《還丹肘後訣》

The Huan Dan Zhou Hou Jue (Elixir Reversion: Essential Techniques) is a ten-volume work by the renowned Eastern Jin dynasty Daoist Ge Hong (known by his religious name, Master Zhichuan). While nine volumes detail medicinal formulas and herbal remedies, the first volume exclusively expounds the essential techniques for refining the Golden Elixir (Jindan). It particularly addresses distinguishing genuine from counterfeit mineral-based elixirs, identifying "yellow sprouts" (huangya, foundational alchemical material), and mastering fire regulation—critical knowledge recorded to provide clear guidance for later practitioners and prevent errors. Mastering these techniques, the text asserts, ensures halfway success in refining the "Great Medicine" (Golden Elixir). It further emphasizes that core oral instructions require intuitive comprehension, aiding perplexed seekers in achieving immortality.

The text reveals that the precious Golden Elixir originates from a single substance undergoing differentiation. This process mirrors the movement of Yin-Yang energies: Fire (Bing-Ding) arises from Wood (Jia-Yi), akin to the "hidden dragon" of the I Ching's initial Yang line, where Yang energy stirs in the eleventh lunar month. The Celestial Mandate (Tianfu, the natural rhythm of energy) releases its power during the Awakening of Insects solar term, as all things draw vitality from Earth (Tu). The Dao begets One, One begets Two, Two begets Three—this "Three" constitutes the root of Yang energy. The union of the numbers Three and Five with the One forms the very foundation of elixir refinement.

The Celestial Mandate operates as the purest energy between heaven and earth, the source of the Five Phases (Wuxing). It follows precise temporal cycles: years divide into months, months into days, days into hours, and hours fold back into years—a perpetual rotation governing the growth of all things. In primordial chaos, vital essence (Jing) split into Yin and Yang energies. As the Big Dipper cycles through the twelve earthly branches, time flows ceaselessly, and the interplay of Yin and Yang generates the myriad beings.

The Celestial Mandate earns its name "Covenant" (Xin) for its flawless role in transformation. Yang energy moves covertly, condensing into essence, which then crystallizes as cinnabar. Vibrantly red, cinnabar inherits the fiery nature of the South (Bing-Ding), outwardly Yang yet inwardly concealing Yin—a masculine symbol. The sun embodies Yang's hun (ethereal soul); bathed in solar and lunar essences, when the sun's and moon's (Taiyin) energies harmonize over 1,800 years, they coalesce into cinnabar's quintessence. After another 1,800 years under the Celestial Mandate's radiance, vermilion forms, yielding mercury (symbolizing water). This Yang-housing-Yin substance is called the "Vermilion Bird of the Great Yang," governing the Water phase. When primordial Qi (Yuanqi) remains immature, it is termed cinnabar. Alternate theories describe "Celestial Lead" (Tianqian, primordial Qi) as the union of male dragon essence and female blood: through north-south inversion, mercury—Yin in nature, governing Water, numbered "One"—is extracted from vermilion. In alchemy, mercury symbolizes the minister's role. Celestial Lead and Divine Water (Shenshui), forged by the Celestial Mandate's cyclical radiance and celestial fire over yet another 1,800 years...

(Note: The translation preserves the original's technical terms while adapting classical metaphors into fluid prose. The ellipsis maintains the textual fragment's open-ended quality, consistent with Daoist esotericism.)

When yang energy is abundant while yin energy is weak, the flourishing yang overflows and circulates continuously. At this stage, a unique substance naturally forms, inheriting the properties of the northern Ren-Gui Water (representing the water element in Daoist Five Phases theory, associated with the north and heavenly stems). It appears soft and yielding externally but is internally strong and firm.

This substance is connected to the yin essence of the moon (the lunar yin aspect) and is no ordinary worldly matter. The flowing substance naturally generated within red ore is called "yang mercury," also known as the "essence of celestial lead," which serves as the foundation for refining "yellow sprouts" (a Neidan term referring to the nascent form of the elixir). This is a naturally formed "returned elixir" (a high-grade alchemical substance) transformed from the essence of the sun and moon, capable of spontaneously "subduing fire" (a Neidan term for controlling heat in alchemical processes).

When the black substance transforms into its northern nature, it achieves its western attribute. The number governing Metal (one of the Five Phases) is four, while the foundation of Water is three—hence the saying "three, five, and one" (an alchemical numerical metaphor). These are the finest essences of heaven and earth: three represents the parents of Fire, five the parents of cinnabar, and one the progenitor of cinnabar. They cycle and intermingle, their vital energies fusing, and their final form never transcends the root of "one." This "one" is the origin of the great Dao, representing Water.

Practitioners often fail to recognize that cinnabar is lead, and the offspring born from lead is gold. This substance inherently contains both yin and yang, capable of self-movement and self-restraint: yang contains yin, yin contains yang, and within the profound lies even deeper mystery—this is called the "Black Tortoise" (one of the Four Symbols, representing the north). Stone transforms into water, and water gives rise to metal; thus, cinnabar is born from gold. That which dominates within yin is called lead-gold, circulating according to celestial patterns for 4,320 years, illuminating its parents (yin and yang), and ultimately nurturing celestial lead, which spontaneously forms the returned elixir.

The essential secret of alchemy states: later sages used fire phases to symbolize the transformations of the hexagrams. A month consists of 360 time-periods, and the annual cycle of climatic phases totals 4,320 time-periods—precisely matching the natural formation cycle of the returned elixir. This elixir is called cinnabar-mercury, where metal contains water, water resides in the north while fire resides in the south, the dragon is in the east and the tiger in the west (directional symbolism in Daoist alchemy). The Five Phases unite into one, ultimately returning to the root of "one." Only by regulating the fire phases in accordance with seasonal transitions can the Golden Elixir be successfully refined.

Another key principle notes: cinnabar originates from the Kun (Earth) region of the southwest (the southwestern trigram in the Bagua) among the twelve terrestrial divisions of the Central Plains. This treasure is the purest substance between heaven and earth, the harmonious and upright qi of primordial energy. Through the celestial patterns of the sun and moon's movements, it intermingles and is generated within the number "five"—five representing the central Wu-Ji Earth (the earthly stem and direction of Earth in the Five Phases). The place where cinnabar forms must be a geomantically blessed land, where mountains and terrain meet strict requirements: the "qi, blood, bones, and flesh" (metaphors for geological features) must all possess the superior qualities of Metal, Water, and Wood. Only where the "bones and flesh" (geological structure) are complete will vegetation flourish, soil and rock remain firm, and such extraordinary landscapes be protected by divine spirits.

Here, the qi of yin and yang is released and contained, nurtured and illuminated. When essence receives the nourishment of Earth, it transforms and generates cinnabar. In all places where cinnabar forms, on nights following rain when the skies first clear, a distinctive radiance will manifest.

This scripture primarily elucidates the marvelous properties and formative principles of cinnabar (zhusha). In dark environments, high-quality cinnabar emits a flickering radiance resembling sunlight, discernible only to experienced herb gatherers. Cinnabar bears numerous alternative names: red lead, celestial lead, fiery lead, golden essence within lead—all referring to the same substance.

The finest cinnabar originates from specific regions like Guifu, Chenjin, and Hengqiu, found in mountain caverns where its surface gleams like a mirror, its hue as vividly translucent as lotus petals. Graded into three tiers: the superior resembles an emperor in nobility, the medium grade parallels distinguished ministers, while the inferior is likened to common folk who merely follow orders. Only premium-grade cinnabar qualifies for refining advanced elixirs.

The text employs Yin-Yang theory to explain cinnabar's formation: the sun embodies the quintessence of Yang energy (tianfu, celestial tally), while the moon represents Yin's essence. The sun rising from the eastern (Jia position) belongs to double Yang, whereas the moon ascending from the western (Geng position) pertains to double Yin. Cinnabar absorbs these solar and lunar essences, gestating within earth to become the revered "Vermilion Bird"—the most exalted among seventy-two minerals. This substance, coalesced from heaven-and-earth's purest energies, is considered the fundamental basis for crafting immortality elixirs.

The mentioned "zengqing" refers to a bluish mineral, while "Kan," "Xun," and "Dui" denote trigrams from the Bagua (Eight Trigrams), representing water, wind, and marsh respectively. These concepts constitute essential terminology in ancient Daoist alchemical theory.

This scripture elucidates the core principles and operational methods of Daoist alchemy, centered around the pivotal concept of "lead and mercury" (qianhong).

The most essential material in alchemy is mercury (liquid silver), which resonates with the twenty-four seasonal nodes of heaven and earth. The text employs metaphors to illustrate the miraculous effects of the elixir: chickens consuming it transform into phoenixes, serpents ingesting it become dragons, and humans partaking of it attain longevity equal to heaven and earth. Through specific cultivation methods (gathering the hun and po souls), one can reverse aging and even summon wind, clouds, and jade maidens (referring to yin energies or divine manifestations during practice).

The crux of alchemy lies in comprehending the yin-yang attributes of "lead and mercury":

• The liquid extracted from red lead (cinnabar) belongs to water—it is the yin mercury within yang
• The substance naturally exuded from cinnabar belongs to yin—it is the yang mercury within metal

Alchemy follows the generative and controlling cycles of the Five Phases: wood is controlled by metal, metal generates water, yet water depends on metal; wood generates fire, but controlling fire requires water. Thus lead water controls mercury water, and lead fire controls mercury fire.

The text particularly specifies:

• Lead water refers to the naturally exuded yang mercury from cinnabar
• Mercury water denotes artificially extracted yin mercury
• Lead fire indicates naturally generated metallic nature
• Mercury fire represents artificially extracted liquid

Few understand this principle of yin-yang mutual control. The sun embodies fire essence (mercury, belonging to wood, symbolized by the dragon), while the moon contains water essence (lead, belonging to metal, symbolized by the tiger). The dragon symbolizes yang qi (ultimate number nine, wood's essential qi), the tiger symbolizes yin qi (ultimate number four, metal's essential qi).

