《周易參同契分章通真義》

This scripture primarily discusses the integration of Daoist alchemy with the philosophy of the Book of Changes (Zhouyi), as annotated by the Song Dynasty Daoist Peng Xiao. Here is a modern interpretation of its core content:

The text first establishes that the Qian (Heaven) and Kun (Earth) hexagrams form the fundamental gateway to transformation in the Zhouyi, akin to parents giving birth to all things. The Kan (Water) and Li (Fire) hexagrams function like an axle driving cyclical movement. In the primordial state of cosmic formation (the stages of Taiyi and Taichu), there existed a formless chaos containing the most refined "Qi of True Oneness (Zhenyi zhi qi)," which serves as the origin of heaven, earth, and all phenomena. As this primordial Qi (Yuanqi) differentiated, the concepts of heaven and earth (Qian and Kun), Yin-Yang, the Three Powers (heaven, earth, and humanity), and the Five Phases (Wuxing) emerged.

Wei Boyang (Master Wei) proposed that the principles of refining the Golden Elixir (Jindan) mirror the creative processes of the cosmos. This requires: 1) gathering the Qi of True Oneness from the primordial chaos as its foundation; 2) observing the cyclical patterns of Qian and Kun as its guiding laws; and 3) following the waxing and waning of Yin-Yang represented by the Kan and Li hexagrams to regulate the "fire times" (huohou). Specifically, Qian and Kun symbolize the cauldron and furnace of alchemy, while Kan and Li represent the structure of the furnace itself. Water and fire serve as metaphors for the harmonious interplay of Yin-Yang, and the Five Phases operate to condense the vital essence (Jing). The entire alchemical process resembles the movement of the sun and moon, strictly adhering to the 384-line cycle (the total number of lines in the Zhouyi).

The second section elaborates further: The four hexagrams of Qian, Kun, Kan, and Li (two pairs of Yin-Yang hexagrams) form an energetic circulatory system for alchemy, functioning like a bellows (tuoyue) to drive the transformation of Yin and Yang. Practitioners must act like skilled charioteers, meticulously following the rules and rhythms: internally mastering the cadence of Yin-Yang (like musical tones and calendrical cycles), while externally aligning with lunar phases (marked every five or six days), ensuring complete synchronization between cultivation and natural laws.

(Note: The term "Golden Fluid Returned Elixir" (Jinye huandan) refers to the highest attainment in Daoist internal alchemy (Neidan), while "bellows" (tuoyue) metaphorically represents the propulsive force of Yin and Yang Qi.)

This passage explains the method of using the sixty-four hexagrams from the Zhouyi (Book of Changes) to regulate the "firing times" (huohou) in Daoist Neidan (internal alchemy) practice. When cultivating the Golden Fluid Reverted Elixir (a refined form of internal alchemy), the "cauldron and furnace" (symbolizing the human body as an alchemical vessel) contains the "Golden Mother's Blossoming Pool" (referring to the convergence of Jing and Qi in the Dantian), also called the "Golden Womb Spirit Chamber." The entire process takes the four hexagrams of Qian (Heaven), Kun (Earth), Kan (Water), and Li (Fire) as its foundation, functioning like the pivotal hinge of a medicine pouch.

In practical application: the workings of the "Yin-Yang cauldron and furnace" (representing the two states of cultivation) and the application of "firm fire and gentle talismans" (referring to strong and mild firing phases) all follow the cyclical patterns of the sixty-four hexagrams. The four seasons, twenty-four solar terms, and seventy-two climatic periods of a year are condensed into a single month, and the monthly climatic changes are then mapped onto the twelve two-hour periods of a day. By precisely calculating time (using water-clock measurements) and seizing the critical moments of Yin-Yang transition (the "two crescents" and the midnight/noon points), one aligns with the operating rhythms of heaven and earth.

If practitioners can accurately master these firing phase transitions, they can harmonize the external "Yin-Yang correspondences" (natural laws) with the internal "dragon-tiger coupling" (the fusion of Jing, Qi, and Shen). Just as skilled craftsmen follow their plumb lines and experienced charioteers control their reins, alchemists must strictly adhere to these principles.

Regarding specific hexagram applications: the thirty days of a month correspond to sixty hexagrams (one each for day and night), supplemented by the four foundational hexagrams (Qian, Kun, Kan, Li), making sixty-four in total. Here, the hexagram lines symbolize the warp and weft (main framework) of daily practice, while the "pitch-pipes and calendrics" (temporal rhythms) serve as auxiliary guides. The attributes of Yang firmness and Yin softness manifest through the mutual generation and restraint of Water, Fire, Metal, and Wood.

Chapters three and four elaborate: beginning with the new moon (shuodan), the Zhun hexagram governs daytime and the Meng hexagram governs nighttime, rotating sequentially. By month's end, the Jiji and Weiji hexagrams symbolize the cyclical interplay of Yin-Yang and light-darkness. Each two-hour period follows corresponding patterns of movement, stillness, morning, and evening in continuous cycles. The entire cultivation process revolves ceaselessly like the sun and moon's motion, requiring precise mastery of firing phase transitions at every stage.

This scripture primarily discusses the laws of Yin-Yang transformation in alchemical practice and how to cultivate the Golden Elixir (Jindan) in harmony with the cycles of the four seasons and Five Phases (Wuxing). Let me explain section by section:

The dynamic interplay of Yin and Yang circulates through the twelve two-hour periods of the day. From Zi hour (11pm-1am) to Si hour (9-11am) marks the ascending phase of Yang energy (Yangqi), when internal cultivation should be emphasized. From Wu hour (11am-1pm) to Hai hour (9-11pm) is the Yin-dominated period, requiring focus on external regulation. Yang energy grows from Zi hour, peaking at Si hour, while Yin energy strengthens from Wu hour, reaching its zenith at Hai hour. This cyclical waxing and waning mirrors the progression from the Fu hexagram (symbolizing Yang's rebirth) to the Kun hexagram (representing pure Yin) in the Book of Changes (Yijing).

Cultivation should follow the seasonal rhythms of reward and punishment. Spring's vitality resembles reward, while autumn's austerity represents punishment. The three periods Zi-Chou-Yin correspond to spring, Mao-Chen-Si to summer - these are for Yang fire cultivation. Wu-Wei-Shen align with autumn, You-Xu-Hai with winter - these are for Yin talisman practice. Regulating the "fire times" (huohou) across the twelve periods must perfectly synchronize with the Five Phases and the natural cycles of day/night and hot/cold seasons, without the slightest deviation, for the Golden Elixir to succeed.

