《周易參同契分章通真義》Vol. 2

"Zhouyi Cantongqi Fenzhang Tongzhenyi" (Chapter 4, Middle Volume)

(This section contains commentary by the Song Dynasty Daoist Peng Xiao, who held the official position of Vice Minister of the Rites Ministry.)

Chapter 41 discusses the complementary relationship between Qian (Heaven) and Kun (Earth), representing strength and softness, respectively. Qian embodies firmness and dynamism, while Kun embodies receptivity and gentleness—the two interact and contain each other. Yang Qi actively gives, while Yin Qi passively receives, much like the interdependence of male and female. This interplay drives the generation and transformation of all things, allowing Jing (essence) and Qi (vital energy) to unfold naturally. The hexagrams Kan (Water) and Li (Fire) occupy the primary positions, their radiance illuminating all directions. The profound mystery within them is unfathomable and cannot be fully depicted. The sages, through contemplation and deduction, classified the primordial chaos before the division of Heaven and Earth into four fundamental elements, ultimately returning to the state of emptiness. The sixty hexagrams cycle endlessly, like preparing a chariot for a grand procession. The True Dragon and Heavenly Steed stand ready; the enlightened ruler seizes the opportune moment. When in harmony, the path is smooth and unobstructed; but if one strays onto a deviant path, obstacles arise, leading to the collapse and peril of the state.

The method of refining the Golden Elixir (Neidan, internal alchemy): First, establish the foundation of Qian and Kun (the cauldron and furnace, referring to the Dantian, the body’s energy centers). Then, allow the Yin and Yang essences to merge within, followed by the movement of Water and Fire (Kan and Li), like the convergence of the sun and moon or the union of the Dragon and Tiger (the two Qi of Yin and Yang). In this way, light manifests within the cauldron, though its profundity remains elusive. This requires studying the classics of the sages and investigating the origin of the "medicinal ingredients" (the materials of alchemy), ensuring that Qian, Kun, Kan, and Li blend seamlessly. Through the rise and fall of transformations within the six directions (up, down, and the four cardinal points), the Qi of the Five Phases (Wood, Fire, Earth, Metal, Water) unfolds. Following the pattern of the sixty hexagrams and the rhythm of the twelve double-hours (shichen), it is like preparing a chariot to welcome the True Dragon. Within the body’s Central Palace (the middle Dantian), the Golden Mother (original essence) presides, much like a ruler governing a state. By seizing the right moment and harmonizing the breath, one aligns with nature and moves unimpeded. Conversely, if the "fire timing" (control of internal heat) is mishandled, the path becomes treacherous, akin to a nation in crisis, preventing the Golden Essence within the "Divine Chamber" (Dantian) from maturing. The key to refining the Golden Elixir lies in the balance of Lead and Fire (the harmony of Water and Fire), which is the foundation of returning to the origin. All other numerical calculations of the Five Phases serve as supplementary aids.

Chapter 42 uses the metaphor of a nobleman in his chamber. When a nobleman speaks virtuous words within his room, their influence resonates a thousand miles away—just as a ruler of ten thousand chariots, though residing deep within his palace, issues decrees that must align with the laws of Yin and Yang. One must be like a warrior storing weapons, awaiting the right moment, without violating the months indicated by the hexagrams: Zhun (Difficulty) corresponds to the hours of Zi (midnight) or Shen (3–5 PM), Meng (Youthful Folly) corresponds to Yin (3–5 AM) or Xu (7–9 PM), and the remaining sixty hexagrams each have their own corresponding times.

The "Book of Changes" states that the nobleman’s virtuous words in his chamber can summon responses from afar, symbolizing the Golden Elder (original spirit) residing in the Divine Chamber (Dantian), much like a ruler dwelling in the ninefold palace. In cultivation, one must act as a ruler issuing commands, mastering the timing of fire and seasonal nodes. Zhun is best cultivated during Zi (midnight) or Shen (afternoon), while Meng is suited to Yin (early morning) or Xu (evening). Each hexagram has its corresponding hour. The key lies in maintaining a mind as clear as a ruler’s and intentions as precise as decrees, naturally resonating with the rhythms of Heaven and Earth.

In the practice of Neidan (internal alchemy), the daily application of water and fire (referring to Yin and Yang Qi) during morning and evening is akin to issuing commands, ensuring that the body's energy flows harmoniously to their proper places. The key lies in maintaining a tranquil Shen (spirit), like storing tools in readiness for the right moment, following the transformations of the hexagrams and aligning with the cycles of time. Each morning and evening corresponds to a specific hexagram, with the sixty hexagrams cycling through a month, while the hours of Yin (3-5 AM) and Shen (3-5 PM) mark the beginning and end of Yin and Yang respectively.

The "two manifestations" mentioned here refer to the operational principles of water and fire, Yin and Yang. From Zi (11 PM-1 AM) to Si (9-11 AM), the period corresponds to spring and summer, when the fire Qi is vigorous and conducive to growth—much like nurturing the Shen within the alchemical furnace, embodying the benevolent virtue of giving. From Wu (11 AM-1 PM) to Hai (9-11 PM), the period aligns with autumn and winter, when the austere Qi prevails, akin to condensing the spiritual mercury (referring to the refined essence in Neidan practice) within the alchemical embryo, embodying the principle of retribution. Wei Boyang (author of the Zhouyi Cantongqi) taught later practitioners to follow the movements of the sun and moon, grasp the waxing and waning of Yin and Yang, and adapt to the alternation of cold and heat through the transformations of the hexagrams. Only by carefully observing the shifts in Qi can one avoid errors within the alchemical cauldron—just as one guards against thieves—so that the red essence (Yang Qi) may descend and the white mercury (Yin essence) may take form, swiftly leading to the completion of the Golden Elixir.

