《周易參同契發揮》Vol. 5

The fifth section of Volume Five in The Elucidation of the Zhouyi Cantongqi was composed by the Southern Song Daoist Yu Yan (styled Quanyangzi). This portion primarily explores the relationship between human respiration and the Yin-Yang of heaven and earth, as well as the core principles of Neidan (internal alchemy) cultivation.

The reason humans can breathe, as Zhang Zai (Hengqu) stated in Correcting Youthful Ignorance, is a manifestation of the interaction between the Yin and Yang of heaven and earth. What is called "breath" (xi) refers to the process of one inhalation and one exhalation. With each exhalation, the pulse beats twice, and the Qi (vital energy) travels three inches; with each inhalation, the pulse similarly beats twice, and the Qi travels another three inches. Thus, in one complete cycle of breathing (fixed breath), the Qi moves a total of six inches. Over the course of a day and night (measured in one hundred ke), a person breathes 13,500 times, with the Qi traveling 810 zhang (approximately 2,700 meters), circulating ceaselessly within the body.

While in the womb, a person relies on the mother’s breath for survival, possessing neither sight nor hearing, maintaining only the most basic respiratory function. After birth, when the umbilical cord is severed, the innate primordial Qi (zhenyuan zhi qi) gathers in the Dantian (energy center) below the navel. As one grows, the mind and Shen (spirit) scatter outward, and the primordial Qi gradually dissipates, no longer preserving the pure breathing state of the womb.

The method of cultivation practiced by immortals is to guide individuals, through inner contemplation and breath regulation (taihe), to return to the original state of life’s source. Xu Xun (Xu Jingyang) mentioned in The Song of Drunken Immortal Thoughts that by circulating the internal true Qi and natural breathing, one can reverse aging and rejuvenate. The Song of the Great Dao of the Numinous Source also points out that the true essence of cultivation lies in mastering "true breath" (innate respiration) rather than pursuing various arcane theories.

What Wei Boyang (Lord Wei) refers to as "the firmness of Qian (Heaven) and the softness of Kun (Earth) embracing each other" describes the process of Neidan cultivation, where the Yang-representing Qian (Heaven) and the Yin-representing Kun (Earth) must intermingle, allowing the breath to contain both Yin and Yang, firmness and softness in harmony. Like the union of husband and wife, Shen (spirit) and Qi, as well as nature (xing) and life (ming), are merged into one, thereby gestating the Golden Elixir (jindan) within the body. This process has many metaphorical descriptions: the coupling of dragon and tiger (the union of water and fire), the merging of metal and wood (the harmony of Yin and Yang), the entwining of turtle and snake (the interweaving of Yin and Yang), the meeting of red and black (the fusion of blood and Qi), etc.—all are different expressions depicting the perfect fusion of Yin and Yang Qi within the body.

This passage elucidates the core principle of Yin-Yang interaction in Daoist Neidan (internal alchemy) practice. The text employs multiple metaphors to illustrate this truth: just as female and male complement each other, as hun and po souls merge, or as water and earth share common origins, the essence of cultivation lies in making the Shen (spirit, Yang aspect) and Qi (vital energy, Yin aspect) interdependent, achieving their fusion through internal Yin-Yang resonance.

Specifically, "Yang bestows while Yin receives" resembles morning dew condensing on flower buds, gradually permeating as the blossom unfolds. "Male and female mutually depend" parallels the cooperation between the Azure Dragon of the East (Jia Wood) and White Tiger of the West (Geng Metal), akin to lead and mercury (fundamental alchemical substances) blending within the crucible. This principle of Yin-Yang union mirrors how heaven and earth generate all things through their interaction.

The text cites several alchemical classics to substantiate this view:

• The Jade Mushroom Scripture states that without the intercourse of heaven (mysterious) and earth (yellow), how could Yang energy arise from the Kan trigram (Water element)?
• The Great Dao Song of Yuanyangzi uses "heaven coupling with earth, entering the bridal chamber" as metaphor for Yin-Yang union
• The Awakening to Reality describes the Red Dragon (heart fire) and Black Tiger (kidney water) meeting in the central palace (Wu-Ji)
• The Treatise on Returning to Life reveals the supreme Dao principle as transferring the sun (Yang) into the moon (Yin)

These all demonstrate that only through Yin-Yang coupling can the "alchemical agent" (energetic foundation of Neidan) be produced, eventually forming the "sacred embryo" (advanced attainment). However, to truly achieve the perfected elixir (highest accomplishment), one must master the secret of fire regulation. Understanding coupling principles without fire control can at most warm the lower Dantian (basic practice), never yielding the genuine Golden Elixir.

A final ancient verse clarifies the cultivation sequence: "Red entering black" (Yang entering Yin) constitutes foundational work, while "black entering red" (Yang born from Yin) leads to celestial immortality. This implies Neidan practice must distinguish between primordial (pre-heaven) and conditioned (post-heaven) levels of attainment.

This scripture primarily discusses the distinction between "pre-heaven" (xiantian) and "post-heaven" (houtian) in Daoist Neidan (internal alchemy) practice, as well as how to cultivate the Golden Elixir by harmonizing Yin-Yang and aligning with natural rhythms.

The practice is divided into two phases: In the pre-heaven stage, one should quietly guard the Dantian (energy center below the navel) through Wuwei (non-action); in the post-heaven stage, the focus shifts to actively directing intention to the Baihui point (the crown of the head). These two approaches should not be confused.

The key to cultivation lies in seizing the moment when heaven and earth's Yin and Yang energies unite. The body's internal Yin-Yang transformations correspond with natural cycles. By calming the mind and synchronizing one's Qi (vital energy) with the cosmic breath, one may comprehend creation's mysteries. The Tianyinzi states that achieving just a few such synchronizations within a year brings bodily refreshment, while sustained practice leads to immortal realms.

The text's reference to "Kan-Li" symbolizes the moon and sun's Yin-Yang duality. Neidan practice recognizes two types of celestial cycles: internal (the rhythm of breathing) and external (cosmic energies of sun, moon and stars), which mutually reinforce each other. The Huangting Jing (Yellow Court Classic) teaches that practitioners should facilitate the intermingling of internal and external Yin-Yang. Over time, this produces refined substances within the body (true pearls and jade) - just as clams transform lunar-solar essences into pearls, or stones accumulate energy to become jade.

