu), inhabited solely by the primordial Shen (spirit). Any adulteration with distracting thoughts obstructs the attainment of serene emptiness. Practitioners must focus on the "chamber of spirit" (shen shi) - that square-inch space of the Dantian.

The third section details breathing techniques: cultivation requires breathing from the root (hu zhi yu gen) and inhaling from the stem (xi zhi yu di), connecting upper and lower energies. This transcends ordinary respiration, aiming for the state of "suspended breathing" (jue hu xi, embryonic respiration). At advanced stages, two vital energies (dragon and tiger) spontaneously unite.

The fourth section thoroughly explains fire modulation: ignition should commence at the winter solstice's Zi hour (yang energy's initial emergence), adjusted according to the twelve double-hours and twenty-four solar terms. The text employs hexagram transformations to illustrate Yang energy's growth: from Fu (one Yang line) through Lin and Tai (three Yang lines opening prosperity) to Dazhuang (four Yang) and Guai (five Yang). Special mention is made of "bathing periods" (mu yu) during Mao (5-7 AM) and You (5-7 PM) hours when fire application pauses, allowing the Golden Elixir (jindan) to incubate naturally.

(Note: Technical terms include "dragon-tiger copulation" (long hu jiao gou) for yin-yang energy fusion, "golden sand" (jin sha) as metaphor for the elixir, and "eldest son inheriting the father's form" (zhang zi ji fu ti) symbolizing yang energy continuity - all specialized Neidan terminology.)

This passage explains the application of "fire timing" (huohou) in Daoist Neidan (internal alchemy) practice and the principles of Yin-Yang transformation, using the hexagrams of the Yijing (Book of Changes) as metaphors for the alchemical process:

Beginning at the Si hour (9-11 AM), when Yang energy reaches its peak (represented by the pure Qian hexagram), it resembles an eldest son inheriting his father's legacy. The practitioner should start stoking the Yang fire (activating internal Yang energy) from the Chen hour (7-9 AM). By late Si hour, the mutual stimulation of metal (Jin) and fire (Huo) ascends to the "marrow sea" (the crown of the head), and when Yang energy culminates, preparation for transition begins.

At the Wu hour (11 AM-1 PM), the Qian hexagram generates one Yin line below, transforming into the Xun hexagram (Heaven-Wind Gou). During the Wei hour (1-3 PM), a second Yin line forms the Gen hexagram (Heaven-Mountain Dun). By the Shen hour (3-5 PM), three Yin lines create the Pi hexagram (Obstruction), as Yang energy gradually withdraws and the "true mercury" (a Neidan term for the refined essence of Jing and Qi) begins to take shape. The practice口诀 (oral formula) instructs practitioners to cease stoking the fire at this stage, allowing the golden elixir to circulate naturally.

During the You hour (5-7 PM), four Yin lines form the Guan hexagram (Observation). At the Xu hour (7-9 PM), five Yin lines create the Bo hexagram (Peeling Away), and by the Hai hour (9-11 PM), six Yin lines complete the pure Kun hexagram, marking the full Yin-Yang cycle. Here, practitioners must begin circulating the "talisman" (activating Yin energy) from the Xu hour, so that by late Hai hour, Yang energy re-emerges (as seen in the Fu hexagram of Return). This cyclical process mirrors the ten-month gestation of human pregnancy.

The entire process demands precise regulation of fire timing. The slightest deviation may cause the "crimson dragon" (Yang energy) to run wild or the "white mercury" (Yin essence) to scatter, preventing the formation of the golden elixir. The key lies in allowing the dual forces of Yin and Yang to flow as naturally as heaven and earth breathe, with Yang fire and Yin talisman alternating in orderly succession. Only through this can the golden elixir be perfected, ultimately enabling the practitioner to undergo spiritual transformation and attain immortality.

The Secret of Embracing Unity and Containing the Three reveals the crucial points of "fire timing" (the regulation of breath and mental focus during cultivation) in Neidan (internal alchemy) practice.

Master Zhang (a renowned Daoist adept) states: Even if one comprehends the principles of cinnabar (symbolizing the original spirit, shen) and black lead (symbolizing the original essence, jing), without understanding the precise control of fire timing, all efforts are in vain. The refinement of the elixir depends entirely on meticulous regulation—the slightest deviation will result in failure, so utmost caution is required.