As for the solstices (summer and winter) and equinoxes (spring and autumn), if the movement of Yin and Yang becomes disordered, unnatural phenomena may arise—such as extreme heat in winter or frost in summer. Unseasonable winds and rains, alternating droughts and floods, locust plagues, and all manner of strange occurrences may manifest, even catastrophic events like mountain collapses and earth ruptures. These anomalies may stem from fluctuations in the practitioner’s inner state—affecting oneself in the near term and others in the long term, potentially inviting misfortune or blessings, fostering peace or inciting chaos. These four outcomes all originate from the stirrings of intention within the practitioner’s heart.

Specifically, the four cardinal hours—Zi (11 PM-1 AM), Wu (11 AM-1 PM), Mao (5-7 AM), and You (5-7 PM)—correspond to the boundaries of the four seasons, with the De (virtue/power) of Earth (the harmonizing Qi) circulating at the end of each season, facilitating the generation of the dragon and tiger (symbolizing Yin and Yang Qi) of metal and wood. Not only is the division of the seasons crucial, but within the twelve two-hour periods, one must further distinguish the twenty-four solar terms and seventy-two pentads, corresponding to the annual fluctuations of Qi. The practitioner must observe these subtle shifts with the precision of an ancient water clock, meticulously attuning to every fleeting moment of energetic transformation.

This scripture discusses the critical importance of fire regulation during the alchemical process. If the yang fire (the heating force in alchemy) becomes excessively strong, it would be like the natural imbalance of floods and droughts—winter turning into scorching heat. Should the yin fu (the principles governing fire modulation) fall into disorder, causing cold and warmth to intermingle improperly, even midsummer could witness heavy frost. When the cinnabar and mercury (alchemical ingredients) within the golden chamber (the alchemical furnace) fail to develop according to their natural rhythms, the entire furnace will manifest various anomalies.

The key to successful alchemy lies in balancing the "golden tiger" (the metallic essence of the West) with the "wooden dragon" (the liquid vitality of the East), as well as harmonizing the "northern water youth" (Kan) with the "southern fire maiden" (Li). Improper fire regulation would scatter the true mercury (the refined essence of alchemy) like a filial child torn from home, causing it to disperse or even burst forth from the crucible. These auspicious or inauspicious transformations all depend on the alchemist's mastery of fire control.

If the practitioner can follow the patterns of celestial timing, adjusting the fire with the precision of measuring the sun and moon's movements, harmonious qi will coalesce within the cauldron, nurturing true quicksilver (the alchemical achievement). Movement and stillness must adhere to established principles, the four seasons must align with their natural cycles, firmness and flexibility should complement rather than conflict, and the Five Phases (Wood, Fire, Earth, Metal, Water) must remain steadfast in their positions without erratic movement. Through such cyclical circulation and repeated refinement, efficacy will naturally manifest.

During the transition between the waning and waxing moons (the lunar month's end and beginning), when yin and yang merge, it resembles the primal chaos at creation's dawn—male and female energies intertwining. At this moment, essence and qi nourish each other, and the transformations of creation flow unimpeded, revealing the unfathomable marvels of heaven and earth. The alchemist must seize this opportunity, commencing from the northeast (the Gen position) and rotating clockwise like a revolving wheel, exhaling and inhaling the breath of life. The true image emerges from the deep pool, radiating refined essence. Specifically, around the hour of Yin (3–5 a.m.), as the yang fu recedes, metal and water fuse, chaos reunites, and male and female energies harmonize, essence and qi flow to nourish the mother (the alchemical embryo), giving birth to divine spirits while simultaneously concealing form and accumulating power.

This passage explains the correspondence between "fire timing" (huohou, the regulation of breath during cultivation) in Daoist Neidan (internal alchemy) practice and lunar phases, using celestial phenomena as metaphors for the alchemical process.

When the moon first emits light from the northeast (the Gen position) and rotates rightward, it resembles the rebirth of radiance after the new moon (the first day of the lunar month). As it moves from the Ji and Dou constellations toward the west, it's like a wheel turning to sprout tender shoots—its glow gradually becomes visible, though still in a phase where yin energy lies latent, preparing to restore its full form. This symbolizes how the golden water (referring to the body's Jing-Qi essence) within the cauldron during the hours of Xu to Hai (7 PM to 11 PM) undergoes the transition between the dark and new moon, nearing Zi hour (11 PM to 1 AM) when it will sprout anew. Because the Gen position borders the Yin position (northeast), the text describes it as "vomiting the wheel and sprouting shoots"—just as the moon between its dark and new phases fills with golden water (yin energy), encountering the fire of yang energy at Zi hour at the month's start. When essence meets fire, it reignites with brightness, rotating leftward to emit sprouts, and the dragon body (yang energy) gradually takes form. Thus, the cycles of flourishing and decline are perpetual.

When the Mao and Bi constellations appear in the west, the Zhen hexagram (symbolizing nascent yang energy) reveals its signs. The first stirrings of yang are like a hidden dragon (the initial nine-line). Yang energy begins to manifest on the third day ("three days of vibration"), while the Dui hexagram (symbolizing joy) operates by the eighth day. By the second nine-line, the dragon appears in the field; by the fifteenth day, the Qian hexagram reaches perfection. At the third nine-line, one must guard against nightly depletion—this is the cyclical rise and fall of the "divine tally" (the rhythm of cultivation). The Xun hexagram (symbolizing wind) then takes charge, requiring steady handling; at the fourth nine-line, the dragon may leap or retreat, demanding careful control; the Gen hexagram (symbolizing stillness) governs until the twenty-third day, when one must maintain the half-moon state; the fifth nine-line's "flying dragon in heaven" brings great fortune; the sixth five-line's Kun hexagram (symbolizing earth) nurtures and contains; the top nine-line's "arrogant dragon has regrets" shows yang's exhaustion, yet endings birth new beginnings.