Ancient immortals left this verse: "Those who attain the Dao (dedao zhiren) grasp creation's mysteries, drawing solar and lunar essences into the alchemical furnace. Through subtle methods, they invert Yin-Yang and command spirits. Only those truly comprehending the movements of the sun-moon's hunpo (ethereal and corporeal souls) can achieve genuine immortality." Refining the golden liquid-returning elixir must emulate heaven-earth's natural operations, or success remains elusive.

"Establishing heaven-earth's positions" means the alchemical tripod (furnace) must imitate cosmic structure. After Qian (heaven) and Kun (earth) fix their positions, Kan (water) and Li (fire) circulate and transform within. These two hexagrams have no fixed locations, flowing endlessly through the six voids (six directions) while encompassing all things - the fundamental principle of cultivation. The furnace's design precisely replicates this heaven-earth communion (as in the Jiji hexagram) pattern.

This scripture elucidates the core principles of Daoist alchemy, revolving around key concepts such as Yin-Yang, Kan-Li (Water-Fire), and the Dragon-Tiger symbolism.

The text first explains the operation of Yin-Yang: During alchemical practice, the cauldron (alchemical furnace) emulates the cosmic structure of Heaven (Qian) and Earth (Kun), within which the Golden Mother (alchemical ingredients) is placed. The Kan (Water) and Li (Fire) energies have no fixed positions, as the movement of water and fire follows unpredictable dynamic patterns, circulating through six directional phases. They manifest intermittently—sometimes active, sometimes latent—serving as the fundamental agents of all transformations, much like the guiding principles of the Dao itself.

The chapter "Using Non-Being to Govern Being" states: Formless Qi can control material substances. Here, "Non-Being" refers to the Dragon (mercury, representing Yang), while "Being" denotes the Tiger (lead, representing Yin). Lead and mercury cannot spontaneously transform within an empty cauldron; they require the ascending-descending movement of Kan-Li energies, just as the cyclical progression of seasons enables elixir formation. This mirrors the principle of employing an empty cauldron to govern the tangible through the intangible. The Dragon-Tiger Classic explains how Yin and Yang mutually regulate each other: The Vermilion Bird (fire) burns within emptiness, causing Yin to wax as Yang wanes, or Yang to rise as Yin recedes—with each fluctuation, the Kan-Li energies transform accordingly.

The "No Careless Words" chapter emphasizes: The sage's teachings are always substantiated. By observing celestial movements (sun and moon) and spiritual transformations, analyzing hard-soft attributes, and using metal-water metaphors for Dragon-Tiger dynamics, practitioners harness Yin-Yang to collect essential energies. Within the seasonal cycles, the four colors (azure, red, white, black) occupy their respective directions, yet all rely on the central Earth phase (represented by the Wu-Ji celestial stems in alchemical terminology, symbolizing the cauldron's inner chamber). The Wu within Kan symbolizes lunar essence (Yang within Yin, like the metal Tiger born from water), while the Ji within Li represents solar radiance (Yin within Yang, like the mercury Dragon born from fire). Thus, alchemy requires gathering solar-lunar essences and harmonizing Yin-Yang energies. When celestial revolutions complete their course and Yin-Yang transformations culminate, the entire process owes its success to the nurturing virtue of Earth (Tu De), ultimately achieving the elixir's divine efficacy.

Note: Kan-Li represent the Water and Fire trigrams from the Bagua. Dragon-Tiger and lead-mercury are alchemical terms denoting substances with opposing Yin-Yang attributes. Wu-Ji are celestial stems corresponding to the central Earth position in alchemy.

The Zhouyi Cantong Qi (Token for the Agreement of the Three According to the Book of Changes) here discusses the transformations of Yin-Yang and the principles of alchemical practice. The "Yi" (referring to the Yijing or Book of Changes) reveals the patterns of heaven and earth through the symbolism of the sun and moon's movements. These celestial bodies represent the most evident manifestations of Yin and Yang—the waxing and waning of Yang and Yin resembles the turning of a wheel, with the two Qi (vital energies) alternating in expansion and contraction. Just as the Yijing contains 384 Yao (the Yin and Yang lines in hexagrams), its 64 hexagrams all mark the transformations between Yin and Yang.

From the last day of the lunar month (Hui) to the first day (Shuo), the Zhen hexagram (symbolizing the initial birth of Yang) begins to receive the refined Qi of heaven and earth. At this time, the essences of heaven and earth unite, and the sun and moon attract each other. The masculine Yang Qi disseminates its mysterious energy, while the feminine Yin Qi nurtures a yellow embryo. In this state of primordial chaos (Hundun), Yin and Yang merge—like establishing a foundation to cultivate an embryo, where condensed Shen (spirit) takes form. All life's movements and transformations follow this principle.

The process of refining the Golden Elixir (Jindan, in Waidan or external alchemy) similarly mirrors the union of sun and moon, requiring the fusion of their Yin and Yang essences. These refined Qi circulate like day and night, endlessly recurring according to the patterns of the 64 hexagrams and 384 lines. The "fire times" (Huohou, temperature control in alchemy) must align with the advance and retreat of Yin-Yang: when Yin Qi arrives, Yang Qi lies dormant; the energies of east and west intersect like the union of husband and wife. At this moment, the Zhen hexagram receives its talismanic mandate, the spirits of heaven and earth couple, and the hun (ethereal soul) and po (corporeal soul) of sun and moon merge.

The so-called "primordial chaos" (here referring to the alchemical cauldron) resembles an egg, embodying the state where the upper and lower lunar phases (first and last quarters) unite. The Yang dragon and Yin tiger (symbolizing lead and mercury, or other alchemical materials) resonate within this chaos, establishing a foundation to nurture the embryo until it finally coalesces into the elixir. Thus, the alchemical cauldron becomes a microcosm of heaven and earth—all life's movements originate here. The masculine Yang belongs to heaven as the color dark blue (Xuan), while the feminine Yin belongs to earth as yellow, representing the ultimate principle of Qian (Heavenly Father) and Kun (Earthly Mother) in applying fire times.

The creative transformations within the cauldron perfectly mirror celestial movements. If fire times are misapplied—like erratic alternations of cold and heat—how could heaven and earth orderly generate the myriad things? And how could the dragon and tiger couple (symbolizing alchemical reactions) occur if Yin and Yang fall into imbalance?

Later, the text mentions Confucius (Zhongni) praising the primordial virtue of Hongmeng (undifferentiated chaos) and examining the era of the ancient Yuanhuang. The "Guanju" (first poem in the Book of Songs) depicts the intertwining of Yin and Yang Qi, akin to the sprouting state of nascent life. Here, the marital imagery from the Book of Songs metaphorically illustrates the initial union of Yin and Yang.