The essence of alchemy lies in using the formless to control the formed. Cinnabar's fundamental nature is wood essence, requiring combination with metal. Heaven, earth and humans each possess three treasures: heaven has sun, moon and stars; earth possesses rivers, lakes and seas; humans harbor jing (essence), qi (vital energy) and shen (spirit); while medicine contains water, earth and metal. The alchemical vessels symbolize qian and kun (upper and lower crucibles), the medicinal substances represent kan and li (water and fire), and the operational process resembles zhen and xun (advance and retreat). After three years (totaling 12,960 double-hours, including intercalary months) of cultivation, having gathered sufficient primordial qi of heaven, one can refine the Golden Elixir. If primordial qi is insufficient, the elixir becomes worthless as rubble; when all phenomena commune with the numinous, one achieves resonance with divine intelligence.

This passage explains the key principles of refining the "Great Return Elixir" (Dahuandan). Here, "golden cinnabar" refers to this elixir, with the term "return" signifying the process of reverting to one's original source.

The alchemical process unfolds as follows: Through the operation of yin methods (cultivation techniques), innate qi is transformed into primordial essence (yuanjing), which then becomes cinnabar (zhusha). The cinnabar is further refined into mercury (gong), and the mercury into gold, ultimately yielding the golden elixir (jindan). The elixir is called "cinnabar" (dan) due to its crimson hue; mercury serves as its fundamental substance, requiring the mutual restraint of metal and water—hence the name "golden cinnabar." When it ultimately returns to its original state, it becomes the Great Return Elixir.

The refinement requires the harmonization of the five qi (the energies of the Five Phases) within a golden cauldron. When these five qi are subdued without dispersing, they generate multicolored radiance and return to their primordial source. Consuming this grants longevity. The flowing mercury from cinnabar represents the father, while the golden essence within the central earth (wuji tu) serves as the mother. The number five holds special significance because only when earth serves as the cauldron can the medicinal substances be restrained from dispersing—hence the term "golden cauldron." Earth nurtures all things, and since metal is born from earth, metal is earth's child while earth is metal's mother.

Water is restrained by earth, which prevents its excessive flow—this demonstrates the efficacy of the central earth (wuji tu). Refining mercury requires earth's subduing power. When earth qi flourishes, metal and water coexist harmoniously, much like how virtuous rulers attract tribute from all directions. The key lies in discerning true lead and true mercury—these two substances must be refined together within the same cauldron. Metal, water, and earth share the same origin, all governed by the central earth. Without earth's restraint, the elixir cannot be formed.

Earth flourishes for eighteen days during each season, remaining dormant otherwise. Refining the golden cauldron demands meticulous study of the cyclical patterns of yin and yang essence, as precise as the markings on a water clock. Realgar symbolizes earth's nature, stabilizing the four directions. The earth mentioned here refers to a special kind that generates metal—realgar represents its yang aspect, yellow denotes its earth nature, earth restrains water, and earth serves as metal's progenitor (though this does not specifically indicate realgar as a mineral).

The cauldron's form must align with the principles of the Five Phases, termed the "five talismans" (wufu). Many fail to grasp that the foundation of the Return Elixir lies in gold and mercury as father and mother, mistakenly using literal gold and silver as parents or cauldron vessels, resulting in insufficient qi. The essence of the Five Phases cannot be separated from the six qi (three yin and three yang)—though their names may differ, their functions are distinct. Primordial qi governs the five materials (of the Five Phases), and their qi must be arranged in proper ruler-minister relationships without separation. The golden elixir employs primordial qi, not merely relying on the five talismans. These talismans signify formless qi—a qi born from essence, containing inner and outer truth. Those who ingest it attain immortality.

The golden cauldron serves as the pivotal axis for the medicinal substances, and this axis is qi itself—qi is the cauldron. The cauldron's shape resembles an egg, white on the outside and yellow within. When working with mercury, white gold must be used as the vessel. This vessel cannot exist apart from the earth of the Five Phases—it must be the special earth that generates metal. The entire process requires intricate mutual completion.

This passage explains the key principles of refining the Golden Elixir (Jindan, the core practice of Daoist internal alchemy or Neidan). The essence lies in stabilizing the energy within the alchemical furnace through the generative and controlling cycles of the Five Phases (Wuxing), with particular emphasis on the central role of the Earth element—just as the power of Wu-Ji (the Earth-associated heavenly stems) prevents water from evaporating.

The process requires "metal essence primordial qi" (Jinjing Benqi) as its foundation, akin to wielding a sword to guard the four directions. When the Water element is restrained by Earth and ceases to dissipate, a stable foundation for alchemy is established. Cinnabar (Dansha) and lead, the two crucial materials, both originate from Earth and ultimately return to it—this is the fundamental principle of alchemy.

The alchemical furnace goes by various names: Divine Water Blossom Pool (Shenshui Huachi), Divine Chamber (Shenshi), or Framework (Kuangkuo), all referring to the same vessel. Within it, the qi of the five directions (Five Phases energy) transforms through different manifestations—white robes, crimson robes (symbolizing changes in furnace fire), and the Golden Mother (metal essence). Primordial qi (Yuangi) can fill the entire furnace yet also permeate the finest details, flowing between presence and absence. Through the ninefold cyclical refinement (Jiuzhuan Huandan), the Golden Elixir spontaneously crystallizes.

Here, human procreation serves as a metaphor for alchemy: just as conception requires the merging of parental essence and blood, the formation of the Golden Elixir depends on the union of Yin and Yang qi. In the furnace, the Metal element (symbolizing masculinity) resides above, while Water (symbolizing femininity) rests below—their natural attraction leads to harmonious interaction. Notably, metallic substances sink in water, while watery substances float—this reflects their inherent nature.

Refining the Golden Elixir must be rooted in the fundamental energies of Yin and Yang. The Yang qi (father) initiates movement, while the Yin qi (mother) nurtures growth. The central Yellow Earth (Zhonggong) is the source of Metal; cinnabar itself originates from Earth qi, hence its designation as the "root of the yellow sprout" (Huangya zhi ben). Within the Five Phases' cycles: Earth generates Metal, Water generates Wood, Fire controls Metal, and Earth controls Water—these dynamic interactions circulate endlessly within the furnace. Crucially, the earthen alchemical cauldron (Danding) governs the Water element. When the primordial qi resonates mutually, the Great Dao (Dadao) is realized. This embodies the profound meaning of "knowing the white yet guarding the black" (Zhibai Shouhei)—understanding Yang while preserving Yin.

This scripture primarily expounds on the principles of Five Phase mutual generation and restraint (Wuxing) and fire regulation methods in Daoist alchemy.

First, it explains the relationships among the Five Phases: Water is restrained by Earth (Earth stabilizes Water), a relationship termed the "work of Wu-Ji" (戊己之功). Those who truly understand this principle are exceedingly rare. Fire cooks food and nurtures life; it embodies the essence of Jia Wood (the Azure Dragon of the East) and belongs to pure Yang Qi (阳气). The numerical attribute of Fire is two, where two generates three and ultimately culminates in nine—the pinnacle of Yang numbers.

The text mentions that the celestial patterns (Tianfu, 天符) govern the growth of all things: the lunar Yin pattern nourishes, the Earth's Yin pattern fosters, Fire's energy matures, while the combined Qi of Metal and Water (金水之气) nurtures all beings. These patterns mirror the movements of the sun and moon, reflected through the transformations of the sixty-four hexagrams (六十四卦) and their line changes.

Regarding fire regulation in alchemy: gentle fire (Wenhuo, 文火) must be applied gradually, attuned to seasonal shifts. The operation of the "River Chariot" (Heche, 河车)—a metaphor for the cyclical movement of Jing (精) and Qi (气) in internal alchemy—depends crucially on fire control; improper regulation leads to failure. The River Chariot symbolizes the northern cardinal position, likened to a vehicle transporting goods, and subtly references the interplay of Metal (associated with the Zi hour, 子), Water (河), and Fire (车).

Finally, the text emphasizes that alchemy must align with the rhythms of the four seasons, much like a wheel's rotation drives the transformations of Yin-Yang (阴阳). Practical operations should follow lunar months and solar terms, with fire advancement or retreat guided by the hexagrams' line changes. The optimal time to begin furnace work is the eleventh lunar month, when Yang Qi (阳气) first stirs.

Note: Here, "Fu" (符) denotes manifestations of natural law; "River Chariot" is a Neidan (内丹) term for the circulation of vital energies; "Wu-Ji" (戊己) represents the central Earth position; and "Zhifu" (直符) refers to directly observable cosmic patterns.

This passage elucidates key principles in Daoist alchemy concerning temporal cycles, the Five Phases (Wuxing), and the use of crucibles. Following the patterns of Yin-Yang transformation, the period from the eleventh to fourth lunar months represents the zenith of Yang energy (corresponding to the Fu hexagram progressing to Qian hexagram), while the fifth to tenth months mark the peak of Yin energy (Gou hexagram to Kun hexagram), forming a complete cyclical progression.

The first fifteen days of each month are called the "White Moon," governed by the elements Fire and Wood, numerically corresponding to seven and eight. The Zhen hexagram represents spring's Wood Qi (Muqi), with a generative number of three and final form number of eight; the Li hexagram symbolizes summer's Fire Qi (Huoqi), with generative number two and final form seven—their sum being precisely fifteen. The latter fifteen days constitute the "Black Moon," dominated by Metal and Water, numerically nine and six. The Dui hexagram embodies autumn's Metal Qi (Jinqi) with generative number four and final form nine; the Kan hexagram signifies winter's Water Qi (Shuiqi) with generative number one and final form six—again totaling fifteen.

The foundational Five Phases are distributed thus: North - Ren-Gui Water; South - Bing-Ding Fire; East - Jia-Yi Wood; West - Geng-Xin Metal; Center - Wu-Ji Earth. The text introduces the concept of "young father and aged son": celestial lead (cinnabar) as father and black lead as son. The father's fixed numerical value is twenty-five, corresponding to Five Phase cycles (five days constituting one minor cycle, hence five times five). All phenomena follow the Five Phase generative sequence, born from parental elements.