Specifically, at the month's start, the moon rises from the Mao and Bi constellations in the west, circulating yang fire (the cultivation of yang energy). By Zi and Chou hours (11 PM to 3 AM), a five-day cycle of breath begins, generating the first yang line (Zhen hexagram energy). As yang gradually grows within the cauldron, after fifteen days the pure yang Qian hexagram forms, completing the dragon body (the perfected yang form). "Yang establishes by three" refers to yang energy first spreading within the cauldron after three days of fire practice; "yin connects by eight" means that after two solar terms (two hou periods), two yang lines emerge, and by the eighth day, Dui's metal (western energy) activates—balancing golden water's breath, corresponding to the first quarter moon.

This passage elucidates the principles of Yin-Yang transformation during alchemical practice, using the hexagrams of the Zhouyi (Book of Changes) as metaphors. Metal (representing Yang) and water (representing Yin) intermingle like the first quarter moon on the eighth day of the lunar month (symbolized by the Dui hexagram), where Yin and Yang exist in equal measure.

By the fifteenth day (the third phase), the full moon resembles the Qian hexagram with its three solid Yang lines, achieving pure Yang state. Thereafter, Yin energy begins to grow as Yang declines, initiating cyclical alternation. The Xun hexagram represents Yang's recession, where one Yang line transforms into Yin, corresponding to the Wu-Wei hours (noon to mid-afternoon) when Yin gradually strengthens to envelop and contain Yang energy.

At the last quarter moon on the twenty-third day (Gen hexagram), metal and water regain equilibrium. The "flying dragon in heaven" from the ninth line of Qian signifies auspicious timing—after six phases spanning thirty days, when the Kun hexagram governs the Xu-Hai hours (7-11 PM). At this moment, the complementary energies of Qian and Kun reach fullness, the dragon (Yang) and tiger (Yin) unite, completing nature's cyclical revolution.

The Kun hexagram acts as the nurturing mother—its initial Yin line transforming into Yang creates Zhen (eldest son), progressing until full Yang becomes Qian. At Yang's zenith, Qian reverts through Xun (eldest daughter) back to complete Yin as Kun. Kun perpetually nourishes all phenomena like a mother raising her children (the hexagram manifestations), hence the sixth line of Kun declares it the fundamental law of alchemy.

The passage concludes with the "using nine" principle (Qian's top line)—when Yang reaches its apex, it yields position, embodying perpetual Yin-Yang conversion. Like the Big Dipper (Xuanji) rotating to move celestial bodies, these transformations flow endlessly through the six lines without fixed positions, revealing the Zhouyi's core principle. Through astronomical cycles and hexagram metamorphosis, this text allegorizes the essential techniques of fire regulation and Yin-Yang harmonization in alchemical practice.

This passage explains the "advancing yang fire" (jin yang huo) phase in Daoist Neidan (internal alchemy) practice, using the hexagrams from the Zhouyi (Book of Changes) to symbolize the waxing and waning interactions of yin and yang qi during the alchemical process.

The text begins with the Fu hexagram (one yang line above five yin lines), corresponding to the midnight hour (zi shi, eleventh lunar month). Here, yang qi first begins to sprout, akin to the faint yang energy forming the foundation of the elixir within the alchemical cauldron. Though subtle, this yang energy circulates throughout the body, reflecting the Yijing's statement that "in return we see the heart of heaven and earth" - the primordial beginning of all growth.

Next comes the Lin hexagram (two yang lines above four yin lines), matching the chou hour (twelfth lunar month) when yang qi gradually strengthens, just as daylight increases after the winter solstice. At this stage, the golden (jin) and watery (shui) qi within the cauldron begin interacting and condensing, forming the flowing essence of the elixir.

The Tai hexagram (three yang and three yin lines) corresponds to yin hour (first lunar month), representing perfect balance and mutual penetration of yin and yang, like the union of husband and wife. Here the essential qi of the "dragon and tiger" (lead and mercury) medicines becomes vigorous, with yin and yang transforming into each other, embodying nature's principle that "no level ground exists without slopes, no going forth without return."

Finally, the Dazhuang hexagram (four yang lines above two yin lines) aligns with mao hour (second lunar month), where yang qi becomes dominant yet still contains yin. Like elm seeds falling back to their roots in spring, practitioners must maintain yin-yang equilibrium as day and night reach balance during the spring equinox.

This scripture uses transformations in nature to illustrate the waxing and waning patterns of Yin and Yang energies during spiritual cultivation. When Yin energy dominates, it resembles the withering of elm seeds in the second lunar month as Yin intensifies; while Yang energy fosters growth, Yin's ascendancy leads to decay.

The second and eighth lunar months mark pivotal transitions in the balance of Yin-Yang forces. Though Yang gradually strengthens in the second month, residual Yin still interferes—much like how elm pods fall during mid-spring, symbolizing metallic substances (golden sand, jinsha) in alchemical practice descending with remnant Yin to settle in the Dantian (womb center). Conversely, the eighth month's dominant Yin contains latent Yang, allowing shepherd's purse to regenerate in mid-autumn, paralleling how metal-water generated energies (jin-shui) are nourished by rising Yang to fill the alchemical cauldron (inner chamber).

Chapter 53 "Resolving Yin's Retreat" depicts Yin's recession and Yang's ascent, akin to birds cleansing their feathers by shaking off accumulated dust. The Guai hexagram (one Yin line beneath five Yang lines) signifies Yang's predominance, though trace Yin persists in the cauldron—requiring the Yang fire of the Chen hour (7-9 AM) for complete purification, corresponding to the fire-applying practice during the third lunar month's Chen period.

Chapter 54 "Qian's Vigorous Radiance" reveals pure Yang at its zenith. The Qian hexagram (all Yang lines) represents cosmic creativity—from winter solstice's nascent Yang to the fourth month's perfected purity, like clouds nourishing all beings. Alchemically, this mirrors the transformation from eleventh-month energy reception to fourth-month consummation, where metallic essence (golden embryo, jintai) meets pure Yang fire to forge spiritual implements, illuminating the cauldron during the Si hour (9-11 AM). Yet within this apex lurks Yin's inevitable germination.