Confucius, in his exposition of the Way of Heaven and Earth in the Book of Changes (Yijing), regarded Qian (Heaven) and Kun (Earth) — representing Yin and Yang — as the foundation of all things, while taking the Xian (Influence) and Heng (Constancy) hexagrams as the origin of marital relationships. This is akin to opening the primordial chaos (Hongmeng), revealing the operations of spirits (Shen) and ghosts (Gui), and penetrating the principles governing Heaven, Earth, and the myriad beings. The relationships between ruler and subject, father and son, husband and wife, male and female, as well as the cycles of mutual generation and restraint among the Five Phases (Wood, Fire, Earth, Metal, Water), and the mysteries of transformation in all things are all manifested therein.

Wei Boyang (Lord Wei) employed the principles of the Book of Changes as metaphors for alchemical practice, establishing the theory of the cauldron and vessel (alchemical apparatus) to emulate the patterns of Heaven and Earth’s movement. Just as the Dragon and Tiger (the Qi of Yin and Yang) unite, or as husband and wife join in union, the initial stage of alchemy is entirely formless and without substance, resembling the undifferentiated state of primordial chaos. Once the firing process (huohou, the alchemical fire technique) is applied, the vital essences (Jing) of male and female (Yin and Yang) begin to intermingle, much like the imagery in the Book of Songs (Shijing) where men and women yearn for one another, seeking marriage and union. From the moment the fire is lit in alchemy, the stage of gestation and new life begins, and as the sun and moon move, the forms of the Dragon and Tiger (Yin and Yang Qi) gradually take shape.

Sages do not emerge without cause—they comprehend the Dao of Heaven by observing celestial phenomena. The advance and retreat, bending and stretching of these celestial movements correspond to seasonal changes, which is why the Book of Changes encapsulates the essence of Heaven’s Dao. The sage Fuxi, by observing the patterns of Heaven above and the configurations of Earth below, determined the number of hexagrams, comprehended the principles of all things, and left behind revelations for later generations. This allows those who have yet to awaken to the Dao to glimpse the mysteries of Heaven and Earth, "steal" the essence of Yin and Yang, recognize the root of creation (Zaohua), and discern the manifestations of omens. The cycles of mutual generation and restraint, advance and retreat, bending and stretching—all are grasped within this framework. Thus, it is said that the Book of Changes governs the "Heart of Heaven."

Therefore, one must emulate celestial phenomena, gather the most refined substances, set up the cauldron and furnace (alchemical apparatus), regulate the firing process, follow the water-clock (kelou, timekeeping device) to mark the hours, and use the hexagrams and lines to calculate the solar terms—thereby exhausting the grand patterns of Heaven and Earth’s movements.

The Fu hexagram (Earth over Thunder, symbolizing Return) represents the sprouting of new life, like the eldest son inheriting his father’s legacy while relying on his mother to establish his foundation. The waxing and waning of Yin and Yang resonate with musical tones, while their ascent and descent follow the rotation of the Northern Dipper. On the third day of the lunar month, the faint light of the new moon appears, corresponding to the Zhen (Thunder) hexagram in the east and the celestial position of Geng. On the eighth day, the moon reaches its first quarter, corresponding to the Dui (Lake) hexagram in the west and the position of Ding, with the moon’s phase appearing straight as a plumb line. By the fifteenth day, the moon is full, and the Qian (Pure Yang) hexagram is fully manifest in the east, with both the toad (Chanchu, symbolizing the moon) and the rabbit’s essence (Tupo, lunar essence) visible, and the Qi of the sun and moon shining brightly together. The toad corresponds to the hexagrams and solar terms, while the jade rabbit exhales and inhales, generating light. After the cycle of seven or eight days (one solar term), the moon begins to wane from fullness.

The Fu hexagram’s initial establishment and sprouting, where the eldest son inherits the father’s form while relying on the mother’s foundation, refers to the transformation of the bottom line of the six-Yin Kun (Earth) hexagram into a Yang line, forming the Fu hexagram with its single Yang at the beginning—hence the phrase "establishing the sprouting." This occurs when the Qian (Heaven) line transforms within the Kun hexagram, creating the Zhen (Thunder) nucleus at its core, while the outer trigram remains Kun (Earth).

This scripture employs the waxing and waning of the moon as a metaphor for controlling the firing process (huohou) in alchemical practice, illustrating the principles of Yin-Yang transformation. The moon's first crescent appearing on the third day resembles the Zhen trigram (one of the Bagua, representing thunder) gestating all things, forming the foundation of alchemy. By the eighth day when the moon becomes a first-quarter moon, Yang energy accumulates to half, analogous to the equal balance of gold (Yang) and water (Yin) within the alchemical furnace. At full moon on the fifteenth day, pure Yang manifests completely, mirroring the state of the Qian trigram (the pure Yang hexagram).

From the sixteenth day onward as the moon wanes, the practitioner must gradually reduce Yang fire and shift to Yin regulation (Yinfu, the modulating Yin energy). Just as the moon returns to balanced Yin-Yang at the last-quarter phase on the twenty-third day, the lunar cycle culminates in complete disappearance by the thirtieth day when Yin energy exhausts itself. Yet this cycle never ceases—like the moon's rebirth, alchemical practice requires continuous cyclical adjustment of firing temperatures.

The text further correlates the celestial stems Ren and Gui (associated with Yin) with Jia and Yi (Yang), showing how the Qian and Kun trigrams encompass the entire cycle. The numbers seven-eight (lesser Yang-lesser Yin) and nine-six (greater Yang-greater Yin) correspond to lunar phases, with thirty days completing one full Yin-Yang cycle—when Yang energy exhausts itself, it inevitably regenerates. The arrangement and movement of the Bagua follow celestial patterns like the sun, moon and stars, with the essential principle being mastery of the Middle Way in Yin-Yang equilibrium.

Through lunar phases and the Bagua symbolic system, this passage details the precise control of alchemical firing: Yang fire should increase gradually during the waxing moon, then transition to Yin regulation during waning phases, mirroring the moon's perpetual cycle. Throughout this process, the proportion of gold (symbolizing original essence, Yuanjing) to water (symbolizing primordial energy, Yuanqi) and the transformation of Yin-Yang energies must be meticulously calibrated to successfully refine the elixir.

This passage from Zhouyi Cantongqi primarily discusses the regulation of fire phases during alchemical practice in harmony with the cosmic patterns of Yin-Yang.

In the thirty-day alchemical cycle, one must follow the waxing and waning rhythms of Yin and Yang: the first seven and nine days correspond to Yang numbers, while six and eight days align with Yin numbers, with Qian (Heaven) and Kun (Earth) each occupying half the period. By the thirtieth day, the cyclical movements of Yin fu (Yin energy) and Yang huo (Yang energy) complete their course. Throughout the month, fire regulation must strictly adhere to the patterns of the Bagua (Eight Trigrams) and celestial motions.