Regarding fire regulation methods, practitioners must align with the six-line transformations of hexagrams and solar terms, commencing from the Kun hexagram. During alchemical processes, the crucible should be changed monthly, ceasing after nine iterations—the tenth crucible permits flexible adjustment. The crucible (earthen cauldron) symbolizes the maternal vessel, while the golden crucible represents the origin of Metal generation. The application of Metal and Water must adhere to seasonal transitions: after fifteen days Metal properties wane, within thirty days the elixir takes preliminary form, and after ten months the original crucible becomes unnecessary.

The passage concludes with the metaphor of "shedding the embryo to return the elixir": just as human gestation requires 270 days, the elixir must undergo nine months of Yin-Yang harmonization and ten months of Earth Qi (Tuqi) maturation. The nine refinements correspond to nine crucibles—the talisman (Fu) embodies paternal influence while the crucible represents maternal function. Similar to an infant requiring three years to develop robust primordial Qi (Yuanqi), the Golden Elixir (Jindan) demands analogous nurturing before final completion.

This scripture elucidates the process and principles of refining the "Great Return Elixir" (Dahuan Dan), an advanced alchemical substance created through the mutual generation and restraint of the Five Phases (Wood, Fire, Earth, Metal, Water).

The crux of alchemy lies in mastering the transformations of Yin-Yang and controlling the firing process. The text describes how the four foundational materials (siwu) interact within the crucible through the dynamic interplay of Yin and Yang, with their relationships mirroring that of ruler and minister, ultimately returning to their primordial origin to form the Golden Elixir (Jindan). These "four materials" represent the Yang-within-Yin and Yin-within-Yang aspects of cosmic polarity.

The firing process requires prolonged, meticulous control: Elixir refined in the first year—consuming just one liang (about 40g)—can prevent all diseases; the "White Path" (Bai Dao) produced in the second year requires half a liang; the "Primordial Qi of the Great Void" (Tai Yuanqi) from the third year grants longevity with merely one fen (about 0.4g); five years of refinement yields an elixir where seven sesame-seed-sized pellets confer immortality; after nine years, three pellets can eradicate the "Three Corpses and Nine Worms" (parasitic entities in Daoist physiology) from the body, achieving agelessness. These elixirs also possess the power to transmute base metals into treasures.

The firing rhythm must emulate the cyclical motion of a wheel: Beginning in the eleventh month (Zi month) when Yang qi first stirs, one advances one hexagram line (yao) each month until the fifth month when Yin qi emerges, then retreats one line monthly until the tenth month returns to the Earth phase, completing the cycle. The heating should progress like steaming—too rapid and the medicinal properties dissipate; too slow and they remain unrefined. Timing must align precisely with celestial patterns, mirroring the legendary precision of Suirenshi's mastery of fire.

Cinnabar (Zhusha), a crucial alchemical material, embodies the quintessence of Yang energy, symbolizing cosmic rotation and the union of Water and Fire. Gold represents lunar essence positioned in Yang's domain, while mercury (mercurius) embodies the Li hexagram's qi corresponding to six-line transformations. These manifest the numinous energies of heaven-earth and the essences of sun-moon, demonstrating nature's principle of reversal at extremes—where Yin exhausts itself, Yang is born. Thus cinnabar is described as the product where "Wood's essence obtains Metal."

This explains the core principle of "the Dao of Three and One" in Daoist alchemy. The "Three" refers to fire regulation (control of the alchemical fire), while the "One" denotes the elixir itself—collectively termed "guarding the One."

The key materials are cinnabar (sha) and metals (jin), where cinnabar serves as the medicine and metals as the cauldron (the alchemical vessel). These three share the same origin. The great Dao is supremely simple, and truth is singular. Cinnabar possesses a mild, non-toxic nature with a pungent flavor, containing primordial Qi (Yuanqi). Even after countless refinements, it never depletes, earning it the name "black lead." This lead emerges naturally as a liquid from cinnabar, extracted during specific celestial hours (the time of the rising moon). The black liquid resonates with lunar phases like a conjugal union—the yang soul (yang energy) enveloping the yin essence (yin energy), achieving natural harmony between the two natures.

The method follows the patterns of the Five Phases (Wood, Fire, Earth, Metal, Water) and the Bagua (Eight Trigrams: Qian, Kun, Gen, Xun, etc.). Starting from the winter solstice (the month of Jianzi), when yang energy first emerges, the midnight hour (zi) corresponds to noon (wu), and the numbers five and six interconnect. Precise timing is essential, observing the movements of the sun, moon, and five planets to grasp the rhythms of seasonal shifts and day-night alternations. Each thirty-day cycle mirrors the orderly rotation of yin-yang and the seasons, akin to the cyclical flow of the sixty-four hexagrams. Water and fire balance each other without external interference. The so-called "five metals" represent the Five Phases, while the "eight minerals" symbolize the Bagua. When water encounters the dragon (symbolizing transformation), it transmutes; when fire meets the practitioner, it circulates. The key to refining the Golden Elixir (Jindan) lies in mastering these Five Phases and Bagua principles.

In practice, gentle fire (wenhuo) should not exceed nine cycles, nor should intense fire (wuhuo) surpass nine cycles. Nine is the ultimate yang number—three times three—and exceeding it turns to yin. The birth of yang from yin's extremity follows celestial law. If the ratio of metal (jin) to water (liquid medicine) is correct, it aligns with the seasons; if imbalanced, it violates natural order. The process resembles a hen incubating eggs—requiring the infusion of heaven-earth Qi to succeed—or a winter valley eventually sprouting vegetation, each with its destined timing.

The primordial Qi of solar essence (the sun's jing) originates from the southern Ding fire, positioned in the Li trigram (symbolizing fire), where two yang lines embrace one yin line, generating the sun's soul (yin mercury-water). When Qi reaches fullness, it shifts to the northern Ren water, located in the Kan trigram (symbolizing water), where two yin lines enfold one yang line, producing the moon's essence (yang mercury-metal). Water's nature is still and unmoving, embodying Wuwei (non-action); fire's nature is dynamic and ascending, representing the root of action. Only by using non-action to govern action can the great Dao be realized. When metal first emerges in darkness, it resembles the relationship between mother and child.

When metal (jin) enters the central palace (the alchemical core), it is called "Taiyi," manifesting as a blend of yellow and black. The azure dragon and white tiger (symbolizing lead and mercury, respectively) must be regulated according to Qi's movement—this is the principle of "Kan and Li in mutual accord" described in the Zhouyi Cantongqi.

This passage explains the core principles and precautions of Daoist alchemy. The foundation of alchemy lies in the mutual interaction of water and fire (the Li trigram representing fire, the Kan trigram representing water) - all things depend on water for birth and rely on fire for completion. Fire overcomes metal, water overcomes earth; it is through these overcoming relationships that the elixir can be refined.

The cyclical pattern of alchemy follows: beginning at the Zi hour (11 PM to 1 AM), progressing through the Zhen trigram (representing the east and spring), reaching peak Yang energy when fire Qi is strongest in the fourth month, then retreating and regenerating from the Xun trigram (southeast). When mercury is initially refined, it's not yet the true Golden Elixir (Jindan) - it must pass through three stages: first called cinnabar, after five months becoming gold sand, after one year called inverted growth sand (also called minor returned elixir), after two years called soul sand (middle returned elixir), and only after three years can it become the great Golden Liquid Elixir, ingestion of which can make one an upper-rank immortal.

Many don't understand the profound principles of alchemy, unaware that cinnabar is actually the fundamental transformation of lead. Common misconceptions include: mistakenly using ordinary mercury, lead, or silver for alchemy; not realizing common lead is actually the mother of worldly silver; that realgar is the child of medicinal substances; that cinnabar is the mother of lead; and that yellow earth is the father of cinnabar. Using wrong materials - such as common gold/silver for alchemical vessels or impure lead ore for medicine - has never succeeded throughout history because the fundamental principles weren't grasped. The true path to immortality actually lies before our eyes - cinnabar's essence is the quintessence of wood, dependent on earth for birth and extinguished by earth, never departing from the Five Phases' mutual generation and overcoming cycles.

Nothing surpasses the combination of internal alchemy (Neidan, cultivating internal primordial Qi) and external alchemy (Waidan, refining elixirs) for prolonging life. The cinnabar formed from the concentrated essence of sun and moon contains the harmonious Qi of heaven and earth - this is the foundation of cultivating both nature and life (Xingming Shuangxiu). Apart from the essence of internal and external golden elixirs, other methods are not worth mentioning.

Special caution: mercury is purely Yin and will corrode internal organs; gold harms the liver, silver harms the spleen, copper harms the kidneys, lead and tin harm the stomach; minerals like realgar are highly toxic and damage primordial Qi. Though some heterodox methods may temporarily suppress toxicity, they ultimately cause great harm. Even if cinnabar has some auxiliary effects, relying solely on it cannot achieve longevity.

Final emphasis: ordinary mercury and lead contain abundant Yang Qi while still in the ore, but lose their spiritual nature once refined. True alchemy must grasp the timing of Yin-Yang ascent and descent (Zi and Wu hours), through regulating civil and martial fire (alternating strong and weak flame intensity), enabling metal and wood (lead and mercury) to fuse within earth (the cauldron vessel). This requires precise control of fire phases, as rigorous as celestial movements - the slightest deviation leads to failure.

This passage elucidates the Yin-Yang attributes of mercury and lead in alchemical processes and their interactive principles.

The text clarifies that while naturally occurring mercury (worldly mercury) and the mercury extracted from cinnabar (vermilion) may appear similar in form, their essential natures differ fundamentally. Cinnabar belongs to Yang, representing the masculine principle, and the mercury it contains can harmonize with human nature (xing) and life (ming). Ordinary mercury, by contrast, belongs to Yin, symbolizing the feminine principle, and if ingested alone would damage one's vital essence. True alchemy requires understanding the mutual generation and restraint between lead and mercury—the lead (yellow sprout/huangya) can control mercury, while mercury in turn restrains lead. Only through this balanced Yin-Yang interaction can the Golden Elixir (jindan) be perfected.

A crucial distinction is emphasized: common mercury and lead cannot be directly used as alchemical ingredients. The authentic lead for alchemy is the "essence of cinnabar's offspring" (zidan jing), the quintessence extracted from cinnabar. Paradoxically, the gold (Golden Elixir) actually emerges from lead, much like a child developing within its mother's womb. Lead is revered as the "precious mediator of seven treasures," the catalytic agent essential for transmuting all metals. Failure to grasp this foundational principle inevitably leads to alchemical failure.

