《修真十書鍾呂傳道集》Vol. 2

This dialogue records an exchange between the Daoist immortals Zhongli Quan and Lü Dongbin regarding the essential techniques for cultivating the water-fire (Yin-Yang) dynamics within the human body.

Zhongli Quan explains: The "dragon" within the human body does not refer to the liver, but rather to the Yang aspect called the "Yang dragon," which originates from the true water in the Li palace (the heart region). Similarly, the "tiger" does not indicate the lungs, but the Yin aspect known as the "Yin tiger," which emerges from the true fire in the Kan position (the kidney region).

Lü Dongbin inquires: For attaining longevity, one must cultivate the Golden Elixir (Jindan), which first requires gathering "yellow sprouts" (primordial Qi). To obtain these, one must locate the dragon and tiger within. Why is it said that the true dragon emerges from the Li palace while the true tiger arises from the Kan position, and how do water and fire coexist within these regions?

Zhongli elaborates in detail: The watery aspects within the body carry many poetic names - the Four Seas (sea of blood, sea of Qi, sea of marrow, and sea of water-grain), the Five Lakes (corresponding to the five organs' directions), the Nine Rivers (the winding small intestine), and the Three Islands (crown of the head, heart, and kidneys). The fiery aspects manifest as three types: sovereign fire (heart fire), minister fire (kidney fire), and commoner fire (bladder fire), all rooted in primordial Yang to generate true Qi. When true Qi gathers, health prevails; when it weakens, illness arises; and when it dissipates completely with the loss of primordial Yang, the spirit departs and death follows.

Lü Dongbin continues: The human body relies on a single spark of primordial Yang to sustain these three fires, yet they easily dissipate amidst the numerous Yin waters, struggling to flourish. How should one address this condition of weak Yang overpowered by strong Yin, where fire diminishes while water abounds, accelerating aging?

Zhongli further explains the precise locations of the Four Seas: the heart as the sea of blood, kidneys as the sea of Qi, brain as the sea of marrow, and spleen/stomach as the sea of water-grain. He details the positions and functions of the Five Lakes, Nine Rivers, and Three Islands - describing the small intestine's nine bends as the Nine Rivers, the crown, heart and kidneys as the Three Islands, with the Hua Pool located below the Yellow Court (Dantian). During specific cultivation stages, the essence of these bodily "waters" manifests as ambrosia and jade nectar.

This scripture primarily discusses the interaction and efficacy of "water and fire" (referring to heart-fire and kidney-water) in Daoist Neidan (internal alchemy) practice.

During cultivation, the jade nectar (saliva) produced in the mouth and the golden nectar (refined essence) can both be used to forge the elixir. Practitioners must master the firing process (huohou), first cultivating in the middle Dantian (the region around the Shanzhong point) before moving to the lower Dantian (the area below the navel). Through this practice, wondrous transformations occur in the body: the jade nectar and golden blossoms (essence produced through cultivation) can transform into the golden-white substance (Golden Elixir), while the clarified cream and sweet dew (refined essence) can be forged into extraordinary fragrances—all manifestations of "water's" efficacy.

When heart-fire ascends, it assists kidney-qi in generating true water; when kidney-fire rises, it combines with heart-fluid to produce true qi. These effects can, in minor applications, subdue demonic obstructions and dispel illnesses, while in major applications, refine the physical form and forge the Golden Elixir. When circulating the celestial orbit (Zhou Tian), true fire can incinerate the ordinary body; mastering the yang gate (semen gate) allows essence to return and nourish the brain. By regulating the qi mechanisms in the body's nine regions to nurture the yang spirit, and by burning away the Three Corpses (three malevolent spirits believed to reside in the body according to Daoism) to eliminate yin ghosts, practitioners achieve profound purification. True qi ascending can break through the Three Passes (key points at the coccyx, spine-joint, and jade pillow), while descending can wear away the Seven Po (seven yin spirits in the body). Refining form into qi enables effortless levitation, while transforming qi into spirit facilitates complete metamorphosis—all manifestations of "fire's" efficacy.

Lü Dongbin asked: "When beginning cultivation, I worry that insufficient fire and excessive water may lead to decline. Now hearing how water and fire possess such efficacy, how should one practice to make the deficient abundant and the weak strong?"

Zhongli Quan replied: "When yin qi diminishes to two eights (sixteen parts) and yang qi grows to nine threes (twenty-seven parts), the golden-light Golden Elixir will soon be forged. After seven returns (seven cycles) and nine restorations (nine sublimations), the immortal embryo will spontaneously manifest. True qi resides in the heart—the source of fluids; primordial yang resides in the kidneys—the ocean of qi. The bladder houses the people's fire (acquired fire), which operates continuously, while also serving as the treasury of fluids."

Lü Dongbin further inquired: "You mentioned how cultivating to increase yang and decrease yin allows the Golden Elixir to form and the immortal embryo to spontaneously transform—what precisely does this entail?"