As the Shangqing Ji summarizes, the fundamental principle of cosmic operation is simply the harmonization of Yin-Yang (Kan-Li). Like uncut jade hidden within stone, every human body contains the latent potential for immortal transformation through cultivation.

The pearl hidden within the oyster shell reveals the profound mystery of the heavenly Dao. Truth is right before our eyes, yet many seekers fail to comprehend it precisely because the Dao is so near to us—just as the eye cannot see its own lashes, foolish people often brush past truth without recognizing it.

Xuanming (referring to the cosmic origin) is profoundly mysterious and cannot be depicted through images. Ancient sages, through deep contemplation, grasped the fundamental principles of refining the Golden Elixir (the core concept of Neidan). The Golden Elixir texts mention a mysterious existence called "Xuanming," from which the Golden Elixir originates. It is silent, empty, and unfathomable—utterly impossible to illustrate. Since it cannot be drawn, one can only perceive it with the heart. Yet personal realization alone is insufficient; to transmit this understanding to others, one must resort to metaphors and words, allowing them to silently grasp its mystery. Thus, the sages explored profound truths, using various analogies to explain the ultimate profundity of the primordial Dao, detailing the fundamental principles of Golden Elixir cultivation. This is why texts like the Cantongqi employ the principles of the Yijing to elucidate the Dao of the Elixir.

The "Primordial Foundation" is the root of cultivation. The Wuzhen Pian states: To make the "Valley Spirit" (original spirit) immortal, one must rely on the "Mysterious Feminine" (the meeting point of Yin and Yang) to establish this foundation. The subjugation of lead and mercury (Neidan terms referring to the body's essence, qi, and spirit) entirely depends on the function of the Mysterious Feminine. Thus, the Mysterious Feminine is the foundation for refining the Returned Elixir. When men cultivate the Mysterious Feminine, their essence and qi become stable; when women cultivate it, menstruation ceases. If practitioners fail to understand this principle, from where will the "medicinal ingredients" (Neidan terms for the essence, qi, and spirit required for cultivation) come? How can the Returned Elixir (the highest achievement in Neidan practice) coalesce? And how can the "firing process" (the regulation of intention during cultivation) be properly controlled?

The "Four Elements" refer to Qian, Kun, Kan, and Li (the four trigrams from the Yijing, symbolizing heaven, earth, water, and fire). When they merge into one, it is called "Chaos." The Zhixuan Pian says: The subtle and continuous breath naturally gathers from all directions—this is the state where Qian, Kun, Kan, and Li unite as one. When they become one, spirit and qi return to their root, directly entering a realm of formless emptiness, profound and ineffable. The Lingyuan Dadao Ge states: After merging into one, forget even this "one," and you may roam with the transformative power of creation. However, the "emptiness" spoken of in the Dao of the Elixir does not refer to a state of mind like dead ashes, utterly devoid of thought. The Wenzi Tongxuan Zhenjing says: In what seems like darkness, one can see; in silence, one can hear; in deep obscurity, there is unique awakening; in absolute stillness, there is singular illumination.

This passage discusses the profound and ineffable realms encountered in spiritual cultivation. Some practitioners fail to comprehend these states and mistakenly equate them with the quiescent extinction of Chan Buddhism. If the Golden Elixir path (Daoist Neidan practice) were identical to Chan teachings, one might as well study Chan directly—why bother with the intricate principles of Qian-Kun-Kan-Li (the four hexagrams from the Yijing symbolizing heaven, earth, water, and fire)? Why must one thoroughly understand the transformations of Yin-Yang and probe the mysteries of creation to attain the Dao?

The method of refining the Golden Elixir uses Qian (heaven) and Kun (earth) as the alchemical cauldron, Kan (water) and Li (fire) as the medicinal ingredients, while the remaining sixty hexagrams—from Zhun and Meng to Jiji and Weiji—are arranged around the cauldron, symbolizing the celestial cycles of fire phases (the rhythmic energy circulation in Neidan practice). Like an emperor’s chariot procession, these sixty hexagrams form the unfolding carriage, and the dragon-horse (symbolizing the primordial spirit, Shen) is naturally guided. The Shangqing Yuzhen Taixi Jue states: "Take consciousness as the chariot and breath as the horse; driving them all day will not cause fatigue." This state of "non-fatigue" mirrors the Dao De Jing’s description: "continuous yet imperceptible, used without exertion." "Without exertion" here means neither complete neglect nor forced control, but a natural state of effortless awareness—neither clinging nor abandoning.

The ancient immortal Guangchengzi once instructed the Yellow Emperor: "I guard the primordial Qi (vital energy) and maintain harmony; thus, after cultivating my body for twelve hundred years, it has never aged." The human body resembles a kingdom, with the heart as its sovereign. When the heart is tranquil, the spirit gathers, the breath harmonizes, and the three Dantian (upper, middle, and lower energy centers) naturally rise and descend, ensuring the smooth flow of meridians. Persisting in this practice inevitably leads to immortality. The Gu Shenzi Liaoran Lun explains: "The path of self-cultivation takes the supreme primordial spirit as its foundation, the purest essence (Jing) as its medicine, serene equanimity as its function, and Wuwei (non-action) as its principle. Wuwei consolidates the spirit; a consolidated spirit accumulates harmonious Qi; accumulated harmonious Qi stabilizes the foundation; a stabilized foundation achieves the Dao of enduring life." Any deviation from this method cannot be considered true Golden Liquor Reverted Elixir (the highest form of Neidan) practice.

In truth, the circulation of Qi and blood in the body thrives when undisturbed. The method of cultivation is remarkably simple: embrace the primordial and guard the One (preserving the innate state), concentrate the breath to attain softness (gathering Qi into pliancy), and return to the naturalness of an infant. Thus, in alchemical practice, no elaborate techniques are needed—only empty the mind in stillness, focus the spirit at the Qi cavity (Dantian), and follow the natural rhythms.

During cultivation, the breath should flow continuously without interruption. With persistent practice, the spirit (Shen) will naturally concentrate and the breathing will naturally stabilize. When breathing becomes steady, primordial Qi will gather, and this gathered Qi can form the Neidan (internal elixir, core energy body of Daoist practice). At this stage, one no longer needs laborious techniques like deliberate massage, Daoyin (guiding and pulling exercises), breathing methods, or visualization.