Through metaphorical language, the scripture illustrates mercury's volatile nature—as lively as a maiden by the river (heshang chanu), vanishing instantly when exposed to fire unless stabilized by lead (yellow sprout). Even when sealed perfectly, mercury alone will completely evaporate during heating. This exemplifies the core Daoist alchemical principle of "Yin-Yang pairing": metals (gold) belong to Yin while minerals (stone) belong to Yang. Their combination mirrors marital union, where soul (hun) and earthly soul (po) unite to accomplish the Great Dao of Golden Elixir.

This passage discusses the crucial role of "Yellow Sprouts" (Huangya, an alchemical term referring to the refined essence extracted from lead) in Daoist alchemy and its precise firing method.

Yellow Sprouts effectively control the activity of mercury, much like a mother disciplining her child. Ancient texts state that one liang (approx. 37g) of Yellow Sprouts can stabilize one jin (approx. 600g) of mercury, creating a bond as steadfast as a loyal minister serving his sovereign. True Yellow Sprouts are the refined essence extracted from lead, embodying the power of Yin-Yang and the Five Phases (Wood, Fire, Earth, Metal, Water). Mastering the refinement of Yellow Sprouts is equivalent to grasping the core technique of alchemy.

The firing process is divided into six stages, each lasting five days:

In the first five-day cycle, one liang of fire is applied. Subsequently, the intensity gradually increases—two liang in the next cycle, three liang in the following, reaching a peak of six liang by the third cycle. From the fourth cycle onward, the fire is reduced incrementally by one liang per cycle until it returns to one liang. This completes one full monthly cycle, after which the process restarts from two liang the following month.

The text emphasizes that practitioners must maintain a reverent and humble mindset. Arrogance, disrespect toward one’s master, or pursuit of fame and wealth will render even genuine teachings ineffective—not because the heavens are unkind, but because such attitudes contradict the demands of Daoist cultivation.

Lastly, it mentions that Golden Cinnabar (the refined elixir), once ingested, spreads like wind and rain throughout the body’s limbs and meridians. Yet the true secret of cultivation is surprisingly simple: unwavering focus and persistent dedication are the keys.

This passage explains the refined methods of fire regulation in Daoist alchemy, focusing on two key operations: "changing the cauldron" (replacing the alchemical vessel) and "following celestial cycles" (adhering to temporal rhythms).

During the initial nine-month cycle, the fire intensity should be gradually increased during the first five-day period (known as the "initial候") of each month, progressing from one liang (about 30g) to nine liang. By the ninth month's initial候, the fire should reach nine liang. At the crucial moment called "the golden tiger emitting essence" (when lead and mercury undergo chemical transformation), a continuous thirty double-hours (approximately 60 hours) of precise control is required. When reaching fourteen liang of fire intensity, the total duration should be sixty double-hours, with strict adherence to temporal progression and recession.

The fire regulation should mimic the blazing intensity of summer's peak yang energy in the fourth month, yet also understand when to withdraw like the nascent yin energy's emergence in the fifth month. The cauldron change should occur during the Earth's flourishing and Metal's ascendant phase (when Earth generates Metal in the Five Phases system), allowing resonance between Metal, Earth, and the primordial Qi (original vital energy).

In practical terms: beginning from the ninth month, apply nine liang of fire for thirty double-hours during the initial候, then add one more liang to reach fourteen liang—the maximum intensity—for sixty double-hours before reducing back to nine liang. After the tenth month, regardless of annual or monthly cycles, follow the ninth month's initial候 pattern: reduce from fourteen back to nine liang while maintaining sixty double-hour cycles. This process must continue uninterrupted for nine years to achieve completion.

The essential method reveals: during the first month's initial候, initiate fire with twenty-four liang representing one yao (hexagram line), symbolizing the twenty-four solar terms. Add one yao every two-and-a-half days, with five days constituting one 候. Each month contains six 候 periods, with particular attention required during the third 候's sixty double-hours and fourth 候's thirty double-hours for controlling "martial fire" (intense heat). Maintain constant fire day and night without extinguishing the flames, while keeping the total fuel quantity stable.

The text concludes with detailed descriptions of a timing device: a three-foot tall, one-foot diameter wooden barrel with a small hole near its base fitted with a feather quill, sealed with wax and filled with water. By observing the water drip rate, precise timing measurements could be obtained. This water clock must achieve accuracy comparable to ancient clepsydras to properly regulate alchemical firing. The entire celestial cycle fire process requires precisely nine and a half months to complete.

This passage reveals the esoteric methods of fire regulation in Daoist alchemy, primarily employing the trigram principles from the Zhouyi (Book of Changes) to guide neidan (internal alchemy) practice.

Alchemical refinement follows cyclical patterns like the seasonal transformations of yin-yang. Each lunar month divides into six phases (liuhou), with fire regulation progressing and retreating in specific sequences. Just as sages observe celestial patterns, alchemy must conform to natural laws. True alchemical arts are known only to celestial immortals, beyond ordinary comprehension. These fire-control secrets require direct transmission from an authentic master - incorrect medicinal proportions will inevitably lead to failure without such guidance.

The operational method compresses a year's yin-yang fluctuations into a single month. The eleventh month (corresponding to "Jianzi" or the Rat month) marks yang qi's initial emergence. Each month's first fifteen days (bright phase) belong to yang, the latter fifteen (dark phase) to yin, mirroring the annual solstice cycles where summer reaches yang's zenith and winter yin's peak. Alchemists must regulate fires according to these rhythms, harmonizing with cosmic patterns.

Crucially explained: ignition commencement corresponds to nature's eleventh month - yang qi's first stirring. During the first refinement cycle's second lunar phase (chuhou), fire regulation must emulate the "Initial Nine: Hidden Dragon" hexagram line's caution, employing only foundational yang qi. Each phase progression (one yao line) spans two-and-a-half days (thirty shichen), with five phases (one hou) completing sixty shichen - precisely five cycles of the twelve earthly branches. This replicates the eleventh month's complete zi-to-hai temporal cycle.

(Note: "Zhifu" denotes compliance with celestial timing; "yao" constitutes the Zhouyi's basic trigram units; "hou" represents time measurement where five days make one hou)

This scripture elucidates the process of "returning the elixir" (huandan) in Daoist alchemical practice, detailing its temporal cycles and the principles of Yin-Yang transformation.

The alchemical process follows lunar phases: During the first quarter moon (8th day of the lunar month), the metallic nature (jinxing) of the materials begins to fluctuate. By the full moon (15th day), this metallic quality completely dissipates. On the 20th day, as Yang energy ascends and Yin recedes, water and fire naturally harmonize to form the elixir. When the Xun trigram (one of the Eight Trigrams representing wind) governs on the 21st day, both metallic and aqueous properties are exhausted. This is not yet the supreme elixir (dadan) - a complete forty-five-day cycle must pass until the sixtieth day, when Yin and Yang alternate to produce the "elm seed elixir" (yujiadan), a preliminary form.

Alchemy obeys natural rhythms: The sun manifests threefold illumination, the moon undergoes three positional shifts, and only when solar-lunar essences unite after three transformations can perfection be achieved. The three hundred sixty time-periods (shichen, ancient two-hour units) in a month symbolically correspond to four thousand three hundred twenty periods in a year, mirroring nature's cyclical patterns.

The nine-cauldron method requires nine months: Each vessel undergoes three cycles totaling two hundred seventy days. By the tenth month when earthly Qi (tuqi) peaks, the elixir forms like an infant separating from its mother. Though water and fire oppose, they mutually generate - after forty days (the number five times eight) of gestation, followed by one thousand days of refinement, the elixir absorbs primordial cosmic energy to ultimately become the supreme black returned elixir (da huandan).

Practical methodology: Combine equal measures of metallic and aqueous materials, symbolizing the Yin-Yang balance between lunar phases. These substances share one origin but manifest dual forms - the adept must regulate firing temperatures according to Yin-Yang fluctuations. Only water and fire elements are essential; impurities guarantee failure. Success hinges on proper technique: Begin during Yang-strong days and hours, meticulously controlling duration. When metals and waters remain undifferentiated within the cauldron, apply specific methods to induce transformation, yielding an elixir white above and yellow below, imbued with true Qi.

Key materials mentioned include: cinnabar (zhusha), gold sand, golden liquor, longsha (mercuric sulfide), yellow sprouts (huangya), celestial lead (tianqian), and mercury sand - all standard mineral ingredients in Daoist alchemical traditions.

This passage reveals the secret techniques and precautions of Daoist alchemical practice. The materials used in alchemy—mercury, lead, gold, and earth—are actually symbolic representations of Yin-Yang and the Five Phases (Wood, Fire, Earth, Metal, Water). Ancient practitioners employed these metaphors to safeguard their mysteries. True seekers of the Dao understand these names and forms are ultimately unified in essence.

Several crucial prohibitions govern alchemical cultivation: practitioners must avoid all blood pollution, a matter of utmost gravity for ancient adepts. The practice site must be selected in pure and auspicious locations—sacred mountains far from funeral sites, graves, or other impure places. Daily offerings to the local earth deities (Tudi Shen) and spirit officials (Lingguan) must be maintained morning and evening with unbroken incense. The entire process requires absolute secrecy to prevent contamination from worldly observers.

The scripture particularly emphasizes that successful practice demands both a purified environment and like-minded companions of virtuous character. Specific ritual seals (Fayi, Daoist implements) must be employed—crafted during the midnight hour of the winter solstice's Jiazi day and buried three feet beneath the alchemy chamber, said to subdue disruptive spiritual influences.

Regarding timing, the text enumerates nine auspicious days for alchemy: Jiazi, Jiachen, Yisi, etc., while other dates are unsuitable. The alchemical process fundamentally revolves around the interaction of lead and mercury (representing Yin-Yang), not other minerals (the "four sulfurs and eight stones"). This reflects the natural resonance of the two primal energies (Yin and Yang Qi), mirroring human conception through the union of red and white vital essences.