Zhongli Quan explained: "The eight cun and four fen between human heart and kidneys mirror heaven and earth's positional relationship. The mutual generation of qi and fluid resembles yin-yang intercourse; the twelve double-hours of a day correspond to the twelve months of a year. The heart's fluids don't arise from nothing—they form when lung fluids descend into the heart. This descending-ascending cycle resembles marital relations, called 'the wife returning to the husband's palace.' The kidneys' qi similarly doesn't emerge spontaneously—it forms when bladder qi generates kidney qi. This upward movement from below resembles mother-child dynamics, called 'the husband returning to the wife's chamber.' Liver qi serves as the guiding force in this process."

This passage explains the generative principles of "True Water" (zhenshui) and "True Fire" (zhenhuo) in Daoist Neidan (internal alchemy) practice. The kidneys, associated with the Water phase, produce the primordial Qi known as "True Fire," while the heart, associated with the Fire phase, generates the vital fluids called "True Water." These two energies circulate and interact within the body:

Kidney Qi ascends from below to meet the heart's fire. After their interaction, the energy steams upward to warm the lungs. When the lung fluids descend, they carry the heart's fiery energy back to the kidneys. These fluids originating from the heart never dissipate, hence they are called "True Water." Similarly, when lung fluids descend bearing the heart's fire to the kidneys, the kidney water merges with the heart fire, causing the bladder's Qi to rise again from the kidneys. This primordial Qi generated by the kidneys never diminishes, thus earning the name "True Fire."

When True Fire emerges from water, it appears indistinct and elusive, as if barely perceptible. When True Water arises from fire, it manifests obscurely, nearly impossible to grasp. Lü Dongbin once asked: "Since these two substances are formless and intangible, what use are they even if found?" Zhongli Quan replied: "The ancient Daoist masters achieved enlightenment precisely through this fusion of water and fire, which generates 'Yellow Sprouts' (the embryonic form of the internal elixir). Accumulated sufficiently, this process crystallizes into the 'Great Medicine' (Golden Elixir) – the authentic Dragon-Tiger union."

Regarding the dragon-tiger symbolism: While the dragon (qinglong) properly belongs to the liver (Wood phase), in alchemical practice it manifests not from the liver but from the "True Water" of the Li Palace (heart). The tiger (baihu), though associated with the lungs (Metal phase), gestates within the "True Fire" of the Kan position (kidneys). The yang dragon symbolizes springtime and benevolence, corresponding to the liver; the yin tiger represents martial potency, corresponding to the lungs. This "inverted dragon-tiger" cultivation method exemplifies the unique yin-yang transformation theory in internal alchemy.

This passage explains the movement patterns of Yin and Yang Qi within the human body and the process of forming the Neidan (internal alchemy), which is the core objective of Daoist cultivation. According to Five Phases theory, the White Tiger represents the western direction, associated with the Metal phase (Geng-Xin) and autumn, symbolizing righteousness, and corresponds to the lungs in the human body. Though the liver belongs to Yang, it occupies a Yin position, while the kidneys belong to Yin but occupy a Yang position, creating an interwoven state of Yin and Yang.

Kidney Qi (innate vital essence) nourishes liver Qi, just as water generates wood in the Five Phases cycle. When kidney Qi is abundant, liver Qi naturally flourishes, causing the liver's pure Yang energy to ascend. The lungs belong to Yin but occupy a Yang position, while heart fluid (the essence transformed from Shen/spirit) nourishes lung fluid, similar to how fire overcomes metal in the Five Phases relationship. When heart fluid is sufficient, lung fluid is produced, and pure Yin fluid descends.

The liver's Yang energy can dissolve residual Yin energy in the kidneys, producing pure Yang energy that contains the "True One Water" (primordial essence). This subtle, barely perceptible state is called the "Yang Dragon." The lung's Yin fluid can dissolve residual Yang energy in the heart, with the pure Yin fluid carrying the "True Yang Qi" (primordial energy). This obscure, barely visible state is called the "Yin Tiger."

Under normal circumstances, ascending Qi and descending fluid struggle to merge. However, through specific cultivation methods: when the True One Water within Yang energy encounters Yin fluid, they naturally combine; when the True Yang Qi within Yin fluid meets Yang energy, they naturally gather. During practice, one must prevent kidney Qi from dissipating to extract the True One Water, and preserve heart fluid to collect the True Yang Qi.

Persistent cultivation yields these results: after one hundred days, the "medicine" (condensed essence, Qi, and spirit) takes form; after two hundred days, the "sacred embryo" (nascent Neidan) stabilizes; after three hundred days, the "embryonic immortal" (complete Neidan) reaches perfection. Ultimately, a pill-sized, vermilion elixir forms and permanently resides in the lower Dantian (three inches below the navel), granting longevity and vision, transforming the practitioner into an "earthly immortal" (a Daoist adept who has achieved cultivation success).