The secret of internal cultivation states: when the sun rises, move with it; when the moon appears, settle into stillness. Let the breath follow the natural rhythms of entering and exiting, never straying far from the Dantian (lower abdominal energy center). Ultimately, the foundation of refining the Golden Elixir (Jindan) lies in harmonizing the primordial Qi (Yuanqi)—there is no other method beyond this.

Just as a wise ruler, while residing deep in the palace, need only issue benevolent decrees for distant lands to respond, so too does the cultivator, by maintaining inner stillness and reaching a state of profound emptiness, naturally attract the Qi of heaven and earth. This is the natural principle of "where there is resonance, there is response." The ancient sage-kings commanded their ministers to spread virtuous governance in spring and their generals to prepare military defenses in autumn—all in accordance with the rhythms of Yin-Yang. If this is the way of governing a state, how much more so the way of refining the elixir?

The key to cultivation lies in seizing the right moment. As the Huanjin Pian (Returning Gold Treatise) states: "Do not miss the proper hour; guard the critical moment when Yang Qi first arises." To refine the elixir, one must first understand the timing and then wait patiently. Before the moment arrives, remain in stillness—as Xu Jingyang (a renowned Eastern Jin dynasty Daoist) advised, "Gather the heart and halt thoughts, awaiting the congealing of essence (Jing) and Qi," or as the Xuan Sanshi Jiu Zhang (Thirty-Nine Chapters of Mystery) instructs, "Close the mouth, lower the eyelids, and quietly observe." When the time comes, without deliberate striving, the Yin and Yang within will naturally merge and solidify. Just as the sun follows the ecliptic in its natural course, forcing the process will only bring harm.

Specific timings correspond to hexagrams:

• Zhun (屯, "Sprouting") corresponds to the hours of Zi (23:00–1:00) and Shen (15:00–17:00).
• Meng (蒙, "Youthful Folly") corresponds to the hours of Yin (3:00–5:00) and Xu (19:00–21:00).

Each of the sixty hexagrams has its corresponding hour, but here we list only two as examples. Zhun’s lower trigram is Zhen (Thunder), with its first Yang line (初九) corresponding to Gengzi (a specific heavenly stem and earthly branch hour), while its upper trigram Kan (Water) has its fourth Yin line (六四) corresponding to Wushen (another stem-branch hour).

This passage explains how the heavenly stems and earthly branches (such as Yin and Xu) correspond to the first six-line hexagram (Wuyin) of Kan and the fourth six-line hexagram (Bingxu) of Gen. In fact, the hours of Zi, Shen, Yin, and Xu correspond to the four cardinal hours (Zi, Wu, Mao, You), symbolizing the four seasons of spring, summer, autumn, and winter, the four phases of Wood, Fire, Metal, and Water, and the four symbolic animals—turtle, snake, dragon, and tiger. These are all metaphorical expressions.

From the perspective of the sixty hexagrams as a whole, beginning with Zhun and Meng and ending with Jiji and Weiji, the yin and yang lines intertwine throughout. Though each hexagram appears distinct, there are correspondences between reversed hexagrams (e.g., Zhun and Meng are inverses of each other) and opposing hexagrams (e.g., Zhun and Ding are counterparts). In essence, all hexagrams share the same underlying principle. The Daoist master Wei Boyang states, "I briefly present these two images, unable to exhaust their meaning," urging practitioners to focus on the hexagrams of Zhun and Meng. By grasping these two, one can infer the deeper truths of all other hexagrams.

Each of the sixty-four hexagrams has six lines, so two hexagrams together make twelve lines, corresponding to the twelve hours of a day. The sixty hexagrams total 360 lines, matching the 360 hours of a lunar month. Wei Boyang’s original intent was merely to borrow these hexagram images to illustrate the yin-yang transformations in the body’s internal alchemy (Neidan), particularly the regulation of "fire times" (the control of heat in refining the elixir). For example, Xu and Song correspond to the hours of Zi and Shen, Yin and Wu, while Shi and Bi align with Yin and Chou, Wei and Shen—and so on for the other hexagrams. Hence, he says, "I briefly present these two images."

The Wuzhen Pian states, "The origins of the northern and southern schools reverse the hexagram images; the fire times of dawn and dusk align with the celestial pivot," further clarifying this principle. If one clings to the literal surface of the text, obsessively calculating the numerical patterns of the hexagrams or forcing interpretations to fit the yin-yang lines, they may toil their whole life without achievement—exhausted yet finding no true path. Is this not lamentable?

As for "establishing punishment where righteousness lies, bestowing virtue where benevolence resides": The west represents righteousness (Metal), governing sternness and restraint, while the east embodies benevolence (Wood), governing growth and vitality. "Establishing punishment" refers to refining the lead (Jing, essence) of the west (Metal), while "bestowing virtue" refers to cultivating the mercury (vital fluid) of the east (Wood). Lead, associated with Metal, is firm and strong, hidden within the waters of Kan—requiring fierce fire (Wu Huo, martial fire) to sublimate it. Mercury, associated with Wood, is soft and yielding, hidden within the fire of Li—where it naturally stabilizes upon encountering true lead, requiring gentle fire (Wen Huo, civil fire) for nurturing. This is the essential method of fire regulation described in the Chongzheng Pian.

The passage elucidates the Daoist principle that Neidan (internal alchemy) practice—the core cultivation method in Daoism—requires unwavering focus and sincere devotion. Just as governing a city relies on civil virtue (De) while warfare demands military strategy, spiritual cultivation must discern proper timing and methods. Success comes through aligning with natural rhythms, while defiance invites failure.

Practitioners must strictly observe seasonal nodes and celestial hours (Daoism emphasizes cosmic resonance, believing specific times optimize Qi absorption), selecting moments as meticulously as harvesting divine mushrooms. Only with a mind purified of all distractions can one gather heaven-earth essences (Shenzhi). Even when retreating for a year in meditation chambers, circulating inner Qi (Lingqi) from dawn till dusk demands total immersion—only then can the Golden Elixir crystallize and the mortal form transcend.

Treating cultivation as frivolous play, casually revealing celestial secrets, or abandoning practice after brief attempts betrays insincerity. The Huangting Jing (Scripture of the Yellow Court) states that enlightenment never occurs by chance—it stems solely from single-minded devotion. History shows no practitioner achieved success without earnest commitment or divided attention. Consider the ancient Go master Yi Qiu’s students: one focused intently while the other fantasized about shooting swans—the latter failed. If even a trivial skill like Go requires concentration, how much more so the Dao?