Practically, the correspondences between midnight and noon, east and west, extraction-addition (fire regulation) and ascent-descent (energy flow) must facilitate the natural unfolding of Yin-Yang energies, harmonizing metal (lung Qi) and water (kidney Qi). Improper fire control resembles climatic extremes of drought or flood—disrupting generative principles and destabilizing the dragon (Yang) and tiger (Yin) forms. Practitioners must meticulously contemplate these dynamics.

"Primordial Jing" refers to the divine essence within the alchemical furnace, the most fundamental Qi between heaven and earth. Though intangible and invisible, it generates all things through the mechanisms of creation. Since direct observation proves difficult, practitioners rely on omens for verification and establish standards for guidance. By observing celestial phenomena above and terrestrial patterns below while aligning with seasonal nodes, one unites the celestial and earthly spirits in Yin-Yang harmony. Through establishing the trinity of heaven, earth, and humanity—guided by trigrams and line statements—the practitioner orchestrates daily rhythms of ascent-descent, ensuring cosmic equilibrium and dragon-tiger convergence.

The text particularly emphasizes strict chronological precision in fire regulation, knowing precisely when to advance or withdraw in complete accordance with solar, lunar, and stellar movements. Only then can the alchemical vessel emulate seasonal transitions to nurture all things and produce miraculous Jing-Qi. How could practitioners not approach this with utmost reverence?

Regarding "the first principle of governance," this denotes the initial steps of fire regulation. After casting the metal furnace, one must first ensure absolute sealing of the vessel. Then unfolds the essential method—like grasping the pivotal positions of the Northern Dipper. Internal transformations of the trigrams manifest externally as auspicious or ominous signs, while the trajectories of the five planets must align with celestial timing. Should the twenty-eight lunar mansions deviate from their courses, Yin-Yang disharmony inevitably arises.

This scripture primarily discusses the importance of internal-external harmony in alchemical practice and the consequences of disregarding natural laws.

During alchemical refinement, the golden water (referring to the two energies of Yin and Yang) within the body must mutually depend on and harmonize with each other. Just as the Big Dipper follows the cycle of the four seasons and the Twenty-Eight Lunar Mansions (four times seven equals twenty-eight) must move in orderly succession, any disruption in celestial patterns or inaccurate timing will affect the auspicious or inauspicious outcomes of the alchemical process. If external fire regulation (temperature control during refinement) becomes disordered, the internal Qi mechanisms will likewise fall into disharmony. Just as misaligned stars in the heavens lead to seasonal irregularities and the failure of life to flourish, improper fire regulation in alchemy will prevent the formation of the elixir within the cauldron.

The Star of Culture and Prosperity (Wenchang), which governs literary fortune, oversees celestial officials much like the human court has officials performing their respective duties. The Wenchang constellation consists of six stars: Supreme General, Secondary General, Noble Minister, Director of Fate, Director of Records, and Director of Calamities. The Three Platforms stars (six stars beneath the Big Dipper) assist the Celestial Emperor in governing all things between heaven and earth. The same principle applies to alchemy—the cauldron must receive the refined Qi of all things in creation to succeed. If Yin and Yang fall into disharmony or the seasons lose their order, just as an alchemist mismanages fire regulation, blame will follow. The key to the Golden Liquid Reverted Elixir (an advanced alchemical technique) lies in the coordination of lead (representing material foundation) and fire (representing energy). Obtaining true lead (high-quality material) is difficult, but mastering true fire (precise temperature control) is even harder.

The sun embodies the refined essence of the Five Phases, while the moon follows the six pitch-pipes (here symbolizing natural laws). Their thirty-day cycle repeats endlessly. If the ruler (symbolizing the guiding factor in alchemy) becomes arrogant and strays from the proper path, or if the ministers (symbolizing supporting factors) act deceitfully and disregard regulations, anomalies in lunar phases will arise, bringing misfortune. This serves as a warning to alchemists to adhere to natural laws and avoid reckless action.

This passage expounds the principles of Yin-Yang harmony and the cyclical movement of the Five Phases in Daoist Neidan (internal alchemy) practice. It begins by using celestial phenomena as metaphors for the alchemical process: the moon's waxing and waning cycles (referred to as "lülü" or musical pitch pipes, here symbolizing the ebb and flow of Yin and Yang), while the movements of the sun, moon, and five planets (Wood, Fire, Earth, Metal, Water) mirror the rising and descending of Yin and Yang energies within the alchemical furnace.

During the alchemical process, one must regulate the Qi movement between the Zi (northern Water) and Wu (southern Fire) positions representing Yin and Yang, allowing the essences of the Five Phases to intermingle with solar and lunar essences. This resembles the cyclical alternation of prosperity and decline in nature (referencing the Pi and Tai hexagrams from the Yijing), where life and death succeed each other in endless cycles. The Kun hexagram symbolizing earth functions like the central chamber (Dantian) in alchemy - its marvelous workings embody Earth's Virtue (De) that governs the entire process.

When errors occur in the alchemical operation, it resembles misgovernance of a state: if the ruler (symbolizing the true intention in the central chamber) becomes arrogant and self-satisfied, the four directions (representing the Qi of Five Phases) cease their tribute; if ministers (symbolizing the essences of Five Phases and six pitch pipes) become treacherous, it leads to disordered moon phases (referring to lunar phase changes) and temporal deviations. Ultimately, such faults trace back to the ruler - in alchemical terms, this means the Golden Essence (primordial Qi) and the Divine Chamber of Earth's Virtue (Dantian). Should the practitioner err in controlling the firing process, it causes the escape of the Charming Maiden (mercury, symbolizing the original spirit) and loss of the Red Dragon (lead, symbolizing original essence), depleting the vital energies and rendering the Golden Elixir (Jinye) unattainable.

Chapter 20 "The Polar Star Receives Rectification" explains key cultivation principles: The North Star (Chenji) remains unmoving like a ruler seated in the Mingtang (imperial audience hall), governing without deviation. Practitioners must internally guard the Dantian (self-nurturance) while maintaining a state of emptiness and Wuwei (non-action). The originally concealed inner radiance (primordial spirituality) will naturally illuminate the entire body. One must seal the sensory gates (represented by the Dui trigram symbolizing the mouth) and stabilize the spiritual root (primordial Qi).

In actual practice: The spiritual embryo (nascent inner elixir) resides peacefully in the central chamber like the North Star commanding constellations. The Qi of Yin-Yang and Five Phases act as ministers - when the ruler (spiritual intention) remains upright, the golden-water essences (original essence and Qi) within the furnace naturally transform. Gold's inherent luminosity (hidden brilliance) shines brighter with proper firing. After sealing the crucible, refine and nurture the spiritual mercury (original spirit) with the three lights' true essence (sun, moon and stars representing essence, Qi and spirit). Here the three lights simultaneously represent the inner cultivation's Yang fire, Yin tally and golden embryo, corresponding to the dynamic changes of temporal firing cycles.