Chapter 55 "Gou's Inceptive Order" discloses Yin's embryonic emergence. The Gou hexagram (five Yang lines above one Yin) signifies Yin's subtle infiltration—like chill rising from a well's depths. At noon (Wu hour, Yang's zenith paradoxically termed "Declining Guest"), Yin already governs covertly. This liminal state witnesses dragon (Yang) and tiger (Yin) energies beginning their intercourse, requiring metallic implements (golden brake, jinni) to stabilize the dynamic equilibrium.

This passage describes how the changes of Yin and Yang are reflected in the alchemical process. It begins with “the first birth of Yin,” like the light frost of early winter. Though Yin Qi is still weak, it will eventually reach its height, like a cold spring at the bottom of a well: the five Yangs (Yang Qi) are abundant on the surface, but the one Yin (Yin Qi) below has begun to take the lead. This is like the Golden Mother in the alchemical cauldron—an alchemical term for a base substance such as mercury. At first it receives only a faint trace of Yin Qi, but eventually it forms an elixir as firm as ice crystals.

Next, the Dun hexagram, one of the sixty-four hexagrams of the Book of Changes, symbolizes four Yang lines and two Yin lines. As Yang Qi gradually withdraws, one must gather and restrain the true Jing—an alchemical term for the essential substance—like a recluse holding back his brilliance while awaiting the right moment. This corresponds to a stage in alchemy when the essence of the Red Dragon, referring to substances such as lead, is acted upon by Yin Qi and gradually combines with mercury. At this point, one must follow the natural changes of Yin and Yang. This stage corresponds to the sixth lunar month, when Yin Qi is growing stronger.

When the Pi hexagram, Heaven and Earth Obstructed, has three Yin lines and three Yang lines, Heaven and Earth are blocked, Yin and Yang do not interact, and the growth of all things comes to a halt. At this time, the Golden Mother (mercury) in the cauldron remains still. This corresponds to the seventh lunar month, the Shen month.

Finally, when the Guan hexagram, Wind over Earth, has two Yang lines and four Yin lines, Yin Qi has grown strong, as in mid-autumn. At this point, under the influence of Yin Qi, the metals in the cauldron merge with water, as mercury changes and begins to generate new growth. Although Yin Qi is dominant, some Yang Qi remains, producing the unusual phenomenon of an old tree flourishing again. This is a metaphor for the elixir beginning to nurture its spiritual nature in mid-autumn. Just as shepherd’s purse and wheat shoots break through the soil at this time, the elixir begins to grow and transform during this transitional phase of Yin and Yang.

This scripture primarily elucidates the principles of Yin-Yang transformation in Daoist Neidan (internal alchemy) practice and how to cultivate in accordance with natural laws.

During cultivation, just as the eighth and second lunar months demonstrate the mutual restraint of Yin and Yang, one must seize the opportune moment. When Yin energy becomes excessive (as in the ninth month), the body's vitality gradually dissipates, requiring retreat to Yin fu (methods for regulating Yin energy). Like the hexagram of "Bo" (Peeling), where a single Yang line is suppressed by five Yin lines, both metal and water (representing Jing-essence and Qi) enter a dormant state.

The Dao of cultivation emphasizes cyclical recurrence. When Yang energy reaches its zenith (as in the Qian hexagram of pure Yang), a new Yang line emerges within the Kun hexagram (pure Yin), embodying the principle that "when the Dao reaches its limit, it reverses." Heaven and Earth function like parents—only through their harmonious interaction can the myriad beings be generated. Practitioners must emulate the monthly Yin-Yang transitions of the twelve months and the hourly shifts of twelve time periods within their bodies. By facilitating the union of masculine and feminine energies (spiritual male and sacred female) within the Dantian (divine chamber), the dragon and tiger (Shen-spirit and Jing-essence) merge, the ethereal and earthly souls return to their positions, ultimately attaining boundless transformative states.

Though the workings of Heaven and Earth seem profoundly mysterious, observing the movements of sun and moon and the interactions of Yin-Yang reveals the patterns governing all growth. Cultivation requires alignment with nature, recognizing that the waxing and waning of Yin-Yang form an endless interlocking cycle. Mastering these principles enables one to achieve the enduring vision of ancient Daoist sovereigns.

Within the boundless expanse of heaven and earth, the transformations of all things remain elusive and difficult to trace. Just as the alchemical cauldron symbolizes the cosmos (with Qian and Kun representing the hexagrams of heaven and earth in the Zhouyi), and as parents embody the interplay of Yin and Yang (with Kan and Li symbolizing the water and fire hexagrams), the exact process of elixir formation within the vessel's murky, chaotic space remains invisible to the eye.

Metal (Jin) serves as the crucial material in alchemy, initially appearing in an undifferentiated state of primal yellow and black (symbolizing the unity of Yin and Yang). Gradually, Yin and Yang separate, and ultimately, the Five Phases (Wood, Fire, Earth, Metal, and Water) interact in an endless cycle. Like the waxing and waning of the moon, the advance and retreat of fire regulation, and the mutual nourishment of water and metal, these internal transformations mirror the changing of the seasons. By precisely mastering the fire timing (Fu Huo), one can eternally preserve the spiritual potency of the elixir (with "Dragon and Tiger" referring to lead and mercury, the foundational alchemical ingredients).

On the cultivation of nature and life: Those who seek longevity must understand the origin of life. The human body is initially formed from primordial Qi (Yuan Qi), much like mist condensing into shape. Wei Boyang (Master Wei) pointed out that the key to prolonging life lies in replenishing the finite physical body (inherited from one's parents) with the infinite Qi of heaven and earth (referring to the dual forces of Yin and Yang and the prenatal Jing Qi). Through refining the Golden Elixir (Jin Dan), the pure prenatal Qi transforms the physical form, ultimately achieving a body of pure Yang that endures as long as heaven and earth. The ancients taught that primordial Qi is the root of life, and after a thousand days of cultivation, the refined Yang essence never dissipates.