Sima Chengzhen (Tang Dynasty Daoist master) wrote in Zuowang Lun (Treatise on Sitting-in-Forgetfulness) that only undisturbed leisure permits true cultivation. Practice demands serene Wuwei (non-action), free from external disturbances. Attempting cultivation while managing household chores or official duties fractures attention. Zhang Xujing (Song Dynasty adept) declared in Dadage (Song of the Great Dao): "With Shen guiding Qi, and Qi nourishing the body, longevity needs no convoluted methods." Though techniques are simple, true attainment is rare—even encountering the Dao, without wholehearted practice, scarcely one in millions succeeds.

Today, some fantasize about instant transcendence through casual dabbling. They misunderstand that momentary effort merely initiates elixir formation—years of fiery refinement follow. True adepts maintain cultivation states through all daily activities, ever vigilant against insufficient fire phases or weak elixir potency. How could they pause even briefly?

To truly grasp the changing patterns of time, one must observe the cyclical rhythms of growth and decline in nature. The Wuzhen Pian (Awakening to Perfection Scripture) states that all things between heaven and earth follow fixed cycles of flourishing and fading—only through careful observation of these transformations can one comprehend their profound mysteries. It further explains how the waxing and waning of the moon corresponds to the ebb and flow of Jing (essence) and Qi (vital energy) in the human body, while the rising and setting of the sun aligns with the alternating warmth and coolness of our blood and Qi. Just as the moon progresses through its monthly phases of darkness (end of cycle), new crescent, first quarter, and full moon, so too does each day follow the natural rhythm of dawn and dusk, daylight and nightfall.

The human body mirrors the movements of heaven and earth, with the rise and fall of Qi and blood perfectly synchronized with cosmic patterns. The Suwen (Basic Questions) records: At dawn, the body's Qi begins to stir; at noon, Yang energy reaches its peak; by evening, Yang weakens and the "Qi gates" close. It further notes how the new moon marks the beginning of blood and Qi replenishment, with defensive Qi (Weiqi) initiating its circulation. During the full moon, blood and Qi fill the muscles with strength, while the waning moon brings slackened muscles, empty meridians, and diminished defensive Qi—leaving only the physical form. Thus, as heaven and earth have their day-night cycles, so does the human body; as the moon progresses through phases, corresponding physiological cycles unfold. The alternating patterns of cold and heat, the metabolism of Yin and Yang—all correspond precisely with natural phenomena.

Therefore, the Neidan (internal alchemy) practice employs heaven as the cauldron and earth as the furnace, using lunar phases as the guide for gathering medicinal Qi—each collection timed according to the moon's waxing and waning. The sun's journey serves as the standard for fire regulation, with all activity and stillness synchronized to sunrise and sunset. Every step, from beginning to end, must harmonize with celestial rhythms. Just as the Huangji Jingshi Shu (Book of the Supreme Ultimate Ordering the World) compares the Yin hour (3–5 AM) to the solar term of Jingzhe (Awakening of Insects), symbolizing the first stirrings of life, and the Xu hour (7–9 PM) to Lidong (Beginning of Winter), representing the retreat of all things—are these not precisely the critical moments for fire regulation in alchemy? During the three nighttime hours of Hai, Zi, and Chou (9 PM–3 AM), when the sun lies below the horizon, time progresses yet Yang remains dormant. This is the subtle juncture where nascent Yang stirs while all things rest in potential—the very moment when sages perceive the core mechanics of cosmic movement.

All alchemical procedures—Choutian (fire regulation), Yunyong (Qi guidance), Muyu (nurturing warmth), and Jiaojie (Yin-Yang harmonization)—must emulate the creative transformations of heaven and earth. This constitutes the supreme path of cultivation. Any method that disregards natural laws in favor of artificial systems remains mere amateurish speculation—a trivial deviation from the true Dao.

This passage illustrates the relationship between human cultivation and celestial cycles through natural phenomena. The Huainanzi records how creatures like clams, crabs, and turtles experience growth cycles that wax and wane with the moon's phases—even the brains of fish expand and contract with the lunar cycle. If these humble creatures resonate with cosmic rhythms, how much more should humans, the most spiritual of beings?

This reveals the optimal timing for Neidan (internal alchemy, the Daoist practice for longevity). During full moons, when Qi and blood are most abundant, the "medicinal potency" peaks; after the moon wanes, this vital energy diminishes accordingly. The Cuixu Pian (a Daoist classic) states that the full moon night allows practitioners to gather celestial essences to form the spiritual elixir, but missing this golden window (the sixteenth day of the lunar month) makes the process as futile as chasing the Dragon and Tiger (symbolizing Yin-Yang).

Multiple alchemical texts emphasize the Mid-Autumn Festival's unique efficacy: The Wuzhen Pian notes the fifteenth day of the eighth lunar month, when moonlight shines brightest, marks the peak potency of "golden essence" (primordial Qi). The Chongzheng Pian describes this moonlit night as ideal for initiating practice, while the Jindan Dacheng Ji stresses the perfect Yin-Yang equilibrium for "gathering the medicinal herbs" (harvesting Qi). This doesn't imply cultivation is only possible during Mid-Autumn, but rather highlights the season's balanced day/night cycles, crisp autumn air, flourishing Metal Phase energy, and temperate climate—conditions ancient adepts favored for consolidating the inner elixir by absorbing heaven-earth essences.

The text critiques those lacking authentic transmission who mistakenly believe merely bathing in moonlight during Mid-Autumn grants enlightenment—a pursuit as vain as "netting the wind or tying shadows with rope." It concludes by citing Tang hermit Shi Jianwu's records, emphasizing that genuine practice requires prolonged retreats (300 days for major stillness, 200 for medium, 100 for minor), though he began experimenting with shorter sessions starting New Year's Day, 838 CE, during Emperor Wenzong's Kaicheng era.

This scripture elucidates the principles for cultivating Neidan (internal alchemy, the Daoist practice for achieving longevity). It first instructs practitioners to seclude themselves during the Gengshen day (a specific calendrical date), cutting off external contact to maintain 100 days of undisturbed meditation. Within a month, one may experience three distinct signs: divine light illuminating the eyes, hundreds of mystical sounds converging in the ears, and a refreshed spirit free from dullness. The simultaneous manifestation of these three phenomena confirms the veracity of immortal scriptures.