This passage elucidates the profound principles of Yin-Yang transformation during the alchemical process. When refining the Golden Elixir (Jindan), the lead and mercury undergo unpredictable changes within the cauldron. Only by adhering to the laws of the Dao can one properly regulate them, ensuring the harmonious union of the two Qi energies (symbolized as dragon and tiger). As the Scripture of the Hidden Talisman (Yinfu Jing) states, by comprehending the patterns of the cosmos, all transformations of things become manageable.

Chapter 21 employs plant growth as a metaphor for the alchemical process: Initially, the lead and mercury (alchemical ingredients) receive the refined Qi of heaven and earth within the cauldron, much like a seed sprouting. With proper regulation, they develop like a tree growing from its trunk to bear fruit. Here, the "One" refers to water (true water in alchemical terminology), which contains true gold (the essence of alchemy), though ordinary people cannot perceive its hidden profundity.

Chapter 22 discusses the coordination of "upper De (Virtue)" and "lower De" in alchemy: Upper De remains tranquil and wuwei (non-active), like water (representing the state in the upper part of the cauldron), while lower De operates ceaselessly, like fire (the heating at the bottom). The harmonious interaction of water and fire (Yin-Yang balance) mirrors the harmonious union of heaven and earth. The upper part is sealed to preserve the essence (called "being"), while the lower part's fire regulation provides energy (called "non-being"). The energy generated by fire regulation nourishes the "spiritual embryo" (the nascent form of the elixir) within the cauldron. Only through the mutual cooperation of Yin and Yang Qi can the divine elixir be perfected. Wei Boyang (Master Wei) clarifies this core principle of alchemy in this chapter.

The title of Chapter 23, "Knowing the White, Guarding the Black," originates from the Daode Jing. Here, it signifies understanding the Yang (white) while preserving the Yin (black), maintaining a state of Yin-Yang equilibrium. This section emphasizes that alchemy must follow the natural laws of Yin-Yang mutual generation and the harmony of water and fire. Through the coordination of upper and lower, movement and stillness, the elixir can ultimately be perfected.

This scripture primarily elucidates the interrelationships between gold, water, mercury and other substances in Daoist alchemy (Neidan), along with their transformational principles during the alchemical process.

It begins with the principle of "knowing the white yet guarding the black." White represents metallic essence (Jing of metals), while black symbolizes the aqueous foundation. Water serves as the pivot of the Dao (the Way), numerically represented as one, marking the inception of Yin-Yang. Within the mysterious water lies the "yellow sprout" (a substance formed in early alchemical stages), which constitutes the root of all metals. The Northern River Chariot (a metaphor for the dynamic interplay of water and fire in alchemy) resembles lead—black in appearance yet containing golden radiance within, much like an eccentric scholar clad in coarse garments but carrying precious jade.

Gold generates water, making it water's mother. Yet gold also hides within water, akin to a mother concealed within her fetus. Water, as gold's offspring, in turn resides within its mother's womb. This relationship is profoundly mysterious, appearing both existent and non-existent, like objects alternately sinking and surfacing in deep abyss. When each element retreats to its proper position, equilibrium is maintained.

Specifically, while gold generates water, it simultaneously hides within water. Black lead undergoes transformation to dwell in the western direction, forming the "White Tiger metallic embryo" (an alchemical term denoting a specific state). Mercury contains gold yet remains concealed within gold's womb. During alchemical practice, true mercury (purified quicksilver) is activated by external "talismanic fire" (symbolic temperature control), floating and sinking intermittently within its maternal matrix, appearing now present, now absent. When the fire regulation reaches perfect timing, these substances maintain their respective boundaries without chaotic movement.

The text concludes with the alchemical process described as "gathering what appears white, refining it into crimson." The collected material appears white, yet transforms red during refinement. Outwardly ordinary, it contains true essence within. These descriptions capture the wondrous transformations in alchemical processes. Through such accounts, Wei Boyang (Master Wei) reveals the ineffable subtleties of alchemical transformation—a manifestation of truly sacred mystery.

This scripture elucidates the core principles and practical methods of Daoist alchemy. It begins by describing the fundamental materials: "white gold" (a specialized alchemical term referring to specific metallic substances) appears white during kinetic transformations but turns red after high-temperature refinement. The alchemical process requires crafting this white gold into a "divine chamber" (shenshi, the alchemical vessel) - a one-inch round container symbolizing the undifferentiated chaos before creation. Divided into upper and lower halves that fit tightly together, this vessel houses true mercury (zhen gong, another alchemical substance) while maintaining perfect yin-yang equilibrium without leakage, thereby nurturing the "dragon and tiger" (longhu, representing yin and yang qi).

The text emphasizes that the true alchemical material, "true lead" (zhen qian, the essential substance), existed before heaven and earth took form, serving as the primordial source from which all creation emerged. Authentic alchemy must employ this pre-celestial, root substance as its foundation rather than ordinary post-celestial metals, minerals, or herbs. Without comprehending this principle of creation ex nihilo that generated heaven and earth, one cannot claim to practice true alchemical Dao.

The latter section details the laboratory setup: surrounded by walls and gate towers resembling the immortal Penglai mountains, with four-sided protection against external disturbances. Practitioners must maintain mental serenity during the process, allowing shen (spirit) and qi to permeate the entire chamber. Particular emphasis falls on guarding the alchemical furnace - success or failure hinges entirely on this vigilance, requiring constant energetic resonance between practitioner and furnace.

Collectively, this scripture reveals the central philosophy of Daoist neidan (internal alchemy) cultivation: through replicating the cosmic generative process within either the human body or alchemical furnace, practitioners recreate the mystery of yin-yang transformation and universal manifestation, ultimately refining the golden elixir (jindan).

The internal structure of the alchemical furnace is exquisitely designed, containing within it the Divine Chamber (the core space for elixir refinement) and the Golden Embryo (the nascent form of the elixir), with winding passages connecting them. Externally, the furnace is equipped with pivotal mechanisms, tightly sealed to prevent the intrusion of malign Qi and the leakage of true Qi. Only in this way can distracting thoughts be eliminated without excessive exertion.

Though the strict protection fills the furnace with divine energy, it is still necessary to regulate the interaction of Yin and Yang Qi. The key lies in continuously maintaining the firing process (control of the alchemical fire) to retain and transform the true Jing (essence). If the firing process is mishandled, even the presence of true Jing within the furnace will scatter. Only by precisely balancing the interplay of water and fire (Yin-Yang) with unwavering persistence can success be achieved. Thus, the movement of true Qi follows patterns that correspond to the rhythms of the human body.