On the principles of Yin and Yang: Within the human body, the luminous spirit (Ri Hun, the "sun soul," representing Yang) and the shadowy essence (Yue Po, the "moon soul," representing Yin) depend on one another. Intrinsic nature (Xing) governs the inner self like the core of a fortified city, while emotions (Qing) govern the outer self like its protective walls. Only when inner and outer are harmonized can life be stabilized. In practice, one must align with the laws of heaven and earth: the Qi of heaven (Qian) moves with unyielding strength, while the Qi of earth (Kun) remains soft and receptive. Only through the balance of firmness and yielding can the Golden Elixir be perfected (with terms like "nine returns and seven reversions" referring to the cyclical stages of elixir refinement).

This passage explains the principles of mutual generation and restraint between Yin-Yang and the Five Phases in Daoist Neidan (internal alchemy) practice. When cultivating the Golden Liquid Returning Elixir (an advanced Neidan technique), one must first establish the cyclical patterns of Yin-Yang, then construct the symbolic cauldron and furnace (representing the body's inner cultivation space) mirroring heaven and earth. The sun's soul (Yang energy) and moon's essence (Yin energy) intermingle within the golden chamber (Dantian), forming the foundation for elixir refinement.

Nature (one's innate disposition), associated with Metal, governs internal cultivation—like laying a foundation before building a house. Emotion (acquired feelings), associated with Fire, governs external cultivation—like constructing city walls for protection. When Yin and Yang energies circulate within the body, the Earth phase (spleen/stomach) mediates at the center, just as a house provides dwelling for the Dao. Through mutual transformation, when Yang energy retreats and Yin energy expands, favorable conditions arise while adverse ones depart—this harmonious interplay constitutes the fundamental path of alchemy.

The numerical references "nine returns, seven reversions, eight homecomings, six dwellings" denote the generative numbers of the Five Phases: Metal's generative number is four, completion number nine; Fire's generative two, completion seven; Wood's generative three, completion eight; Water's generative one, completion six; Earth's generative five, completion ten. "White male, red female" symbolizes: Metal, originally born from Water (Yin), corresponds to the northern Kan trigram (one of the Bagua), representing the male principle within Qian (Heaven)—hence "white male" for Metal's pale hue. Fire (Yang) corresponds to the southern Li trigram, embodying the female principle within Kun (Earth)—thus "red female" for Fire's crimson color.

Within the cauldron, Metal manifests as Yang—husband to the Li maiden; outside, it transforms into Yin—wife to the Kan youth. Thus the Golden Mother (primordial Qi) receives solar energy to produce divine mercury (elixir essence). The union of Metal and Fire stabilizes true Water (kidney essence), preventing its dissipation. Water initiates the Five Phases with the generative number one—as Laozi states, "Supreme goodness resembles water," the flawless origin of all things, transparent yet elusive. The Dao's form moves hidden within the cauldron, its transformations beyond depiction. Each phase maintains its position while fire-times (mental regulation during practice) operate with seasonal precision.

The egg analogy (Chapter 64) illustrates how the inner elixir resembles yolk and white—Yin embracing Yang, nurturing life.

This passage elucidates two key concepts in Daoist alchemy: the divine chamber for elixir refinement and the resonance of Yin-Yang.

Regarding the divine chamber (the alchemical vessel), the scripture employs the metaphor of an egg: the internal structure of the alchemical cauldron resembles the layered enclosure of an egg, with its white and black portions corresponding to each other, symbolizing the harmonious fusion of metal (gold) and water. The divine chamber measures approximately one square cun (inch) and serves to contain the spiritual mercury (liquid silver). After ten months of refinement, the elixir matures like a developing fetus, acquiring a complete structure analogous to the human form—with pliable bones that can bend and a smooth texture resembling lead. The reference to Master Wei (Wei Boyang) here reveals the principle of internal-external correspondence in alchemical processes.

Elixir refinement requires specific spatial arrangements: first establishing an altar, upon which sits a furnace containing the cauldron; within the cauldron resides the divine chamber housing the "metal-water" (alchemical ingredients). The Song of the Divine Chamber by Lord Yin (Yin Changsheng) further describes the vessel's characteristics: egg-shaped with uniform yellow-white coloring, consistent thickness, and requiring complete hermetic sealing.

Concerning the principle of Yin-Yang resonance, the text provides two illustrations: using a yang-sui (ancient bronze mirror for solar ignition) to concentrate sunlight for fire, and employing a fang-zhu (ancient lunar dew collector) to gather water beneath moonlight. These demonstrate how even distantly separated Yin and Yang energies can interact—how much more so the intrinsic Yin-Yang qi within the human body. Alchemy fundamentally involves gathering the essence of heaven and earth as its foundation, combining it with solar-lunar energies as catalytic agents, and refining the elixir through the mutual nourishment of water and fire.

The passage concludes with essential cultivation techniques: sealing the three precious portals (ears, eyes, and mouth) to emulate the quiescent introspection of zhenren (perfected beings). By regulating vision, hearing, and breath, practitioners harmonize body and mind—the crux of spiritual cultivation. "Within the compass" refers to the Dantian region, while "spiral flexion" denotes the cyclical movement of qi.

This scripture elucidates the principles and methods of Daoist Neidan (internal alchemy) practice. At its core, it employs the three hexagrams from the Book of Changes (Yijing) — Kan (water), Li (fire), and Dui (metal) — to symbolize the circulation of Jing (essence), Qi (vital energy), and Shen (spirit) within the human body.

The practice emphasizes three key points: the ears (symbolized by Kan hexagram) should listen inwardly to the flow of Qi; the eyes (symbolized by Li hexagram) should gaze internally at the body's landscape; and the mouth (symbolized by Dui hexagram) should remain closed in silence. This enables the body's vital essences (referred to as "infant and maiden") to gestate naturally within the Dantian (energy center, called "Golden Mother" or "spirit chamber"). When the Yin and Yang energies ascend and descend harmoniously within — like clouds nourishing the earth with rain — the practitioner's complexion gradually becomes radiant, and their sinews grow robust.