The same disciplined stillness is required for refining the Great Elixir (advanced Neidan). Only through sustained serenity can one achieve mental clarity and harmonious Qi flow, allowing the body’s internal "cauldron" (a metaphor for the human cultivation system) to become fully prepared. Those who indulge in worldly distractions, exhausting their bodies and depleting their Shen (spirit), yet fantasize about sudden success during the Mid-Autumn Festival (the 15th day of the eighth lunar month) will find it nearly impossible.

The text emphasizes the critical importance of "fire timing" (the regulation of intention and breath during practice). The true "fire" is not the artificially conjured flame of heart and kidneys but the body’s spontaneously arising genuine fire; the true "timing" is not mechanical clock-watching but the natural rhythm of Qi transformation. This fire flares when met with "wind" (gentle breath) and subsides when grounded by "earth" (steady intention). It must be neither excessive nor deficient—balanced like the subtle Xun wind (gentle exhalation) stirring it and the stabilizing Kun earth (focused awareness) containing it. The slightest misstep could disrupt internal Yin-Yang harmony, akin to the solstices and equinoxes falling into chaos: winter turning to scorching heat or midsummer yielding hail. Such imbalance scatters the "lead and mercury" (symbolizing Jing and Qi), triggering erratic physiological reactions.

Quoting the Fuming Pian (Treatise on Returning to Life), the text concludes with an analogy: just as the cosmic parents Qian (Heaven) and Kun (Earth) give birth to three sons and three daughters, practitioners must ensure their internal Yin and Qi move like filial children, obedient to natural laws. With such devotion, the cultivator’s sincerity will resonate not only within but also far beyond.

This scripture elucidates the essential principles of Neidan (internal alchemy, the Daoist practice of refining Jing, Qi, and Shen), with its core teaching revolving around the law of "movement and stillness following constant patterns."

The text first explains the concept of the "Sovereign Pole" (Huangji), which refers to the central position within the human body (typically corresponding to the Dantian, the energy center), where energies from all directions converge. If practitioners cultivate with the sincerity of a filial child, they can stimulate harmonious energy circulation within their bodies, manifesting auspicious signs described metaphorically as "tigers roaring and dragons emerging, phoenixes soaring and luan-birds dancing" (all symbolic representations of Qi movement during cultivation). Conversely, actions that violate cultivation principles will lead to the dissipation of the "Mysterious Pearl" (referring to Jing-essence) and the escape of the "Spiritual Mercury" (referring to Shen-spirit). Such individuals are not true cultivators but destroyers of the alchemical path.

The scripture mentions that cultivation outcomes may bring either misfortune or blessing, peace or chaos (metaphors for different physical-mental states resulting from proper or improper practice), all determined by the practitioner's inner state. Specifically:

The firing process (methods for regulating internal energies) requires particular attention: when genuine "medicine" (abundant Jing-Qi) is present within the body, applying the firing technique will naturally circulate energy. However, forcibly activating the firing process without sufficient "medicine" will cause false fire to rise, ultimately harming oneself. This resembles how True Lead (kidney Jing) originates in the Kan Palace (lower Dantian) and requires martial fire (intense mental focus) for refinement. Once it ascends and combines with True Mercury (heart Shen), one must transition to civil fire (gentle mental observation) — this is the stage of "guarding the city and bathing." Failure to properly manage this transition will cause problems.

The foundation of cultivation lies in adhering to the principle of "movement and stillness following constant patterns": during Kun periods (phases of extreme stillness), one must wait quietly for vital energy to emerge; during Fu periods (initial stirrings of Yang energy), one should guide the process accordingly. When movement is required, stillness should not interfere; when stillness is needed, movement must not intrude. Ancient adepts achieved success precisely because they could "move when movement was called for, and be still when stillness was required," perfectly aligning with natural rhythms.

The passage repeatedly emphasizes that cultivation must strictly follow internal laws—any violation of natural principles will lead to failure or even self-inflicted harm.

Modern practitioners often fail to comprehend the dynamic balance of movement and stillness in alchemical practice. Some focus solely on movement, others only on stillness. What they call "movement" merely refers to the physical act of breathing exercises, while their understanding of "stillness" is limited to the passive state of seated meditation—both interpretations are fundamentally mistaken. Doesn't the Thirty-Nine Chapters of Pointing to the Mysterious state it clearly: The body's Qi and blood flow naturally, with Yin-Yang in perpetual motion—why then should one shut themselves away to practice breathing techniques exclusively? This is like adding a head atop one's head; why mistake mere respiration for true "movement"?

The Cuixu Treatise similarly notes: The true operation of Heaven (Qian) and Earth (Kun) requires no forced silence. If one rigidly maintains a thoughtless, blank state, the spirit (Shen) will instead grow dull—how could such stagnation possibly coalesce into an immortal embryo? How can this be considered genuine "stillness"? While the Great Compendium of the Golden Elixir states that Yang governs movement and Yin governs stillness, Master Cuixu emphasizes seeking stillness within movement and purposeful action within stillness. This subtle interplay of movement and stillness must be transmitted orally from master to disciple—students should never presume to discuss it based on personal speculation alone.

Regarding seasonal harmonization in practice: The four seasons here refer to the internal cycles of Yin-Yang transformation—spring, summer, autumn, and winter within the human body. Cultivation requires skillful adjustment to these rhythms, allowing the body's warmth, coolness, cold, and heat to each find their proper expression. As Lü Dongbin's verse states: "Only when water and fire balance do they become medicine; when Yin and Yang fall into disorder, no elixir can form"—the essence lies in this art of harmonization.

The principle of balancing firmness and softness: "Firmness" refers to Yang Qi's vigorous strength, while "softness" denotes Yin Qi's gentle pliancy. Their boundaries must remain distinct, never interfering with one another. When Yang Qi operates, focus should remain steadfast in the lower Dantian, never scattering upward; when Yin Qi circulates, concentration should center on the upper Dantian, never dispersing downward. Zhang Ziyang's Stone Bridge Song declares: "Water generates fire, fire generates water—these two must march in separate ranks," precisely illustrating this doctrine.

The method of returning the Five Phases (Wood, Fire, Earth, Metal, Water) to their proper stations: Wang Liangqi's Hymns of the Celestial Youth Scripture teaches that these five elements must jointly guard the Dantian. When dispersed, they transform into Qi circulating throughout the body; when gathered, they coalesce in the Dantian as supreme treasure. By maintaining them stably in the Dantian—neither excessive nor deficient—they intermingle harmoniously, ultimately condensing into golden liquid elixir. What the Cuixu Treatise calls "spiritual mercury" refers precisely to this essential substance produced through the harmonization of the Five Phases.