(Chapter 27: Analysis of Erroneous Cultivation Methods)

These mistaken cultivation practices include: excessive inner visualization leading to a proliferation of distracting thoughts, rigid imitation of star-stepping techniques, or fixation on auspicious days like the Six Jia for practice. Some suppress Yang Qi through sinister methods, allowing turbid Qi to recklessly agitate the Dantian (energy center), inhaling external pathogens during breathing exercises, and depriving themselves of sleep day and night. The result is a body growing increasingly weak, a spirit dazed as if intoxicated, and meridians in chaos like boiling water.

Others build earthen altars for ceaseless sacrifices, summoning ghosts and spirits to manifest, then preening themselves over dream visitations, imagining they can prolong life—unaware they are hastening their demise. Such acts defy the natural order, straying far from the true path of the Yellow Emperor and Laozi, and contradicting the laws of the Nine Heavens' immortal realms.

The venerable Wei Boyang pointed out: People, ignorant of the Dao's fundamental principles, stray into heretical paths. Examples include the rudimentary practices of star-stepping (ritual pacing), choosing auspicious days for cultivation, or techniques like sexual alchemy and breath retention. These methods disrupt Qi circulation, damage the Shen (spirit), drive the Yang spirit from the body, and allow Yin pathogens to corrode the organs. The Seven Po (turbid Yin energies within the body) wander like restless corpses, the Three Corpses (malevolent energies in the body) wreak havoc in the eyes, meridians reverse, and the Dantian collapses. Seeking longevity, they instead harm their vitality—how could such practices lead to purity?

Still others erect altars to worship licentious spirits, deluding themselves into encounters with immortals, only to attract ghostly possession. Hoping to extend life, they accelerate death, their corpses left to rot in the wilderness. Such defiance of heavenly principles diverges from the orthodox path of Huang-Lao by countless measures. The warnings of past generations are plentiful—let them serve as stern admonitions.

This scripture primarily discusses how cultivation must follow orthodox methods, avoiding deviant paths. It points out that some practitioners experience chaotic Jing (essence) and Qi (vital energy) within their bodies, accompanied by illusory visions and dreams, mistakenly believing these phenomena indicate immortality. In truth, such practices violate natural laws. Wei Boyang (Master Wei) warns against these heterodox methods, urging practitioners to follow the true path directly.

The genuine way to longevity lies in ingesting the "Golden Liquor Returned Elixir" (Jinye Huandan), the supreme alchemical medicine in Daoist Neidan (internal alchemy). After consumption, it reverses aging—turning white hair black, restoring old men to youthful vigor, transforming elderly women into maidens, ultimately enabling one to become a "Perfected Being" (Zhenren, an enlightened immortal). The Yellow Court Scripture (Huangting Jing) similarly mentions that refining the "Nine-Cycle Eight-Jewel Elixir" (Jiuzhuan Baqiong Dan), a high-grade elixir requiring multiple refinements while absorbing the essence of sun and moon, can delay aging. This represents the supreme method for daylight ascension and deathless longevity.

Chapter 28 further clarifies that those who comprehend these principles must cultivate diligently without ceasing day or night. After three years of elixir ingestion, one becomes impervious to water and fire, moving freely without obstruction. Upon achieving success in cultivation, one must accumulate hidden virtue (Yin De) while awaiting the destined moment. When the time comes, the Great Unity Deity (Taiyi, one of Daoism's principal deities) will summon the practitioner to Central Continent (Zhongzhou, the abode of immortals), where they will finally be inscribed in the celestial registers and ascend as an immortal. The text specially emphasizes that Taiyi governs alchemical processes, and Central Continent signifies the Divine Land (Shenzhou, i.e., China). Cultivators must first accumulate merit in the human realm to qualify for immortal ascension.

Chapter 29 explains the method of fire regulation during the alchemical process, using the hexagrams of the Yijing (Book of Changes) as metaphors for the variations in alchemical fire control. The crescent moon (referring to the half-moon-shaped alchemical furnace) resembles the cauldron, with the White Tiger (representing lead) as the crucial element in refinement. Mercury flows like pearls, while the Azure Dragon (symbolizing mercury) complements it. The union of the East (Azure Dragon) and West (White Tiger) mirrors the mutual attraction of hun (ethereal soul) and po (corporeal soul).

The first quarter moon (7th–8th day of the lunar month) corresponds to the number eight of the Dui hexagram, while the last quarter moon (22nd–23rd day) aligns with the number eight of the Gen hexagram. Combined, these two eights make sixteen, equivalent to one jin (a traditional weight unit, historically 16 liang). This resonates with the 384 lines of the Yijing hexagrams, illustrating that fire regulation must be as precise as the transformations of the hexagram lines. In alchemy, one must follow the patterns of the Yijing, observing the waxing and waning of Yin and Yang (Pi and Tai). The cauldron takes the shape of an upturned moon, with the Golden Tiger (lead) inside serving as the pivot for the elixir’s circulation. Cinnabar mercury (red mercury) and the Azure Dragon (mercury), under the influence of the Bing-Ding fire (southern fire), are propelled by the Vermilion Bird (fire) into the golden embryo (the alchemical product).

The hun and po here refer to the hun of the Eastern Azure Dragon and the po of the Western White Tiger. The first and last quarter moons each span eight days, totaling sixteen days—matching the weight of one jin, which divides into 384 zhu (an ancient weight unit). This corresponds to the monthly cycle where Yin and Yang are balanced. Thus, the forms of Qian (Heaven, Yang) and Kun (Earth, Yin) are established, aligning with the celestial movements.

Chapter 30 describes the transformation of metal in intense fire. When true gold is cast into fierce flames, its color and radiance remain undiminished. Just as the sun and moon have shone brightly since the dawn of creation, true gold never loses its weight. The forms of the sun and moon are eternal, while gold’s essence originates from the moon, receiving solar energy at the new moon. Gold ultimately returns to its source—by the month’s end, it becomes enveloped in sunlight, its contours hidden as it sinks into emptiness. At this stage, gold regains its innate nature, glowing brilliantly within the cauldron.

In the mutual conquest of the Five Phases, fire overcomes metal, yet metal tempered by fire becomes refined, with neither suffering harm. Thus, the golden embryo in the cauldron does not dissipate but grows more luminous. Since the establishment of the Qian-Kun cauldron, the essences of the sun and moon continuously enter it, each enhancing the other’s purity. Gold’s weight remains unchanged, just as the sun and moon eternally revolve and shine. The claim that gold originates from the moon stems from gold being the essence of Yin, positioned in the West (where metal resides in the Five Phases). At each new moon, the moon absorbs solar energy, giving rise to gold. Gold’s return to its "mother" refers to its reversion to water (metal generates water) as the moon cycles. By month’s end, when Yang energy is exhausted, gold and water merge, their forms concealed as they descend into emptiness. The month’s end symbolizes the year’s close, while the new moon signifies renewal—gold and water solidify into enduring forms within the alchemical chamber.