During practice, one must eliminate distracting thoughts (called "Yin evils") and cultivate upright Qi (termed "Yang talismans"), allowing the vital essence to circulate from head to toe like melting snow. This cyclical process embodies the "dragon and tiger embracing" state of cultivation. When the body's fiery Qi (Yang energy) becomes abundant, turbid Yin energy transforms into clarity — demonstrating the natural law of Yin-Yang conversion.

The scripture concludes by explaining: closing the ears stabilizes kidney water (Kan), closing the eyes concentrates heart-mind (Shen), and sealing the lips prevents vital essence from dissipating. Through these four passages, Wei Boyang (Master Wei) metaphorically reveals the true meaning of Neidan practice.

People often pursue minor techniques while failing to comprehend the profound depths of the great Dao (the Way). They abandon the proper path to take crooked shortcuts, seeking expedient routes that instead lead to dead ends—like a blind man refusing a cane, a deaf person listening to music, diving to catch pheasants, climbing mountains to fish for dragons, planting wheat yet expecting millet, or using a compass to draw squares. Such efforts waste energy fruitlessly, with no visible results even after years of labor. In truth, authentic methods of "ingestion" (Daoist cultivation practices) should be simple and uncomplicated.

Wei Boyang (author of the Zhouyi Cantongqi) observed that worldly people delight in petty arts, chasing quick-fix shortcuts without realizing these techniques are like roads with heads but no tails—requiring immense effort yet yielding success for very few. It resembles the blind straining to see or the deaf forcing themselves to hear, or hunters and fishers straying into mountains and rivers. When one’s choices are fundamentally mistaken, how can they discern right from wrong? He advised seeking the supreme Dao (the Way) instead, for it is simple and uncomplicated. The Golden Elixir (Jindan) of reverted cinnabar, in particular, represents the peerless method for ascending in broad daylight. If one encounters an enlightened master’s guidance or a divine transmission and cultivates according to the profound oral instructions, they will grasp this principle of simplicity.

The "flowing pearl of the sun" (the essence of Yang Qi) tends to dissipate easily, but when paired with the "golden flower" (the essence of Yin Qi), it transforms into a white liquid and eventually solidifies into something firm. The golden flower appears first, soon melting into a watery state, interlocking like horse teeth—at which point Yang Qi arrives to harmonize it. This transformation occurs entirely spontaneously. When Yin Qi gathers, it resembles a mother nurturing her child; when Yang Qi circulates, it acts like a father disciplining his descendants. The Five Phases (Wood, Fire, Earth, Metal, Water) take turns governing, restraining one another: Fire melts Metal, and Metal overcomes Wood. The union of the "three-and-five" (the harmony of Yin-Yang and the Five Phases) with the Supreme Unity (Taiyi, the cosmic origin) embodies the utmost refinement of heaven and earth. These principles can be transmitted orally but are nearly impossible to fully express in writing.

The flowing pearl of the sun is the dew formed when earthly Qi resonates with celestial Qi—a pure Yang essence capable of generating all things. It has Qi but no fixed form, hence its name "Crimson Dragon." Yang Fire transforms Qi into cinnabar (a key alchemical ingredient), illustrating how Fire begets Earth, and Earth begets Metal. Metal is the dark essence of the Supreme Yin (Taiyin), nourishing all beings—it possesses both Qi and tangible substance, hence the name "Golden Flower." The Crimson Dragon originates from the Wood phase (associated with the east, symbolized by the celestial stems Jia and Yi), also called the "Azure Dragon," representing Yang, the father, the husband, and Fire; the Golden Flower, meanwhile, embodies Yin, the mother, the wife, and Water.

This scripture elucidates the principles of mutual generation and restraint between Yin-Yang and the Five Phases in Daoist alchemy. It describes the "White Tiger" representing the Metal phase of the West, belonging to Yin and symbolizing the mother, wife, and water; while the "Azure Dragon" represents the Wood phase of the East, belonging to Yang. The crux of alchemy lies in reversing Yin-Yang and enabling the Five Phases to mutually generate, much like the transformative union of husband and wife.

The poetic formula of Taibai Zhenren (a Daoist immortal) states: When the Five Phases operate in reverse, the Azure Dragon (Wood) emerges from Fire; when the Five Phases defy conventional order, the White Tiger (Metal) is born within Water. This constitutes the fundamental principle of refining the Golden Elixir (Jindan), where Dragon and Tiger (Metal-Wood) intersect and mutually generate. The elixir's refinement mirrors conjugal union producing offspring: Metal as the wife initiates the process, Wood as the husband responds, akin to the divine mother conceiving and giving birth to the "Chanü" (an alchemical term for mercury). Throughout this process, material forms undergo continuous transformation—sometimes becoming liquid, sometimes crystallizing like horseteeth—yet always retaining water's essential nature.

The text employs familial metaphors: the "compassionate mother" refers to the embryonic vessel in the alchemical cauldron, while the "filial child" denotes the produced mercury. The Yin Sovereign (ruler of Yin) explains how Yang's true cinnabar and Yin's true mercury mutually generate and restrain each other. Mercury emerging from Metal resembles children repaying maternal kindness. Dragon and Tiger (Metal-Wood) alternately inhale and exhale Qi, much like the stern father (Qian hexagram) issuing commands that direct other hexagrams and the Five Phases to jointly nurture cinnabar and mercury.

The foundation of alchemy lies in applying two key elements: lead and fire, while climatic conditions and temporal calculations serve only as auxiliaries. The scripture particularly emphasizes the triangular relationship among Fire, Metal, and Wood: Fire melts Metal, yet Fire is born from Wood, while Metal conversely restrains Wood—this mutual constraint paradoxically achieves the Golden Elixir. Ancient verses declare that cinnabar (essence of Wood) requires Metal for completion; when Fire, Metal, and Wood combine, and lead-mercury (Dragon-Tiger) mutually restrain each other, elixir refinement can be accomplished within brief periods.