The key to cultivating true Qi lies in maintaining proper moderation—neither excessive nor deficient. Overexertion damages primordial Qi, while insufficiency fails to nourish life. The optimal state is maintaining a subtle, continuous breath that seems to hover between existence and non-existence, gently guarded by conscious awareness. Through persistent practice, when the time ripens, true Qi will naturally flow abundantly, reaching the state where spiritual illumination arises spontaneously.

The principle of cultivation is illustrated through the movement of the sun and moon: just as these celestial bodies cycle perpetually along the ecliptic (the sun's apparent path across the celestial sphere), during the waxing moon yang energy grows while yin recedes (the ethereal soul expands as the corporeal soul diminishes), and vice versa during the waning moon. The human body mirrors this cosmic pattern—the head symbolizes Heaven (Qian) and the abdomen represents Earth (Kun), with the rise and fall of yin-yang energies within corresponding to celestial movements. Masters of Neidan (internal alchemy) emulate this solar-lunar rhythm.

The core of cultivation lies in opening the Ren and Du meridians (the body's two most important energy channels): The Ren meridian originates below the abdomen, ascending along the midline to the throat as the convergence of yin channels; the Du meridian begins at the coccyx, rising along the spine to the crown as the governor of yang channels. Ren derives its name from governing conception (women rely on it for gestation), while Du commands all meridians. Legendary long-lived creatures like deer, turtles, cranes, and toads are said to possess innate通畅 (unobstructed flow) in these pathways. The Nanhua Zhenjing (Zhuangzi) states "follow the Du as your guiding principle," encapsulating the secret of longevity.

When Ren and Du meridians flow freely, the body's Qi and blood circulate unimpeded—this constitutes the foundation of the path to immortality. As cultivation verses attest: when true Qi ebbs and flows like tidal rhythms in ceaseless daily cycles, it prevents illnesses caused by stagnation, preserving youthful vitality. The poetry of Langranzi confirms this principle—human meridians resemble earthly rivers, where unobstructed flow ensures vibrant vitality.

This scripture primarily explains the pathways and principles of Qi (vital energy) circulation in Daoist Neidan (internal alchemy) practice. It cites perspectives from several eminent masters (such as Chen Xiyi, Han Xiaoyao, and Lü Chunyang) to illustrate:

During cultivation, true Qi ascends from the lower Dantian (energy center) through the spine (coccyx) to the crown of the head (Muddy Pellet Palace). When the energy channels become unobstructed, one achieves enduring youthfulness. Regularly directing Qi to impact joint acupoints naturally leads to abundant Jing (essence) and enduring Shen (spirit). This isn't empty talk, but a secret transmission of cultivation methods dating back to ancient primordial sovereigns.

The text employs various metaphors for this cycle: some call it the "Center of the Circle," others name it the "Zhou Tian" (Celestial Circuit), yet all refer to the ascending-descending circulation of true Qi within the body. The Daode Jing's reference to "the valley spirit never dies" (indicating Dantian Qi), the Yinfu Jing's teachings on day-night cultivation, and the Huangting Jing's descriptions of mental circulation all expound this same principle.

Multiple patriarchs describe this process differently: Qi cycles from the crown (Celestial Valley) to the lower abdomen (Yin Extremity); connects from coccyx to Muddy Pellet; flows among the three Dantian fields (upper, middle, lower); or operates ceaselessly like the sun-moon alternation or wheel rotation. Though appearing motionless in seated meditation, this internal Qi movement secretly aligns with cosmic operation—the essential method for longevity.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) cultivation, drawing upon various classical texts to demonstrate how practice must align with natural rhythms and the cyclical movement of internal energies.

Practitioners should emulate celestial patterns by continuously circulating their internal Qi throughout the twelve two-hour periods of the day (ancient Chinese timekeeping). The Zi hour (11pm-1am), when Yang energy first emerges, holds particular significance. The application of the Five Phases (Wood, Fire, Earth, Metal, Water) must follow the operational laws of Heaven and Earth (Qian and Kun), allowing the dual forces of Yin-Yang and Five Phase energies to flow naturally.

The text cites methods from several accomplished adepts: Liu Gaoshang emphasizes that concentrated Shen (spirit) generates authentic Qi—not the breath entering through nose and mouth, but the internal energy whose rising and falling synchronizes with cosmic movements. Liu Xugu describes this energy cycling vertically like an axle and rotating horizontally like a door pivot. The Hunyuan Treasure Scripture advises uninterrupted practice mirroring celestial motion, containing the energy of the Nine Heavens within one's six-foot-tall body.

Key cultivation points include: mobilizing spiritual power during daytime while nurturing Jing (essence) at night, carefully regulating energy increase and decrease. The crucial element is the "Yellow Matron" (conscious intention as regulator) coordinating the process, just as the "River Cart" (a Neidan term for Qi circulation) operates ceaselessly day and night in harmony with creation's rhythms. When Qi circulates without leakage—like the sun and moon's revolutions—one ultimately attains the state of Wuwei (non-action) and serene clarity.

Different scriptures employ varied metaphors: some call it "somersaulting" (referring to the Microcosmic Orbit), others "turning the mind-wheel" (mental rotation), or "emulating Heaven's pivot" (following celestial patterns). Essentially, all describe maintaining the Taiji (Supreme Ultimate) harmony through natural breathing to preserve primordial vitality. The Neizhi Tongxuan Secret Verses lament how people consistently reject this simple truth, chasing complicated methods instead: "Worldlings never cherish the true teaching, forever obsessed with heretical paths."

The moment between the last and first day of the lunar month (called huishuo) refers to midnight on the thirtieth day. In alchemical practice, specific hours replace calendar days, making the transition between Hai (9-11 PM) and Zi (11 PM-1 AM) hours the true huishuo moment for inner refinement. This temporal juncture holds profound significance: here the cosmos opens anew, sun and moon unite, vegetation sprouts, and the body's yin and yang energies converge. Immortals choosing this hour for alchemy achieve perfect resonance between inner and outer realms, like matching tally halves with flawless precision. This moment corresponds to the "true primordial intersection" in the Qian hexagram's four virtues from the Zhouyi, and marks the transition between Kun and Fu hexagrams in the twelve monthly hexagrams—the most subtle pivot point where Heaven, Earth, and humanity interweave.