A concluding verse summarizes: This true alchemical method, transmitted by celestial immortals (Tianxian), reveals the nature of metals and minerals without error. Practitioners should live simply, prioritize aiding others, and devote themselves to profound study. Those who recklessly disclose celestial secrets will plunge into the abyss of darkness.

This passage elucidates the core principles of Daoist Neidan (internal alchemy) practice. The phrase "white maiden and crimson blood's two Qi intertwining" symbolizes the fusion of Yin-Yang energies within the body (white representing Yin, crimson representing Yang). Through ten lunar months (symbolizing the alchemical process) of gestation, the complete "Elixir" (Neidan) is formed. When cultivation draws sufficient prenatal Qi (vital energy), the practitioner gains wisdom and vitality; its deficiency results in dullness and weakness.

The text employs "dragon and tiger" as metaphors for key alchemical substances: the dragon represents mercury (water), Wood, and Fire; the tiger represents lead, silver, the Golden Male (an epithet for metal), and Water. These elements interact through mutual generation and restraint: Metal generates Water, Water generates Wood, Wood generates Fire, and Fire generates Earth—the entire Dao of cultivation is contained within these cycles. The union of lead and mercury is called the "River Chariot" (referring to the pathways of genuine Qi circulation within the body). Ordinary people unaware of this principle may exhaust their family fortunes, while enlightened practitioners use it to ascend as immortals.

The author mentions that Wei Boyang's (a renowned Eastern Han Daoist) Cantongqi (The Seal of the Unity of the Three), though expounding essential techniques like Yin-Yang, the Five Phases, and the firing process of lead-mercury, remains profoundly obscure. Even with knowledge of elixir ingredients and technical details, if the practitioner's heart-mind fails to harmonize with the Dao, genuine transmission cannot succeed. Thus, the most elusive treasure is the "heart united with the Dao"—few are truly sincere in their cultivation.

The text cites Tao Zhi's (a Tang Dynasty Daoist) view: cinnabar originates from mercury, gold is born from lead—this is fundamental truth. Authentic lead and mercury differ from common quicksilver; using the wrong substances brings harm. Ancient immortals spoke only of lead and mercury (referring to Neidan essentials), never mentioning other minerals (the "four yellows and eight stones" denote various Waidan/external alchemy materials)—a principle later generations should uphold.

Finally, the passage emphasizes that cultivation's foundation lies in the Dao of Yin-Yang: their unfathomable transformations constitute "Shen" (spirit), and spirit gives birth to all things. Just as rice cultivation requires rice seeds and hatching requires hen's eggs, alchemical practice must follow the principle of like generating like. Violating this natural law makes achieving the Golden Elixir impossible.

The term "returned elixir" (huandan) refers to restoring the elixir to its original golden state (indicating the pure condition of the elixir). The key lies in mastering the firing process (control of the alchemical fire) and preserving the pure primordial Qi (innate vital energy) of the elixir itself—only then can it be considered a true returned elixir.

The "nine cycles" (jiuzhuan) in the Nine-Cycle Returned Elixir do not refer to refining lead and mercury nine times, but rather to transforming the primordial Qi of lead through nine stages of Yin-Yang transformation. Genuine spiritual elixirs are entirely generated from the interaction of Yin and Yang Qi, without any adulteration from other substances—only pure and authentic ingredients must be used. The most crucial aspect is obtaining the refined Qi of true lead (an alchemical term referring to innate essence). If one cannot recognize true lead, the alchemical process will never succeed. True lead does not change color, while true mercury (an alchemical term referring to the spirit) possesses divine power. These words from ancient immortals must not be misunderstood.

Common black lead turns to ash when exposed to fire because its true essence has been burned away, losing its primordial Qi. How could such depleted material, when combined with mercury, possibly produce a spiritual medicine? These words are meant to dispel worldly ignorance and reveal the true principles of alchemy. Those with wisdom who hear them will feel as though they have been given a cool drink while intoxicated or encountered the bright moon in darkness. By diligently studying the sacred classics and avoiding delusions, such individuals may walk with immortals and ultimately attain their realm. The foolish, however, will only doubt and disbelieve—they are not worth discussing this with.

The immortal scriptures state: The mystery of the returned elixir lies in the Three-in-One (jing, Qi, and Shen united), the essence of the dragon and tiger (Yin and Yang Qi), and the spiritual energy of heaven and earth. No other substances are needed—only the application of the Five Phases (Wood, Fire, Earth, Metal, Water). These are the true words of realized adepts. Even if later generations obtain the oral instructions, without following the methods of the ancient sages or understanding the "law-images" (the patterns of cosmic operation) they described, success will remain elusive. The law-images are the foundation of heaven and earth—when the foundation is established, the Dao naturally arises. The Three Powers (heaven, earth, and humanity) jointly govern creation and the movement of Yin and Yang. How can these three be neglected? The slightest deviation leads to vastly different outcomes—this is no empty saying.

The true oral instruction reveals: Cinnabar is the essence of the sun, embodying the righteous Qi of the south. Refined through the interplay of Yin-Yang, water, and fire, it stands at the head of the Green Emperor (the deity of the east) and is called mercury. Born from fire yet containing spiritual intelligence; lead is the essence of northern black water, transforming into the metal of western Geng-Xin, forming the generative cycle of metal producing water and water producing wood. These two are naturally paired—how could they be called divine elixirs if they were not supremely sacred? How could worldly mediocrities ever believe in this ultimate truth? I have often grieved over this. Since ancient times, all true practitioners have refined this divine medicine—only by ingesting it could they achieve the state where form and spirit both reach perfection.

This scripture elucidates the principles of cultivating the Golden Elixir (Jindan) path, using historical figures to illustrate the crucial difference between "faith and doubt."

Two contrasting examples are presented: Liu Xuanmu studied alchemy under Master Wei but abandoned the practice after a year due to skepticism, meeting an untimely death. In contrast, Yu Jingxiu diligently practiced without wavering, eventually ingesting the divine elixir to attain immortality—he has dwelled in the immortal caves of Mount Taibai for over a thousand years. Their divergent outcomes stemmed solely from the presence or absence of unwavering conviction.

The author laments how most worldly people, burdened by shallow karmic roots, remain entangled in fame, wealth, and sensory indulgence, damaging both body and spirit (Xing-Shen) without repentance. Even when encountering the Daoist path to immortality, they often respond with slander—how could such individuals ever achieve transcendence? Further examples like Xie Chongxuan and Su Dan, who attained immortality through ingesting the Golden Elixir, demonstrate how genuine adepts often move inconspicuously among ordinary people.

The text then cites essential alchemical formulas from the Cantongqi (The Seal of the Unity of the Three): the union of cinnabar (Jinsha) and mercury (Shuiyin) represents the mutual embrace of Yin and Yang. It emphasizes that cultivation requires harmonious Yin-Yang interaction ("solitary Yin cannot transform alone, isolated Yang cannot accomplish alone"), with the medicinal substances naturally transmuting through precise fire phases (Huohou, "circulating the fire through nine cycles"). Terms like "dragon-tiger encounter" (Longhu) and "white fluids swallowing each other" metaphorically describe the intercourse of Yin and Yang energies. The ultimate product—the "Purple River Chariot" (Ziheche, another name for the Golden Elixir)—enables celestial ascension.

These teachings reveal the core principle of internal alchemy (Neidan): using lead and mercury as metaphors for Yin and Yang, their copulation and fusion through controlled fire phases eventually crystallizes into the Golden Elixir. Yet the foundational requirement remains the practitioner's sincere devotion and perseverance—without these, even encountering genuine methods will bear no fruit.

The key to cultivating the Golden Elixir (Jindan) lies in mastering the correct method. Without understanding the essential techniques, a year of arduous practice would be wasted effort—like refining useless lead and mercury (alchemical materials), all one's labor would turn to dust.

The spiritual medicine nurtured by the essence of heaven, earth, sun, and moon is called "Golden Lord" (a metaphor for the Golden Elixir). Its true nature is not ordinary lead or mercury, yet it must manifest through them. Those who understand grasp it instantly, while the confused rush past it in haste. When mercury and lead merge, the principle of the Golden Radiance (the essence of the Golden Elixir) contained within is similar, yet this radiance is not a ready-made medicine—blindly manipulating it will only lead to futile labor.

The alchemical principles transmitted by immortals are actually profoundly clear. Study the Cantong Qi (a renowned alchemical scripture) carefully and follow the cyclical interactions of the Five Phases (Wood, Fire, Earth, Metal, Water). Once genuine lead and mercury are obtained, cultivation will bear fruit. The union of lead and mercury resembles the intercourse of heaven and earth, capable of refining the "Great Return Elixir" (an advanced Golden Elixir). When the elixir is perfected, treasures naturally manifest; all other paths are deviations.

The truths left behind by ancient realized beings are now withheld by those who understand them. During alchemical refinement, luminous transformations with multicolored radiance will appear. After ten months (symbolizing the alchemical cycle) of gestation, one undergoes a complete metamorphosis, astonishing all who witness it. Those obsessed with worldly wealth and status—what remains after a hundred years but dry bones? Why squander this fleeting time? Yet when these truths are explained in detail, people respond with doubt and slander.

Observe the dust of travelers coming and going between north and south, accumulating over millennia into mountains. The cycle of life and death in the bitter sea of existence is like endless waves. Even the palaces of ancient emperors now lie in ruins. During alchemical refinement, the white liquid (a preliminary product) in the furnace gradually transforms into yellow sprouts (an advanced product). Recall the initial difficulty of seeking mercury in its fluid state—when the yang fire reaches its peak and shifts to yin, as the fire wanes, yang energy gathers, naturally forming yellow sprouts. Consuming them grants longevity.