This passage elucidates the principles of mutual generation and restraint between Yin-Yang and the Five Phases in alchemical practice. The numerical value of Zi (Water) is one, while Wu (Fire) is two—their combination makes three. The numerical value of Wu-Ji (Earth) is five. When three and five combine, they form eight, which explains the phrase "When three and five achieve harmony, the eight minerals establish cosmic order."

In alchemical practice, the Azure Dragon (Wood) and White Tiger (Metal) resonate with each other, their breath harmonizing like the union of husband and wife. The Yellow Earth serves as the father of Metal, while Flowing Pearl (mercury) acts as the mother of Water. Earth controls mercury, preventing its dissipation. The Vermilion Bird (Fire) must be properly regulated—if Water becomes excessive, Fire will extinguish, just as the lunar phases ultimately return to Earth's virtue. The three natures of Metal, Fire and Water unite, all originating from the same fundamental source.

The text then describes the miraculous effects of consuming the elixir. Even ordinary foods like sesame seeds (Jusheng) can prolong life when consumed—how much more potent must be the Golden Liquor Reverted Elixir of immortality. The true Golden Elixir never decays because it embodies the primordial Qi of heaven and earth. As the Dao De Jing states, "The nameless is the beginning of heaven and earth"—the Golden Elixir manifests this primordial energy.

After ingesting the elixir, the golden cinnabar permeates the five viscera and six bowels, spreading through the body like wind and rain. It rejuvenates one's complexion, turns white hair black, makes lost teeth regrow, restores old men to youthful vigor, and transforms elderly women into maidens. Thus liberated from worldly suffering, one becomes a perfected being (Zhenren).

This passage elucidates the fundamental principles of alchemy and natural laws. It begins by stating that all phenomena in heaven and earth evolve from the primordial "One Qi," and that true gold (referring to the metallic essence used in alchemy) functions like a mother producing golden sand, which can be refined into the Reverted Elixir (the immortality elixir). The earth element, permeating the transformations of the four seasons, remains the constant key throughout the alchemical process. Wei Boyang (Master Wei) reveals that ingesting this elixir produces miraculous effects unlike ordinary medicines—its potency swiftly circulates through the body, restoring youth, turning white hair black, regenerating teeth, and granting longevity.

Chapter 33 employs several analogies to demonstrate that alchemy must follow natural laws: when heated, lead powder (ceruse) reverts to lead; snow melts into water when warmed; and golden sand shares the same essence as mercury. To concoct the elixir of immortality, one must use materials of identical nature—just as millet seeds produce millet and chicken eggs hatch chicks. Different species cannot transform into one another—swallows don't give birth to phoenixes, nor do foxes produce horses. Water flows downward while fire rises upward—these are immutable natural patterns.

Chapter 34 emphasizes the principle of "like begets like" in alchemy. True gold, as the foundational medicine, generates the golden sand and mercury essential for refinement. This mirrors how crops grow from seeds and chicks emerge from eggs—the way of nature. Mistakenly using incompatible materials like metals, herbs, or dew leads to alchemical failure. Water's moistening descent and fire's flaming ascent each follow their intrinsic natures; only by adhering to these natural laws can one successfully refine the elixir of immortality.

The conclusion observes that while many seek the Dao, few truly comprehend these natural principles—implying that successful cultivation and alchemy require correct understanding and alignment with these fundamental truths.

Many learned scholars in the world, though exceptionally talented, waste their energy and resources in vain due to lacking proper guidance from enlightened masters. They rigidly follow texts and practice randomly based on imagination. Some blindly experiment with minerals like qiangshidan (a mineral compound), mica, arsenic ore, magnetite, and sulfur, mixing them with Yuzhang (modern Jiangxi) clay for refining, even adding wushitong (a five-mineral copper alloy) as supplementary material. Unaware that these conflicting substances are fundamentally incompatible, they inevitably fail after countless attempts—what they consider cleverness only reveals foolishness. Such wishful thinking ultimately bears no fruit, for only sages comprehend the true principles. Many devote their lives to seeking the Dao from youth until white-haired old age, only to grow doubtful midway and stray from the proper path into error. It's like viewing the sky through a bamboo tube—such narrow vision naturally prevents foreseeing the future.

The Zhenren (Perfected) Wei Boyang points out that although these scholars are devoted to cultivating the Dao, lacking proper guidance leads them to merely parrot texts, squandering wealth on concocting various elixirs in vain hopes of immortality. Obsessed till death, they resemble those trying to glimpse a leopard through a tube—doomed to repeated failures as they stray into misguided paths. The principle of incompatible substances has already been explained in prior commentary.

Chapter 35 describes the model of supreme sages: The greatest sage is Fuxi, who first drew the Bagua (Eight Trigrams) to emulate heaven and earth; King Wen of Zhou, as the exemplary ruler, expounded the principles of change through hexagram statements; Confucius, the pinnacle of sages, supplemented with the Ten Wings for interpretation. These three heaven-endowed sages emerged successively—though their eras and achievements differed, their merits were equally profound. Their classic works form an unbroken lineage, capable of precisely calculating the measures of all creation. While tangible things are easily assessed, intangible signs defy prediction. The sages' legacies—the Book of Changes, Book of Songs, and Book of Documents—became eternal models.

Wei Boyang praises these three sages for their extraordinary gifts, each manifesting wisdom uniquely: Fuxi deduced the Dao of Change to comprehend the principles of all existence; King Wen revealed fortune and misfortune through hexagrams; Confucius edited the classics to establish moral order. They could calculate celestial movements and deduce cosmic transformations. Even vast as heaven and earth, none escape the laws of rise and fall; seemingly formless Yin-Yang contains immutable patterns of motion. Thus, sages emulate these patterns—using Qian (Heaven) and Kun (Earth) to symbolize the alchemical cauldron, letting the dual Qi (vital energies) govern all spirits, mastering time through gnomon shadows, and circulating true Qi through the liuxu (six directions—up, down, and four cardinal points).

(Note: "Liuxu" refers to the six spatial directions, symbolizing the celestial orbit of Qi circulation in alchemical practice; "embracing the One Qi" denotes the core technique of concentrating spirit and gathering Qi during cultivation.)