During the primordial chaos before yin and yang separated, masculine and feminine energies intermingled indistinctly. In this undivided state, spirit (shen) condensed and vital breath (qi) coalesced into seamless unity. Practitioners experience dissolution of bodily awareness and cosmic perception, merging completely with the Dao as all distracting thoughts vanish. This ineffable condition might provisionally be termed "the Supreme One containing true qi" or "primordial qi." The Cuixu Pian states that refining the great medicine (Golden Elixir) requires gathering the Three Treasures—essence (jing), qi, and shen—into a single crucible to form the "elixir sprout," which fundamentally means harvesting this primordial qi until it blossoms as "yellow sprouts" (the elixir's first signs) and matures into "jade flowers." Immortals possess no secret beyond taking this primordial qi as the elixir's foundation. With diligent practice, one may ultimately attain the realized state of masters like Zhongli Quan and Lü Dongbin. The Fuming Pian speaks of harvesting the undivided cosmic qi from creation's dawn, seizing the essence when "dragon and tiger" (heart-fire and kidney-water) first unite, then guiding it into the yellow courtyard (dantian) to forge the supreme treasure. It cautions practitioners to gather with utmost discernment, for the primordial qi's movements defy prediction—the slightest misstep forfeits the opportunity. The gravest errors stem from clinging to deliberate methods while overlooking the Dao's spontaneous nature, or fixating on collection techniques while missing their essence. The Chongzheng Pian employs metaphor: like a black dragon sleeping in fathomless depths, its glowing pearl (symbolizing primordial qi) radiates crimson light beneath the jaw. One must approach with silent reverence to harvest successfully, aligning with celestial timing through spiritual skill. True gathering means receiving without grasping; authentic attainment means possessing without seeking—the crux lies in apprehending the mystery through stillness.

This scripture expounds the mystery of "primordial Qi" (Xiantian Yiqi) in Daoist cultivation. When the Yellow Emperor lost the Mysterious Pearl (a metaphor for primordial true Qi) symbolizing the great Dao, he first sent Knowledge (wisdom), then Li Zhu (vision), and Chi Gou (speech) to retrieve it, but all failed. Only when he dispatched Xiang Wang (the state of formless oblivion) was the pearl recovered. This illustrates that to attain primordial Qi, one must reach a state transcending physical form and sensory perception.

The Jirang Ji states: The primordial realm resembles the Great Void (Taixu, the cosmic origin), whose truth can only be perceived in thoughtless tranquility; conscious effort belongs to later-stage cultivation. Authentic primordial existence mirrors the undifferentiated state before the division of Taiji (Supreme Ultimate) and the separation of Yin-Yang—corresponding in practice to moments when the mind achieves perfect stillness and returns to its source. The Hunyuan Baozhang declares: Only in absolute stillness can one resonate with the subtle mechanisms of Yin-Yang's creative transformations. The Cuixu Pian further clarifies: Primordial essence isn't sought in the kidneys, but in the mind's deepest recesses.

Authentic primordial Dao requires attaining extreme emptiness and stillness. When all thoughts dissolve, wondrous meditative states emerge: the body's eight meridians return to their origins, breathing ceases, and one enters profound chaos (Hundun)—spontaneously generating the mystical transformation of "creation from nothingness." Master Ningxuan's verse observes: True cultivation occurs neither in mundane society nor mountain forests, but in the most profound inner depths.

Contemporary misunderstandings abound: some equate the primordial with "true lead" (Zhenqian, a Neidan term), others with kidney Qi, the navel, or the Ancestral Cavity (upper Dantian)—all partial views. The Yijing defines "primordial" as the fundamental state of cosmic origin. Authentic primordial cultivation hinges on achieving thoughtless tranquility where form and spirit are both forgotten.

This passage describes the mystical state of celestial-human resonance achieved during Neidan (internal alchemy) practice, the Daoist method for cultivating longevity. First, the "precelestial" state: when practitioners completely align with the natural Dao (the Way), even heaven cannot contradict this harmony. Then the "postcelestial" state: when specific celestial timings arrive, practitioners must actively synchronize with these moments. Only those truly attuned to the Dao can accomplish this.

When the two energies of Yin and Yang (the fundamental forces constituting all things) perfectly merge, a subtle substance flows and nourishes the entire body. It resembles spring vitality emerging through miles of dark clouds or clear dew condensing in the highest heavens—this is the true manifestation of Yin-Yang interaction. At this stage, the practitioner's Shen (spirit) energy fills heaven and earth, reaching up to the clouds and down to the depths, transforming like mist in mountains, vapor over water, winter snowflakes, or sediment settling in a stream. This reflects the harmonious interplay of Yin and Yang within the body's microcosm.

When the time is ripe, the internal Qi (vital energy) suddenly surges like underground fire erupting or mountain springs gushing forth, nourishing the entire body and mind. Ancient poets described this wondrous moment of indistinct Yin-Yang transformation and cosmic rotation—a phenomenon difficult to believe without firsthand experience.

The divine mysteries of heaven and earth are unfathomable. When Yin and Yang unite, all hidden forces withdraw, marking the moment of celestial revelation. Similarly, when the "dragon and tiger" (symbolizing the heart's Shen and the kidneys' Jing (essence)) merge within the body, even ghosts and spirits cannot perceive it—this is the moment of human revelation. Aligning the divine within the body with that of the cosmos leads to sudden enlightenment in meditation, where internal and external become one. The true foundation of immortality exists beyond form and appearance; only by relinquishing conceptual thinking can it be perceived. If ordinary thought could grasp it, it would not be divine.

Practitioners must learn to conceal themselves. Just as the sun and moon converge in the north during the new moon (Hui) and dark moon (Shuo), their light turning inward, Neidan practice chooses the midnight hour when the Kun (Earth) and Fu (Return) hexagrams shift—sitting cross-legged....

In practice, one should sit as motionless as a mountain rock, keep the mouth closed without speaking, and let the breath lie dormant like a hibernating snake. This is the method of stabilizing body and mind through stillness, concealing one's form. At this time, one must hold the inner light (neiguang, the spiritual radiance within) and silently turn the gaze inward, allowing the breath to become long and continuous, gradually returning to the Dantian (the lower energy center). Over time, one will feel body and mind entering a profound and mysterious state, as if standing at the edge of an unfathomable abyss. This is precisely the moment when Shen (spirit) and Qi return to their root, when body and mind recover their original essence, and when the Golden Elixir (a term in Neidan referring to the refined essence produced through cultivation) begins to condense.