Finally, it states these alchemical secrets must be transmitted orally to suitable recipients only. A commentary adds that "gender transformation" refers to the alchemical chamber reversing the usual Water-overcoming-Fire principle into Fire-overcoming-Metal. Thus mercury becomes water within cinnabar, while Metal becomes cinnabar within water—this Yin-Yang inversion embodies the profound mystery of alchemy.

These two chapters of Zhouyi Cantong Qi discuss the principles of Yin-Yang interaction and the mutual generation and restraint of the Five Phases in alchemical practice.

Chapter 69 uses the cyclical movement of the twelve earthly branches (Zi, Chou, Yin, Mao, etc.) as metaphors for controlling the firing times in alchemy. The Zi hour rotates rightward while the Wu hour revolves leftward, with the Mao and You hours serving as boundary markers representing the balanced states of Metal and Wood Qi respectively. The Azure Dragon (Wood attribute) exhales Yang Qi, while the White Tiger (Metal attribute) inhales Jing (essence), mirroring the mutual exchange between dragon and tiger. When the planet Mars (Yinghuo) moves to the western Metal position, Fire Qi presses upon Metal Qi—a natural dynamic like cats catching mice or sparrows fearing hawks—where each element fulfills its proper function, ensuring the alchemical process proceeds smoothly. The text employs the interaction between Venus (Metal essence) and the Wood of the Heavenly Stems (Jia and Yi) to illustrate how Metal, Fire and Wood mutually restrain yet harmonize within the alchemical cauldron.

Chapter 70 warns that attempting alchemy without understanding its fundamental principles will only deplete family fortunes and bring misfortune to loved ones. Throughout history countless seekers pursued the art, yet genuine success remained exceedingly rare. Wei Boyang (Master Wei) emphasizes that refining the Golden Fluid and Reverted Elixir requires authentic transmission—one must discern the proper sequence of cultivation and follow the natural correspondences between phenomena step by step to achieve complete success.

Chapter 71 expounds the mutual generation and restraint of the Five Phases: Metal, Wood, Water, Fire and Earth both control and originate from each other, much like parents conceiving life. Metal-attribute substances (father) provide fundamental form while Water-attribute substances (mother) contain nourishing energy—when essence and Qi condense into form, the immortal Golden Elixir can be forged. These transformations respond as reliably as shadows to poles or echoes in valleys, manifesting heaven and earth's most fundamental operating principles. Violating these patterns would be like comparing coarse weeds to cosmic truths—utterly missing the essential point.

This scripture primarily discusses the principle of Yin-Yang interaction and the laws of medicinal reactions in alchemical practice.

Regarding medicinal reactions, the text provides an example: When one inch of kudzu root is combined with one liang of croton seeds, ingestion will cause immediate paralysis. In such cases, even if King Wen of Zhou performed divination with yarrow stalks, Confucius interpreted the hexagrams, Bian Que applied acupuncture, or Wu Xian beat the ritual drums, none could revive the afflicted person. This demonstrates that medicinal reactions follow their own natural laws.

The mutual generation and restriction among the Five Phases (Wood, Fire, Earth, Metal, Water) resemble relationships between parents and spouses—only through the mutual dependence of Yin and Yang can the immortal elixir be forged. Those who obtain such elixirs should guard them carefully to achieve the great Dao (the Way). Just as shadows appear instantly when poles are erected, echoes rebound in empty valleys, or wild kudzu produces immediate effects upon ingestion, how much more powerful must be the supreme alchemical process of refining the Golden Fluid and Reverted Elixir?

The "River Maiden" refers to true mercury (alchemical term for quicksilver), which disperses without trace when exposed to fire. To control it, one must use "Yellow Sprouts" (true lead) as the foundational medium for nurturing and preservation.

All things possess Yin-Yang attributes. Violating this principle would be like a hen failing to hatch eggs by herself—this occurs because Yin and Yang fail to interact properly, and the Five Phases (Three-Five) remain unblended. Just as fire naturally rises and water naturally flows downward, these phenomena aren't taught by humans but follow natural laws. Observing the inseparable union during mating reveals this truth. Conception through intercourse and the cycles of life and death aren't instructed by parents but originate from primordial Yin-Yang interaction.

The Book of Changes states: "The alternation of Yin and Yang is called the Dao." Without Yin and Yang in heaven and earth, nothing could exist. Neither Yin nor Yang alone can generate anything spontaneously. Therefore, when refining divine medicines, if the Five Phases don't circulate and Metal-Wood don't interact, how can the elixir be perfected? Fire ascending and water descending are natural tendencies—by cultivating according to these patterns, miraculous Jing-Qi (essence-energy) naturally arises, all stemming from the fundamental laws of Yin and Yang.

This scripture elucidates the principles of Yin-Yang mutual generation and restraint in Daoist Neidan (internal alchemy) practice, employing natural phenomena like male-female dynamics and sun-moon relationships as metaphors for the subtle transformations during cultivation.

Regarding the symbolism of Kan-male (representing Yang within Yin) as the moon and Li-female (representing Yin within Yang) as the sun: The sun radiates energy while the moon reflects light. The moon's fullness depends on the sun's illumination—when Yin-Yang becomes imbalanced, eclipses occur. This mirrors alchemical practice where golden sand (moon essence) and fiery mercury (sun spirit) must coordinate, alternating their actions at precise temporal nodes to achieve equilibrium. The first and fifteenth days of each lunar month mark critical moments of Yin-Yang transition, when solar-lunar obscurations often manifest—symbolizing the need for exact fire regulation during elixir refinement.