A detailed account of the refinement process: In the first month, the white liquid begins to congeal like snow; in the second month, it resembles melting butter gradually solidifying; in the third month, half-opened flower buds hang like pearls; in the fourth month, the yin and yang substances embrace like drops of blood; in the fifth month, the medicinal energy rises, emitting a murmuring sound; in the sixth month, it reaches the Purple Palace (Dantian, the energy center), where yang energy becomes complete; in the seventh month, it receives yin energy, causing hands and feet to grow cold; in the eighth month, the rudiments of internal organs begin to form; in the ninth month, it condenses into a pearl-like form with "hair" (crystallized medicinal energy); in the tenth month, mother and child separate (the elixir matures). At this point, the "mother" is exhausted, and the "child elixir" is perfectly formed, white as jade. After impurities are removed, the lead becomes pure white like snow, yet it must still be nurtured in the furnace to achieve perfection. When removing it from the furnace, follow the proper techniques to eliminate toxicity. This elixir is like a fetus in the womb—pure essence gradually shapes its form, growing in distinct stages.

The key to cultivating the Golden Elixir (Daoist Neidan practice) lies in mastering the transformation patterns of Yin-Yang. Just as nurturing the "yellow sprout" (a Neidan term referring to nascent primordial Qi) requires unremitting effort that must not be abandoned midway, ingesting the Golden Elixir can prolong life, restore black hair to the aged, yet more importantly, it serves to aid the impoverished. Only those with benevolent De (Virtue) who receive authentic transmission can merge with the Dao—this is a karmic bond forged through past cultivation.

Transmitting the Elixir Path demands exceptional caution. Imparting it to those with unvirtuous intentions invites calamity instead. The workings of creation (natural cosmic laws) are profoundly mysterious and should never be casually revealed. Ancient sages long warned: reckless transmission of alchemical methods brings ancestral retribution. The wise and perceptive naturally comprehend its profundities. Today we establish this covenant to admonish future practitioners: extreme Yang births Yin (Fu hexagram), extreme Yin births Yang (Gou hexagram). The alchemical furnace (symbolizing cultivation) resides at the central position of Wuji Earth (the Five Phases' soil element), where crucible and vessel unite above and below—one must steadfastly guard the Qi to prevent dissipation.

Observing the firing process requires seizing the opportune moments of Yin-Yang waxing and waning, like the mutual pursuit of dragon and tiger (symbolizing mercury and lead). When cultivation reaches the stage of the "infant" (metaphor for Neidan accomplishment)—serene, pure, with childlike complexion—it resembles how a nursing mother grows thin, requiring balanced Yin-Yang nourishment. The Qian hexagram represents extreme Yang, Kun extreme Yin, while the Four Symbols and Five Phases (Lesser Yang, Greater Yang, Lesser Yin, Greater Yin with Metal, Wood, Water, Fire, Earth) form the gateway to transformation. Among the sixty-four hexagrams, the Dun hexagram (symbolizing retreat for cultivation) holds supreme honor—the dragon and tiger devouring each other signifies Yin-Yang union.

Water and Fire serve as intermediaries to coalesce Shen (spirit). The dual Qi of Yin-Yang gestates the elixir embryo, just as one comprehends day-night alternation. Following the progression of eight solar terms (major divisions of the twenty-four solar terms), through cold-warmth transitions, the yellow sprout gradually grows. The sun and moon's motion propels Qi circulation, akin to remembering maternal kindness, ultimately crystallizing the Golden Elixir that opens immortality's gate. This method demands reverent secrecy—never discuss it lightly, as worldly people often mock its profound mystery. Never display this divine medicine (Golden Elixir) to ordinary eyes, lest it invite slander. The path of longevity transmits only to sages—heaven naturally records the names of those attaining the Dao.

Regarding precautions for ingesting the Returned Elixir (perfected Golden Elixir): Before taking the elixir, purify the heart-mind through breath regulation and Qi refinement, maintaining ritual purity and self-reflection while visualizing true deities. The Director of Destinies (deity governing lifespans) descends to inspect, and the Elixir Attendant (immortal youth overseeing medicines) examines one's sincerity. Never approach this with laxity—only meticulous care yields resonance. Post-ingestion, one might experience warm throat itchiness, chest discomfort, or foul meat-like odors in the mouth—these indicate the heart-viscera opening to expel turbid Qi. Licorice root may be held to alleviate symptoms. After five days, mental clarity emerges with harmonized genuine Qi. Sometimes special sensations manifest around the waist and navel—all normal elixir responses.

This passage describes the various detoxification reactions and psychosomatic transformations that occur after ingesting elixirs during cultivation practice. When the elixir begins taking effect, the body expels various impurities—such as abdominal gurgling, elimination of parasites, discharge of purplish-black blood clots, or mucus and pus resembling toad shapes. These reactions indicate the elixir is purging accumulated chronic ailments and toxins from the body.

After taking the medicine, various discomforts may arise: food stagnation causing chest oppression and nausea, vomiting sour fluids with loss of appetite, stiff limbs with restlessness, and even mental confusion or inexplicable fears. Strange dreams may occur—falling from heights, witnessing battlefield clashes, encountering tigers/leopards/snakes/insects, dreaming of deceased relatives or being chased by enemies. These manifestations stem from disturbances by the "Three Corpses" (道教认为人体内三种害人的邪神), requiring emotional stability and moderation of emotional extremes.

As cultivation deepens, further bodily changes emerge: slight throat pain, swallowing difficulties, abnormal urine coloration, diarrhea with pus and blood—all signs of accumulated wind-damp pathogens being expelled. Some may experience gum bleeding or sores, indicating the medicine's potency reaching deep into bone crevices. When limbs feel fatigued, it signals the elixir's activation; while smoother skin shows the medicinal Qi (气) has integrated with the body.

In advanced stages, remarkable improvements appear: heightened visual/auditory acuity, persistent metallic taste (signaling tooth renewal), hair regrowth, bodily lightness, and rejuvenated skin/bones. One year of practice fills the body with vibrant Qi (气); two years unblocks blood vessels; three years strengthens sinews and bones. These transformations demonstrate the elixir's miraculous effects gradually manifesting, aiding practitioners in achieving spiritual and physical rebirth.

The effects of cultivating the Golden Elixir (Jindan) are truly miraculous: it strengthens bones and marrow, fills the sinews and vessels, and bestows a rosy complexion like that of an infant. Excrement loses its foul odor; hands and feet become light and nimble, while the intestines grow resilient. Neither cold nor heat can harm the practitioner, nor can blades or weapons injure them. They cannot drown in water and walk through fire as if through empty space. Lost teeth regrow, white hair turns black again; the body becomes so light it seems ready to fly, and one moves swiftly as the wind. Hunger and thirst vanish, and one naturally abstains from the Five Grains. Unaffected by seasonal extremes, one transcends the mundane. All malevolent spirits dare not approach, while mountain and river deities come to pay reverent homage.

For those under fifty, taking the Golden Elixir for one year preserves the youthful appearance of one in their late twenties. Those over fifty who take it for two years regain a rosy complexion even at sixty or seventy. At the pinnacle of cultivation, one sheds the yin-turbid physical form, achieving a body of pure yang (Chunyang) that endures as long as heaven and earth. To ascend to the celestial realms, one must first abstain from grains for a year; a single dose of the Elixir then enables flight through the skies. Those not yet ready to ascend may first become terrestrial immortals (Dixian) in seclusion. After a day of purification and fasting, taking the Elixir allows one to continue worldly life—marrying, bearing children, or serving as an official—without hindrance. When ready to ascend, another half-dose taken after fasting enables cloud-riding or crane-mounted flight in broad daylight. The Elixir can also transmute metals into treasures and transform chickens or dogs into phoenixes and dragons upon ingestion.

Yin Zhenjun (a renowned alchemical patriarch) noted that while methods for cultivating the Golden Elixir number in the hundreds, the essence lies in the "Divine Water and Flower Pool" (the Dantian's qi sea) and the "River Chariot Circulation" (Zhou Tian techniques). True adepts understand that despite thousands of alchemical approaches, the core principles are contained in just two classics: the Golden Jade Scripture (Jinbi Jing) and the Triple Unity Concordance (Cantong Qi). Mastery over lead and mercury (the yin and yang qi) leads to the supreme achievement of the Golden Elixir. Yet one must discern true lead and true mercury (primordial qi)—without this, success is nearly impossible. Practitioners must widely seek enlightened masters with humility; pride and complacency inevitably lead to failure.

An ancient alchemical verse states: "White mercury (original spirit, Yuanshen) gives birth to cinnabar; black lead (original essence, Yuanjing) transforms into yellow sprouts (the nascent form of the Elixir)." The process requires eighty-one transformations before the Three Flowers (essence, qi, and spirit) converge at the crown. At the Purple Sun Palace (upper Dantian) stage, even gold pales in value. Yet only through the union of the Golden Lord (lead) and Wood Mother (mercury) can the Golden Liquid Returning Elixir (Jinye Huandan) be forged. Even without reaching the highest attainment, refining the Golden Elixir alone yields a marvelous longevity elixir. But remember this: lead (original essence) alone can never suffice.

This passage explains the key processes and principles of Waidan (external alchemy), the Daoist practice of creating longevity elixirs through mineral compounds. It begins by describing how true lead (symbolizing original Jing/essence in alchemical terminology) must be completely dissolved into mercury (representing original Shen/spirit), with all impurities filtered out before consumption. The "yellow sprouts" mentioned refer to golden substances produced during the alchemical process, symbolizing the elixir's quintessential essence.

The author draws a herbal analogy: while plants like Solomon's seal can prolong life, excessive consumption of toxic vines proves fatal. This illustrates how nature inherently contains both life-extending and lethal substances, thereby confirming the existence of pathways to longevity. However, ordinary people seldom encounter authentic immortal techniques due to their limited spiritual merit.

The scripture ultimately emphasizes that true alchemical mastery lies in harmonizing "true lead and mercury" (representing the fundamental Yin-Yang energies within both the human body and nature) and achieving "divine talisman white snow" (the pure Yang Qi manifested as white crystalline formations during refinement). The so-called "dragon-tiger union" (where dragon symbolizes mercury/Shen and tiger represents lead/Jing) denotes this perfect fusion of energies - the essential key to obtaining the reverted elixir of immortality. Yet the text reminds us that such celestial methods never reveal themselves casually to ordinary seekers.