The Cuixu Pian states: When Qi sinks into the Dantian to nourish the inner elixir (symbolized by the white crow), only then can it be called "forming the yellow sprout" (a sign of the initial formation of the inner elixir). If the mind is as restless as a monkey and thoughts gallop like wild horses, Shen and Qi will scatter and leak outward—how could one possibly succeed in condensing the Returned Elixir (an advanced stage of Neidan)?

This passage uses celestial phenomena as metaphors for the firing process in alchemy: it begins in the northeast, where the constellations Ji and Dou reside, then rotates to the right. Just as the moon begins to show its faint light on the third day (symbolizing the emergence of yang), it appears above the constellations Mao and Bi in the southwest, manifesting the signs of the Zhen trigram (representing the initial stirring of yang), emitting subtle radiance. Here, the text references the six pre-heaven trigrams and the six lines of the Qian hexagram, aligning with the moon's positions among the twenty-eight lunar mansions—all serving as metaphors for the waxing and waning of yin and yang in the alchemical firing process.

The transformations in the firing process of Neidan cultivation follow exactly the same pattern as the moon's phases. When the moon first reveals its faint light on the third day, it begins in the northeast where Ji and Dou reside, rotating to the right until, by evening, the crescent appears above Mao and Bi in the southwest. This phenomenon mirrors the initial stirring of yang energy symbolized by the Zhen trigram.

This scripture employs the moon's phases and the transformations of the six lines of the Qian hexagram (one of the Eight Trigrams [Bagua], symbolizing heaven and yang) to illustrate the "fire times" (huohou)—the harmonious interplay of intention and breath—in Neidan (internal alchemy) practice. The initial yang line (Chujiu) of the Qian hexagram corresponds to the nascent stirring of yang fire (yang qi) in the early stages of cultivation, akin to the first quarter moon on the eighth lunar day, where half the moon is illuminated, resembling the Dui hexagram (symbolizing marsh). The second yang line (Jiuer) represents the midpoint of yang fire cultivation, mirroring the full moon on the fifteenth day, when the moonlight is brightest, taking the form of the Qian hexagram. The third yang line (Jiusan) signifies the culmination of yang fire, analogous to the moon beginning to wane after the sixteenth day.

The fourth yang line (Jiusi) marks the ascendancy of yin fu (the movement of yin qi), resembling the last quarter moon on the twenty-third day, where the moonlight dims by half, taking the shape of the Gen hexagram (symbolizing mountain). The fifth yang line (Jiuwu) indicates the halfway point of yin fu cultivation, corresponding to the new moon on the thirtieth day, when no light remains, embodying the Kun hexagram (symbolizing earth). The top yang line (Shangjiu) represents the completion of yin fu cultivation. Wei Boyang (Master Wei) uses these six hexagrams in conjunction with the six lines of Qian to elucidate the shifting phases of fire times, as Neidan is a practice of pure yang, and the Qian hexagram embodies this purity.

The scripture also references "using nine" (a unique line statement in the Qian hexagram), denoting the nine cyclical transformations of fire times, symbolizing the ceaseless circulation of yang qi. Practitioners must emulate the vigilance described in the Qian hexagram's third line ("alert day and night as if facing danger") and the struggle depicted in the Kun hexagram's top line ("dragons battle in the wilderness," representing the clash of yin and yang). This requires balancing "civil fire" (gentle intention) to "guard the city" (maintain stability) and "martial fire" (intense intention) to "wage battle in the field" (breakthrough), all while remaining ever mindful of potential pitfalls.

Finally, the meaning of "using nine" is explained: Nine is the number of yang, derived from the sum of heaven's numbers (1 + 3 + 5), while earth's numbers (2 + 4) yield six. Hence, Qian uses nine and Kun uses six. In alchemical methods, "using nine" refers to the ninefold cyclical refinement of fire times, emulating the dynamic and unyielding nature of the Qian hexagram. Each phase must seamlessly transition into the next without the slightest error. The entire process unfolds like the ceaseless revolution of celestial bodies (with "xuanji" pointing to the Northern Dipper)—elusive yet bound by immutable laws.

This passage discusses the crucial aspects of balancing Yin-Yang and controlling the firing process (huohou) in alchemical cultivation. The term "golden emotion and wooden nature" (jinqing muxing) refers to the two opposing yet unified forces—metal (representing emotional consciousness) and wood (representing innate nature)—which are separated like things in opposite directions. If one can grasp the rhythm of the Big Dipper's movement (the mechanism of its handle), wood's nature will draw near to metal, and metal's emotion will cleave to wood, unifying what was once divided. This is the principle of "harmonizing emotion with nature" (tuiqing hexing).

In cultivation practice, the cyclical rising and falling of Qi (the ascent and descent of the celestial pivot, xuanji shengjiang) is as elusive as the transformations of the six lines in the Zhouyi (Book of Changes), having no fixed position yet embodying the fundamental principle of the Yijing. Here, the six lines specifically refer to those of the Qian (Heaven) hexagram, which, when extended, give rise to the patterns of all sixty-four hexagrams—all sharing the same underlying logic.

The "ninefold reverted elixir" (jiuzhuan huandan) represents the most mysterious stage in alchemy (the supremely profound mechanism of nine cycles), spanning from the Yin hour (3–5 a.m.) to the Xu hour (7–9 p.m.), during which firing control is most critical. This period involves subtle operations such as the increase and decrease of Qi (adding and withdrawing, choutian jin tui) and the timing of Yin-Yang interaction (bathing and intertwining, muyu jiaojie). The Perfected Master Wei Boyang (Wei Gong) dared not reveal these secrets lightly, hinting at them only through the Zhouyi's phrase "the creative origin employs the nines" (qianyuan yong jiu).

From a modern perspective, the "reverted elixir" in alchemy actually corresponds to the patterns of Yin-Yang transformation within the human body, while the "ninefold firing process" mirrors the movement of Qian's Yang Qi internally. This inner transformation of Yang Qi has no observable hexagram, follows no fixed pattern, and neither its beginning nor its end can be perceived. It cannot be grasped through any concrete form.