The principle of metal transforming into water is explained: Metal (Jin) melts into liquid (Water) under fire, yet excessive heat dries the water (Fire transforming into Earth). This parallels sexual union where the male actively emits Yang qi while the female quietly nurtures. Practitioners must maintain perfect measure—neither excessive nor deficient—keeping moderate temperature with timely advancement and withdrawal to achieve Yin-Yang harmony. Particularly during spring and autumn (second and eighth months), metal-water energies reach optimal balance, potentially manifesting as liquid metal or dissolved metallic states.

Finally, the nature of cinnabar is addressed: Cinnabar's fundamental quality belongs to Wood, requiring combination with Metal. In practice, metal-water forms one pairing while wood-fire constitutes another. These four elements interact systematically to form the foundational combinations for alchemy. Just as male-female union enables reproduction in nature, elixir refinement requires all elements to interact according to specific patterns to refine authentic Jing (essential substance for cultivation).

This scripture primarily expounds on the theories of Yin-Yang and the Five Phases (Wuxing), as well as the dragon-tiger copulation in Daoist Neidan (internal alchemy) practice. The text employs symbolic representations of the Five Phases, internal organs, and directional orientations to describe the energetic transformations during cultivation.

The text first explains how the five zang organs correspond to the Five Phases: the liver belongs to Wood and manifests as green (symbolizing Yang), the lungs correspond to Metal and appear white (representing Yin), the kidneys relate to Water and show as black, while the spleen connects with Earth and displays yellow. The spleen's Earth element (represented by the celestial stems Wu and Ji) serves as the crucial mediator harmonizing Yin and Yang, much like how all medicinal ingredients in alchemy must ultimately return to Earth. Cinnabar (symbolizing the original spirit, Yuan Shen) shares its fundamental nature with Metal (lungs), which in turn generates Water (kidneys). Through the action of Fire (heart), cinnabar is produced. These four energies—Metal, Wood, Water, and Fire—mutually transform, creating the state of dragon (Yang) and tiger (Yin) copulation.

The scripture then explains the concept of "alternating dominance between hardness and softness": the dragon (Yang) resides in the west while the tiger (Yin) dwells in the east, mirroring the opposition between Mao (east) and You (west). When Yin and Yang meet, there exists both mutual conquest (restriction) and mutual generation (nourishment). Phenomena like elm trees shedding leaves in the second lunar month and wheat growing in the eighth month demonstrate these cyclical waxing and waning patterns of Yin and Yang. Practitioners must align with these natural rhythms, initiating cultivation during Zi hour (midnight) when Yang energy first emerges, regulating breath to harmoniously blend Yin and Yang energies.

Through extensive metaphors, the scripture illustrates how Neidan practice must accord with natural Yin-Yang transformations and balance the internal Five Phase energies, ultimately achieving the union of dragon and tiger and the coagulation of the Golden Elixir (Jindan). The mentioned temporal cycles and directional orientations correspond to specific energetic states, requiring practitioners to precisely apprehend these opportune moments.

The refinement of the Golden Elixir (Jindan) must adhere to the natural principle of Yin-Yang harmony. Just as wheat sprouts require the proper season to grow, alchemy must align with the cyclical waxing and waning of Yin and Yang. The southern direction (Li trigram) belongs to Fire yet harbors hidden softness (Yin), while the northern direction (Kan trigram) belongs to Water yet contains latent strength (Yang). The number one represents Yin, and nine represents Yang—this cyclical interplay of opposites is the crux of elixir refinement.

The text employs an allusion from the Classic of Poetry about paired ospreys to illustrate: the male does not dwell alone, nor does the female remain solitary, just as the intertwined turtle and snake symbolize Yin-Yang union. Forcing two Yin energies (e.g., two women cohabiting) or two Yang energies together would be as absurd as patching a pot with glue or curing fever with ice water. Even if the Yellow Emperor (legendary progenitor of alchemy) personally tended the furnace, the Great One (Taiyi, deity governing alchemy) controlled the fire, the Eight Immortals (Ba Gong, Han dynasty alchemists) pounded herbs, and the Prince of Huainan (a nobility obsessed with alchemy) prepared ingredients—with altars consecrated, rare offerings presented, and devout prayers offered—violating Yin-Yang principles would still render the elixir unattainable.

To refine the Liquid Gold Reverted Elixir (advanced alchemical substance), one must first comprehend the relationship between lead (symbolizing true Yin) and fire (symbolizing true Yang). Isolated Yin cannot generate life; isolated Yang cannot take form. They must merge like the dragon-tiger encounter or marital union, for as a lone hen cannot hatch eggs and two women sharing a carriage cannot harmonize, all creation relies on Yin-Yang interaction. Authentic elixirs require harvesting the purest Yin and Yang essences from heaven and earth as their foundation. Mistakenly using external materials like metals, minerals, or herbs—no matter how elaborate the rituals—will ultimately prove futile.

This passage uses everyday metaphors to illustrate the futility of cultivation without proper understanding. It's like trying to mend a broken pot with glue, applying arsenic to heal a wound, or forcing a turtle to fly and a snake to dance—all fundamentally impossible endeavors.

The Zhouyi Cantong Qi (Token for the Unity of the Three in Accordance with the Book of Changes) is a crucial alchemical scripture in Daoism. Here, these absurd analogies criticize those who fail to follow correct cultivation methods. Peng Xiao, the commentator of the Zhouyi Cantong Qi Fenzhang Tongzhen Yi (True Meaning of the Zhouyi Cantong Qi in Chapters), emphasizes that cultivating the Great Dao of the Golden Elixir (Jindan) requires mastering the principle of "water and fire complementing each other" (shuihuo jiji). If one violates natural laws like the misguided actions described, the effort will ultimately be in vain.

The imagery of "flying turtles and dancing snakes" is particularly vivid. The turtle symbolizes the Yang within Water (represented by the Kan trigram), while the snake represents the Yin within Fire (the Li trigram). Each has its inherent nature—forcing them to act against it is akin to defying the natural principle of Yin-Yang interaction. This passage warns practitioners to align with the Dao of Heaven and Earth’s Yin-Yang harmony, never forcing what goes against nature.