The cultivation of the Golden Elixir (Jindan), the highest alchemical attainment in Daoism, hinges on penetrating comprehension of the mysteries of Yin-Yang transformation and mastery over the laws of natural creation. One must grasp the subtle principles of mutual generation and restraint among the Five Phases (Wood, Fire, Earth, Metal, Water), particularly understanding the profound interaction between Metal and Water. The process requires gathering the Primordial Qi (Xiantian Yiqi), the cosmic foundational energy, as the basis for alchemical work, using Heaven (Qian) and Earth (Kun) as the alchemical cauldron, while employing Kan (Water) and Li (Fire) from the Eight Trigrams (Bagua) as the medicinal ingredients.

Kan and Li represent the movements of sun and moon: The sun symbolizes Yang containing Yin, with the three-legged golden crow (solar deity) residing within, corresponding to the Li trigram—outwardly strong Yang concealing inner soft Yin, like cinnabar containing Wood's essence (Jing), associated with the Azure Dragon direction. Through the art of inverting the Five Phases, one can make the dragon emerge from fire—this is the "father's essence" (alchemical term for Yang quintessence). The moon embodies Yin containing Yang, with the jade rabbit dwelling within, corresponding to the Kan trigram—outwardly yielding Yin harboring inner firm Yang, like black lead containing Metal's essence, associated with the White Tiger direction. When the Five Phases follow their natural sequence, the tiger is born from water—this is the "mother's blood" (Yin quintessence).

The true alchemical materials are: the father's essence refers to true mercury (pure Yang Qi), concealed within cinnabar; the mother's blood refers to true lead (pure Yin Qi), hidden within black lead. These two represent authentic Yin and Yang: authentic Yin is the mercury within the Li trigram, while authentic Yang is the lead within the Kan trigram. When solar and lunar essences unite, they spontaneously generate true lead—the very foundation of elixir-making. Genuine lead isn't extracted from ore, but must be obtained from cosmic energies.

The mutual generation of lead and mercury resembles the mother-child relationship: lead produces mercury sprouts, which in turn generate lead. Mastering this transformational principle enables mercury to manifest myriad changes. Ordinary people often mistakenly use tangible substances like the five metals, eight minerals, or plant ashes for alchemy—these are all products of conditioned existence, fundamentally different from mercury (the core alchemical material). Mercury concentrates the essence of heaven and earth, the spiritual energy of sun and moon, distinct from common minerals. Thus it is said: Formed substances cannot serve as alchemical partners; only when the formless takes form does one achieve the true Reverted Elixir.

Since ancient times, mercury has been considered the most difficult substance to tame, yet when refined into purple powder through the River Chariot (Zhou Tian circulation method), it transforms into the Golden Elixir. Authentic Golden Elixirs require specially crafted vessels—no ordinary metal, mineral, or earthenware can accomplish this sacred work.

This scripture expounds the core principles of Daoist alchemy, focusing on the "cauldron" (alchemical furnace), "lead and mercury" (fundamental substances), and "Kan and Li" (the Yin and Yang energies).

The foundation of alchemy lies in the harmonious union of Yin and Yang. The cauldron (vessel) and the medicinal ingredients are ultimately one. The so-called "yellow sprout" (embryonic form of the elixir), while not identical to lead itself, cannot manifest without lead's catalytic function. However, this lead is not ordinary metal but "true lead" (primordial Qi). To abandon true lead would be as absurd as discarding one's parents while expecting to obtain their child.

The crux of alchemy involves mastering the interplay of Yin and Yang: red lead (Li trigram, representing Yang) and black lead (Kan trigram, representing Yin). When these two are harmonized within the cauldron through precise fire regulation, one can obtain in brief time the quintessence that nature requires millennia to produce. The relationship between mercury and lead resembles that of death and life—mutually constraining yet interdependent. Only when pure lead and mercury unite can the elixir be perfected; any adulteration will guarantee failure.

The pairing of Yin and Yang mirrors conjugal union: mercury represents Yin while lead embodies Yang. Using "true earth" (harmonizing Qi) as the golden cauldron (alchemical environment), through prolonged refinement the elixir reaches maturity. The perfected elixir manifests as violet-gold, containing the essence of the Five Phases. When ingested, it transforms base mercury into gold (symbolizing bodily transmutation), ultimately achieving longevity and ascension to immortality.

The poem "Wang Jiangnan" depicts the elixir's maturation: when the cauldron opens in the tenth month, the pill glows crimson like frost-touched gemstones, exuding extraordinary fragrance. The "Song of Attaining the Dao" emphasizes cultivating one's internal Five Phases (corresponding to qi, blood, bones, and flesh) rather than mistakenly pursuing external substances. True longevity lies in mastering the "Li palace" (heart fire) and recognizing mercury's (original spirit) true nature. Without authentic transmission, all efforts prove futile.

The scripture reveals the essential method of Neidan (internal alchemy): by harmonizing one's Yin-Yang energies and understanding the generative-destructive cycles of the Five Phases, one refines the elixir of immortality within the body. Concepts like lead-mercury and Kan-Li serve as metaphors representing the primordial Yin and Yang energies within human physiology.

This passage discusses common misconceptions in refining the Golden Elixir (Jindan, the highest attainment in Daoist cultivation) and the proper application of lead and mercury (alchemical terms symbolizing yin and yang qi).

Many mistakenly believe "yellow sprouts" (huangya, an alchemical term denoting nascent yang qi) refers to medicinal substances created from lead and mercury. In truth, authentic yellow sprouts aren't external materials but the crystallized essence of internal jing (essence) and qi. Obsession with external substances like gold is futile. The true path of cultivation reveals that lead (symbolizing original essence) is fundamentally the "golden male" (jinshi, representing original spirit). The original spirit requires original essence to manifest, yet excessive pursuit of the spirit leads to losing one's fundamental nature.

The text uses metaphors to explain cultivation principles: "flowing pearls" (a term for mercury) resemble the "charming maiden" (symbolizing yin) that scatters when encountering fire. Yet when meeting the "golden male" (symbolizing yang), they naturally unite. The mutual transformation of yin and yang qi ultimately returns to the central spleen-earth (the state where "three flowers gather at the summit"). When cultivation reaches the Purple Sun Palace (upper dantian), one perceives the radiance of the Golden Elixir. However, fixation on superficial changes of yellow sprouts obstructs true perception of the immortal path.

The genuine Golden Elixir medicine doesn't consist of worldly substances like mercury or black lead, but lies in grasping the true meaning of yin-yang. Just as lotuses don't grow on flat ground, alchemy requires finding the authentic root. The interplay of yin and yang centers on kan (water) and li (fire), like the sun and moon corresponding to dragon (liver qi) and tiger (lung qi). Many know these terms without understanding their essence.

The correct cultivation method involves: directing the "wood essence" (liver qi) to rotate leftward from the xun (southeast) to qian (northwest) positions, ultimately returning to the central palace. Cinnabar and mercury both belong to yin—like two women who cannot harmonize. Authentic lead and mercury aren't ordinary substances but the refined essence of yin and yang qi. The "great yin" (moon) resides in the south while the "great yang" (sun) dwells in the north. The yang-containing mercury (original spirit) must receive metal qi (original essence) to form true cinnabar. Yang within yin generates metal; yin within yang creates mercury-sand—this is nature's spontaneous transformation.

The key to cultivation lies in balancing yin and yang (the "two crescents" representing moon phases that symbolize equilibrium). Ultimately, all three vehicles (higher, middle, and lower grade elixir methods) aim to unify the body's three dantian energy centers. Without guidance from an enlightened master, even expending vast resources brings no attainment.

This passage elucidates the core principles of Daoist alchemy. The west corresponds to metal (represented by the Kan trigram symbolizing water), the south to fire yet also conceals the Kan trigram, the east to wood, while the north generates metal. Before metal and fire differentiate, all transformations originate from water. The text employs numerical symbolism for the Five Phases: metal's number four is called Wu-earth, fire's two and wood's three are termed Ji-earth. When Wu and Ji combine at the center, perfect balance between Yin and Yang is achieved.

When the numbers three and five unite, golden-white and purple radiance manifests. After ninety days of cultivation, the Reverted Elixir (elixir of immortality) can be perfected, preserving eternal youth. At ten months of refinement, the transformation resembles a fetus undergoing rebirth, astonishing even spirits and ghosts. This elixir requires neither external pursuit of the "river chariot" (Neidan term for vital essence circulation) nor the "flowery pool" (saliva), surpassing ordinary materials like the "eight minerals and four sulfurs." Just as jackals dare not approach thoroughbreds, or thorns compare to evergreen pines and osmanthus, the formless elixir born in the alchemical cauldron transcends worldly gold and silver.

Successful refinement enables ascension to the celestial Purple Mansion (abode of immortals). Alchemy demands proper coordination between sovereign and minister (lead and mercury), husband and wife (Yin-Yang), with like-minded practitioners collaborating for success. As all rivers return to the ocean, or dark rooms require lamps for illumination, cultivation must seize timely opportunities—like spring wind overnight blossoming peach and plum trees.

Reject worldly splendor, for the crucible contains miraculous elixirs. Life is fleeting, youth transient, wealth ephemeral—better emulate Prince Huainan (Han dynasty immortal) in perfecting the elixir, ascending with chickens and dogs. Mortals chase trivialities, using orpiment to fake elixirs from copper, ignorant that true divine medicine enables celestial ascent.

The spiritual elixir needs no mundane ingredients—metal-water mutual generation alone accomplishes creation's work, granting existence like the immortal toad in the moon. Heaven-earth's profound mechanism is evident, yet deluded minds remain unawakened. Sudden enlightenment of the true Dao requires devoted cultivation without discouragement. The Reverted Elixir's essence is returning to the origin—without this return, it's no true elixir.

As piled stones won't form waves, nor pooled water become mountains, how can one fish without nets? Practitioners—whether recluses or city-dwellers—must never abandon cultivation's true meaning.

(Note: While brilliantly expounding profound principles, this passage omits specific fire-phasing techniques.)

This passage describes the alchemical process of crafting the "Bliss Pill" in Daoist external alchemy (Waidan), vividly revealing the mysteries of this practice.