Between heaven and earth, all things are nurtured. While tangible forms are easily comprehensible, the formless transformations of Yin-Yang remain elusive. Were it not for the three sages—Fu Xi, King Wen, and Confucius—who elucidated the Dao through the Book of Changes (Yijing), how could people grasp the profound mystery of "water and fire complementing each other" (referring to the harmony of Yin-Yang)? Without the guidance of scriptures left by sages throughout the ages, where would practitioners find the methods to harness the "dragon and tiger" (symbolizing the Yin and Yang energies within the body)?

Thus, ordinary people inherently lack the ability to foresee the future, but through studying the classics, enlightenment can be attained. It is like lifting a curtain to see clearly or ascending a high platform to gaze into the distance. The wisdom of the sages may seem lofty, yet it can be comprehended through the Yijing. What follows is a brief explanation of the contents of the Fire Record (Huojì).

The Fire Record comprises six hundred chapters. Though voluminous, its core teachings are consistent. These texts solemnly expound the essentials of cultivation, yet regrettably, people often fail to ponder their origins deeply. Yin and Yang are two aspects of a single unity. Here, I venture to explain for those with the affinity to understand—how could I dare to write recklessly? To remain silent would risk the Dao being lost, yet to put it into writing might divulge celestial secrets. After much hesitation, I can only sigh and decide to outline the essentials, leaving the finer details to be transmitted orally.

The so-called six hundred chapters are actually derived from calculations based on the celestial movements of the heavens, representing the total number of "fire phases" (referring to the control of heat during alchemical processes). Morning and evening each correspond to a hexagram, and the sequence of the six hundred chapters strictly follows the laws of heaven and earth. Thus, the principles governing the cycles of years, months, days, and hours are interconnected. Wei Boyang (author of the Zhouyi Cantongqi) neither dared to remain silent and obscure the Dao nor to reveal all its secrets outright. He could only summarize the key points, leaving the subtler aspects to be passed down through oral instruction between master and disciple.

Using "metal" (referring to lead) as a dike, "water" (referring to mercury) can flow peacefully. The measure of metal is fifteen parts, and water is taken in equal proportion. Before the crucible, precise measurements are essential, with water slightly exceeding by five parts. Two portions serve as "true gold" (the essence of the elixir), their weight maintained in their original state. The third portion is not directly exposed to fire but interacts with the first two. The fusion of these three substances produces wondrous transformations. Below, pure Yang Qi (vital energy) rises, first liquefying and then solidifying, forming what is called the "Yellow Chariot." If the process is mishandled and the elixir is ruined, not only is all effort wasted, but the practitioner's lifespan may also be harmed, leaving behind only ashes as residue.

The "Golden Mother" (referring to lead) resides at the center of the alchemical cauldron, acting like a dam to regulate the flow of mercury, harmonizing metal and water. As time passes, metal and water each absorb the essence of heaven and earth, ultimately merging into a perfect unity.

This passage explains the key procedures and principles of ancient alchemical practices. It first mentions that the "golden sand mother" (the fundamental material in alchemy) does not diminish during the refining process, being as precious as gold itself. The "true earth" (a special soil used in alchemy) remains inert in reactions, while the three elements of metal, fire, and wood enter the alchemical vessel through the interaction of water and fire. These three properties intermingle, producing marvelous transformations.

The alchemical materials initially absorb solar essence to form a liquid state, which then condenses into "yellow chariot" (an alchemical term referring to the preliminary refined substance). Through the cyclical movements of the heavens and the interactions of Yin-Yang and the Five Phases (Wood, Fire, Earth, Metal, Water), the substance ultimately returns to the "central palace" (the heart of the alchemical furnace), embodying the Yellow Emperor's virtue of earth. When the alchemical process succeeds, the material becomes as subtle and translucent as dust particles seen through a window.

Chapter 38 details specific alchemical operations: the materials must be ground, mixed, and placed in the "vermilion gate" (a specific section of the furnace), then tightly sealed. The heating process below requires continuous fire day and night—beginning with gentle heat (wenhuo) and concluding with intense heat (wuhuo). One must carefully observe temperature changes throughout twelve seasonal cycles. When the Qi approaches exhaustion, the material turns purple, ultimately transforming into the "returned elixir" (the most precious alchemical product). Consuming just a minuscule amount (daogui, an ancient unit of measurement) yields miraculous effects.

Chapter 39 explains the operating principles of the Five Phases: water overcomes fire just as the moon obscures the sun's radiance. The mutual provocation of water and fire typically occurs during the new moon (huishuo). When water's power peaks, it suppresses yang energy; when fire weakens, daylight dims. This mutual waxing and waning of Yin-Yang follows natural law. The Five Phases are ultimately manifestations of formless Qi, difficult to name or define, yet through comprehending the overarching patterns of heaven and earth's movements, one can master their application in the alchemical cauldron. When Yin and Yang unite—as fire ascends while water recedes, and water's stimulation causes fire's decline—the "solar soul" (yang energy) begins to manifest.

This passage elucidates the principle of Yin-Yang mutual generation in alchemical practice. The moon transitions from its lunar essence (Yin) at the new moon (first day) to the interplay of masculine and feminine (Yin-Yang) by month's end, mirroring how cinnabar (Yang) and mercury (Yin) mutually generate each other in alchemy. This reflects the natural order of heaven and earth, through which the Dao of alchemy becomes clearly manifest.

Chapter 40 discusses the function of "naming": names serve to determine the essence of things, while written characters express inherent nature. When metal (representing emotionality) returns to its original nature, it becomes what we call the "Reverted Elixir" (Huan Dan, the medicine of returning to origin). The author dares not speak presumptuously, merely following the writings of ancient sages. The text references the Dragon-Tiger Classic (Longhu Jing), the Yellow Emperor's refinement of golden splendor (Golden Elixir), Prince Huainan's preparation of autumn stone (alchemical substance), and Wang Yang's addition of yellow sprout (alchemical ingredient) - all exemplars who persevered in cultivation, unlike the unworthy who could never attain such heights. The path of cultivation remains constant across ages.

Metal represents emotionality, while water represents essential nature. Metal can generate mercury (emotionality returning to nature), yet metal itself is born from water (water as metal's mother), while water in turn originates from metal (metal as water's mother) - hence the term "Reverted Elixir." This reflects the aforementioned relationship where "the mother hides in the child's womb, the child dwells in the mother's belly." The author Wei Boyang (Master Wei) speaks no falsehood, employing the hexagrams of the Book of Changes (Yijing) and the ancient Dragon-Tiger Classic to expound his teachings. He praises the Yellow Emperor, Prince Huainan, Wang Yang and other sages who maintained steadfast practice. The Dao of cultivation springs from the same source throughout history, unattainable by the unworthy, hence his admonition for later generations to contemplate earnestly. These essential principles have been clearly explained - they are true and without deception.