"Fire timing" refers to:

• The concentrated focus of the mind (shen)
• Breath so steady it nearly ceases
• The convergence of qi from the six meridians (the body's energy channels) into the Dantian (energy center)
• The fullness of jing and qi in the Three Dantian (upper, middle, and lower cultivation centers)

Its manifestations include:

1. The upper Dantian (in the head) and lower Dantian (in the abdomen) forming an energetic circuit.

2. The body becoming as still as the sun and moon, with qi circulating naturally.

3. Maintaining this state day and night, free from distractions.

Only then can one attain the realm of true Yang and begin to crystallize the internal elixir. If the protective measures are lax, allowing jing and qi to leak, the elixir will not form. These are the secret teachings.

Practical Method (Using the Winter Solstice as an Example):

1. Preparation (30 days before the solstice):

• First 15 days: Stabilize the "spiritual root" (innate jing and qi).
• Next 15 days: Focus on visualizing the qi between the two kidneys.

2. Formal "Igniting the Fire" (at midnight on the solstice, 11 PM–1 AM):

• The mind follows the rising Yang qi from the kidneys, creating the "fusion of metal and fire" (jing and shen merging).
• The connection between the root (lower Dantian) and the flower stem (upper Dantian) must remain unbroken.
• Breath coordination:
• Inhale: Focus descends to the lower Dantian.
• Exhale: Focus ascends to the upper Dantian.

Detailed Fire Timing:

• Zi Hour (11 PM–1 AM): Begin "igniting the fire" (guided by specific oral instructions), maintaining deep, even breath for three hours (until Yin hour, 3–5 AM).
• Mao Hour (5–7 AM): Pause ("bathing," allowing the Golden Elixir to gently refine itself).
• Chen Hour (7–9 AM): Resume "igniting the fire."
• Si Hour (9–11 AM): After Yang qi peaks, shift to "Yin talisman" (gathering and nourishing).
• Wu Hour (11 AM–1 PM): Begin the "warm water" phase (guided by another formula) for three hours.
• You Hour (5–7 PM): Another "bathing" period.
• Xu Hour (7–9 PM): Continue circulating the talisman.
• Hai Hour (9–11 PM): Complete the cycle, returning to the origin, awaiting the next surge of Yang qi.

The entire process demands precise timing, breath rhythm, and mental guidance. Only through such celestial cycles can the Golden Elixir be perfected.

This passage elucidates the concrete methods and precautions for Daoist Neidan (internal alchemy) practice:

Regarding the Golden Elixir refinement:

Take one millet-sized elixir daily. Over one year (360 days) comprising 4,320 two-hour periods, exclude the mao (5-7am) and you (5-7pm) periods for "metal-water bathing" (a special meditative state), abstaining from yang-fire and yin-talisman cultivation. The actual practice period spans 300 days (10 months) for refining the golden-liquid returning elixir, ultimately achieving the transcendent state of spiritual transformation.

Concerning the Sacred Embryo's emergence:

After forming the Sacred Embryo (cultivated spirit), continue practicing 100 or 60 days in stillness before emergence. Premature emergence risks encountering "rigid winds" (external disturbances) causing cranial hardening. The correct method: visualize the embryo in the marrow sea (brain), then suddenly—like hearing thunder—the Celestial Gate (crown) opens naturally for smooth emergence. Post-emergence, practice gradual movement until attaining abilities to penetrate matter and traverse the Three Realms.

Meditation technique:

Sit upright with lowered eyelids (half-closed eyes), sealed lips, concentrated spirit, and even breathing. Through mutual steaming of ascending-descending Qi, accumulate mouth nectar to swallow and guide to the Dantian (energy center). Repeat until fatigued.

Key points:

• Practice on prepared seats with closed windows by day; may rest with open eyes behind curtains at night
• The body has nine orifices (six upper Kun trigram orifices, three lower Qian trigram orifices)
• When passages remain blocked, return to fundamentals—operate like bellows to unlock mysteries
• As immortals say: "All 84,000 mechanisms open with one key" (symbolizing essential practice principles)