The preparation requires two key materials: Celestial Wood (representing Yang wood-element herbs) and Earthly Metal (symbolizing Yin metal-element minerals). The alchemist holds the materials in the left hand while manipulating them with the right. When the two substances meet, they swiftly fuse. The herbs are then placed in a crimson mortar and repeatedly ground until they form a wish-fulfilling treasure pill. Initially, the material is only the size of a copper coin, yet through repeated refinement, it miraculously expands to the size of a fist—a transformation that inspires awe.

During the process, two crucial substances emerge—one red, one black (symbolizing the two Qi of Yin and Yang)—which must be carefully preserved. When the elixir takes on a snow-white, crystalline luster, resembling a luminous pearl, it has reached the ideal state. To prevent the medicinal potency from dissipating, the pill is then placed in the furnace for calcination, with mercury (a common material in ancient alchemy) poured over it. Upon opening the furnace, radiant light bursts forth, signaling the need for further pounding until the mixture becomes increasingly viscous and firm.

The entire process strictly follows celestial timing: ten months and thirty hours (corresponding to the cosmic cycle), with the fire intensity regulated according to the transformations of the hexagrams. The elixir embodies the laws of heaven and earth, and consuming it grants the blessing of longevity. However, one must take care—the greatest taboo in alchemy has always been exposure to wind, a principle unchanged since ancient times. The true elixir is never far from humanity, yet people often become lost in appearances, searching everywhere in vain.

Upon successful refinement, the pill—weighing sixteen taels—must be taken at a specific hour (the first moment of the Zi period, corresponding to the cosmic origin). This timing aligns with the 364 hexagram transformations. Swallowing it nine times with "true water" (the saliva generated through cultivation), the medicinal power travels through the "tower of nine gates" (the trachea) to the five organs, circulating through the meridians. This elixir not only cures existing ailments but also prevents future illnesses, possessing the miraculous effect of reversing aging.

After ingestion, a wondrous experience unfolds: the medicinal Qi descends to seal the Mysterious Pass (Dantian), while the body's true Qi begins to flow. The abdomen becomes illuminated as if by the sun and moon, revealing the injustices of the world. Consumption follows a six-stage progression, each phase governed by the lunar cycle. During this period, one must purify the mind, reduce desires, and practice secluded meditation in a quiet chamber for a full year. The body gradually becomes as strong as tempered steel, ultimately achieving the transcendent state of "black turning to white, white turning to red"—the true metamorphosis of body and spirit.

The Huan Dan Zhou Hou Jue (Elixir Refining Secrets for the Inner Alchemist) scripture primarily elucidates the essential principles and techniques of Neidan (internal alchemy) practice. The key to cultivation lies in unwavering resolve and mastery of the methods. The "Happy Pill" (a metaphor for the internal elixir) is described as snow-white in color; though its ingredients may be easily obtained, the true refining secrets are exceedingly difficult to acquire. Once the medicinal substances enter the body, they circulate through the blood vessels, and after three years of dedicated practice, the internal transformations of Yin-Yang (the "inner sun and moon") manifest within. The authentic Golden Elixir neither leaks nor dissipates—successful cultivation enables ascension to the heavens. However, these secrets are likened to the sacred bonds between father and son or ruler and subject, never to be carelessly disclosed.

The Jin Jing Ge (Song of Golden Essence) section emphasizes the necessity of rigorous effort in practice. The golden cauldron (referring to the Dantian, the body's energy center) resides in the lower abdomen, requiring the interaction of one's True Fire (original Qi) and True Water (essential fluids). When the energy within the cauldron begins to boil, it must be promptly gathered—this is the true Golden Essence (the nascent form of the Golden Elixir). Cultivation must be rooted in the essential energies of one's parents, with lead and mercury (symbolizing the body's Yin and Yang energies) as its foundation; only through the transformation of Yin and Yang can one attain the state of an immortal. Human spirituality depends on the physical form—when the body perishes, the spirit scatters. Only by refining the Golden Essence can life be preserved and longevity achieved.

The subsequent verses further elaborate: The Great Dao originates from the primordial, undifferentiated state of chaos (Xuan Xuan), the source of Yin and Yang. Those who grasp this truth may prolong their years, and when the Golden Elixir completes its ninefold refinement (repeated cycles of cultivation), they shed their mortal form for an immortal one. The mysteries of Neidan defy verbal transmission—one must seize the opportune moments of Yin-Yang creation and the movements of the sun and moon. Gathering the "medicinal ingredients" (collecting the body's essential energies) must occur at precise hours, and the "firing process" (the rhythm of cultivation) must be perfectly regulated. Lead (the genuine Qi of the kidneys) resides in the northern Kan position; when it encounters mercury (the spirit of the heart), the Jade Nectar and Golden Elixir are forged. At the culmination of practice, one receives the celestial summons and ascends to the immortal realms astride a phoenix.

This scripture elucidates the methods and experiences of refining the Golden Elixir (Jindan), divided into several sections:

The first section discusses the essential elements of alchemical practice: True Fire is indispensable for achieving the Golden Elixir; otherwise, all efforts are in vain. Lead (representing primordial Qi) must be combined with other materials through the mediation of the "Yellow Matron" (Huangpo, symbolizing harmonizing true intention), undergoing the process of "nine returns and seven reversions" (jiuhuan qifan, repeated refinement cycles) until it ultimately returns to the "Central Palace" (Dantian). Upon completion, the practitioner attains the ability to ride phoenixes like an immortal.

The second section describes the alchemical furnace and cauldron: The furnace originates from emptiness and can nurture the "Mysterious Pearl" (Xuanzhu, the Golden Elixir). The furnace aligns with the celestial Bagua (Eight Trigrams) above and terrestrial orientations below, guarded by the four directional symbols including the Azure Dragon and White Tiger. Precise mastery of the fire phases and celestial cycles is required until the Dantian brims with genuine Qi, manifesting the wondrous sign of "clouds beneath one's feet," which distinguishes the practitioner's level of attainment.

The third section expounds on the marvelous function of the "sword": Here, the sword refers to the practitioner's true intention or Yang Spirit (Yangshen), capable of soaring and transforming to vanquish Yin demons and malevolent forces. After midnight, when the "Luminous Pearl" (Mingzhu, the Golden Elixir) is gathered, divine light appears, ultimately enabling one to wield this "sword" and ascend to the celestial realms of the Three Pure Ones (Sanqing).

The fourth section emphasizes the critical importance of fire regulation: The crux of alchemy lies in mastering the timing of fire phases. Using "Xun Wind" (Xunfeng, breath) to refine the medicinal ingredients, distinguishing the roles of host and guest (Shen and Qi), and harmonizing the rhythms of Yin-Yang advance and retreat are essential. When the practice reaches perfection, one transcends worldly constraints.

The fifth section discusses the alchemical cauldron: The true cauldron (referring to the human body) is exceedingly rare to encounter and difficult to comprehend—the Yellow Emperor called it the "Mysterious Origin" (Xuanyuan). This cauldron embodies the creative transformations of Yin-Yang, appearing mundane yet concealing sacred realms within. Discovering its source is like observing the sun's reflection in water, corresponding to the positions of Geng and Xin (western metal phase). Ultimately, one must "cleave open the gates of the three surnames" (breaking through the boundaries of the three Dantian) to achieve true immortality.

The final passage describes the transformative stages of the elixir: From "black gold" (lead) to "white gold" (silver), then to "yellow gold" (gold), culminating in the supreme medicine. Within mystery lies deeper mystery—only through the dual cultivation of nature and life (xingming shuangxiu) can one attain the true form.

The text concludes with the signature of Tang Wu Daling Zhenren (Perfected Being), who recounts encountering the Green City Elder (Qingcheng Zhangren) during Emperor Xuanzong's westward journey (742–756 CE) at Mount Qingcheng, where he received alchemical instructions but failed to grasp them at the time. Later, during the Zhide era (756–758 CE) at Mount Song, he met the Elder again and mastered the crucial method of "Divine Water and Yellow Sprout" (Shenshui Huangya, alchemical terms for medicinal essences). Subsequently, he refined the elixir with fellow practitioners Zhang Qufei and Cheng Taixu. After ingestion, his body became light and vigorous, capable of aerial flight, experiencing the wondrous efficacy of the spiritual elixir.

This passage elucidates the essential principles of Daoist Neidan (internal alchemy) practice and the cultivation insights of Master Lü, the Immortal.

Regarding cultivation methods, several health-preservation approaches are mentioned: Some practitioners regulate breathing (tuna) to nourish Jing (essence), yet this method often leads to cold stagnation in the waist. Others control Qi circulation to refine true Qi, but this may damage the skin. The author observes that during one's prime years, the innate Yuanqi (true Qi) is most vulnerable to depletion. Once Jing and Qi dissipate, the Shen (spirit) scatters. Even those who preserve their primordial Qi from childhood and maintain physical activity can only attain lower-level practice, never reaching the realm of aerial ascension. The truly profound method combines internal and external cultivation: externally refining the "fire dragon" (symbolizing Yang energy) while internally circulating "golden essence" (representing the primordial spirit). Only through this integrated approach can one realize the immortal Dao.

The author recounts his 112-year cultivation journey—from the first year of the Zhide era under Emperor Suzong (757 CE) to the first year of the Qianfu era under Emperor Xizong (874 CE)—spanning twelve dynasties. Though diligent practice restored his youthful vigor, he still fell twelve years short of the achievements of elders Zhang and Cheng. Amidst the empire's turmoil, he encountered Zhongli Quan (one of the Eight Immortals) during his westward travels, lamenting how mortals remain mired in delusion.

The passage concludes with Master Lü's self-portrait eulogy: The vast Dao embraces heaven and earth, defying confinement to form; true Qi shakes the eight directions—who could capture its likeness? Though brush and ink outline an image, they convey but a ten-thousandth of its transformations. Authentic divine resonance resembles the moon over sea or spring's east wind—ineffable through mere artistry. The closing sigh resonates: Among the boundless human multitude, who truly comprehends the Dao's essence?

The terms "fire dragon" and "golden essence" are specialized Neidan terminology, symbolizing the body's Yang energy and innate vital essence respectively. The "three vehicles" denote hierarchical stages of practice. The text embodies the Daoist pursuit of longevity and mystical union with the Dao.