Patriarch Lü (Lü Dongbin) summarized: The True One Water within kidney-water-generated Qi is called the Yin Tiger, which combines when meeting Yin fluid; the True Yang Qi within heart-fire-generated fluid is called the Yang Dragon, which combines when encountering Yang energy. This follows the natural principle of like attracting like. Note that during Qi and fluid movement, the True One Water descends with the fluid to nourish the five organs, while the True Yang Qi ascends with Qi through the throat (the "heavy tower").

When water (representing kidney yin) flows downward with bodily fluids, the "Tiger" symbolizing true yin cannot unite with the "Dragon" representing true yang. As true yang qi ascends, the "Dragon" likewise fails to couple with the "Tiger." If Dragon and Tiger cannot unite, how can the Yellow Sprout (the primordial qi produced through yin-yang union in Neidan practice) emerge? Without the Yellow Sprout, how can the Great Medicine (Golden Elixir) be refined?

Zhongli Quan explained: When kidney qi (true yang) arises, it resembles the sun leaping from the ocean—no mist can obscure its radiance. At this moment, descending bodily fluids are like a sparse bamboo curtain, utterly incapable of blocking vigorous yang qi. When yang qi is strong, the body's True One Water (primordial jing) naturally becomes abundant. Conversely, when heart fluid (true yin) emerges, it's like winter's harshness withering all things—even exhaled warmth cannot withstand its chill. Here, ascending qi resembles an emerald curtain, equally powerless to restrain fluid movement. When bodily fluids flourish, the strength of upright yang qi becomes indeterminable.

Lü Dongbin asked: Since qi and fluids each arise in their proper time—when qi arises strongly, True One Water becomes abundant; when fluids emerge vigorously, upright yang qi grows powerful—why then is their waxing and waning so difficult to grasp?

Zhongli Quan replied: Kidney qi (yang) disperses easily—what's hard to accumulate is the True Tiger (yin). Heart fluid (yin) is difficult to consolidate—what flows away readily is the True Dragon (yang). Though countless alchemical scriptures discuss nothing beyond yin-yang, their most essential manifestation is Dragon and Tiger. Yet among ten thousand cultivators, barely one or two truly comprehend this. Some scholars memorize Dragon-Tiger theories yet understand neither the timing of their union nor the methods of harvesting. Thus through the ages, practitioners with white-haired diligence achieve only minor accomplishments. Rare are those transcending life and death across generations—the crux lies in failing to make Dragon and Tiger couple, to harvest the Yellow Sprout for refining the Golden Elixir.

In Chapter Nine ("On the Elixir Medicine"), Lü Dongbin further inquired: The Dragon-Tiger principle is now clear, but what of this so-called Golden Elixir Great Medicine?

Zhongli Quan expounded: The term "medicine" originally denotes substances that cure illness, while diseases are categorized as...

This scripture discusses three types of human illnesses and their corresponding treatments.

The first is "seasonal illness," caused by external factors like seasonal changes, exposure to wind-cold or summer-heat, overexertion, or irregular diet. Such ailments can be treated with herbal medicine—finding a skilled physician for proper diagnosis and medication will lead to recovery.

The second is "physical illness," referring to age-related degenerative symptoms such as weakened Qi (vital energy) and blood, or scattered Shen (spirit). Ordinary medicine alone can hardly cure these conditions fundamentally.

The third is "the illness of old age"—the natural process of aging leading to death. The text states that even the greatest physicians of antiquity who could "cleanse intestines and repair flesh" (perform surgery) or "replace skulls and reconnect limbs" (organ transplants) couldn't reverse aging or grant immortality.

Lü Dongbin asks: "Then is there truly no solution for aging and death?"

Zhongli Quan replies that there are two methods: "Neidan" (internal alchemy through cultivating Jing (essence), Qi, and Shen to achieve longevity) and "Waidan" (external alchemy involving elixirs). When Lü Dongbin presses for details about Waidan, their dialogue transitions into the subsequent discussion on alchemical practices.

The text particularly emphasizes the importance of balancing Yin-Yang in treatment: when Yang energy is excessive, cooling herbs are used; when Yin energy predominates, warming remedies are applied. The elderly generally fear cold, while the young tend to suffer from heat; obese people often have phlegm-dampness, whereas thin individuals accumulate indigestion; men's ailments frequently relate to Qi disorders, while women's illnesses often involve blood imbalances. Treatment must always address the specific condition by reinforcing deficiencies and reducing excesses.

This scripture records a dialogue between Zhongli Quan (one of the Eight Immortals of Daoism) transmitting the alchemical methods to Lü Dongbin. It recounts how in ancient times, the Exalted Primordial Lord brought cultivation techniques to humanity, teaching the cyclical patterns of heaven and earth along with the movements of sun and moon, thus giving rise to various alchemical texts in the world.

Guangchengzi (the teacher of the Yellow Emperor) once transmitted alchemical methods to the Yellow Emperor. Though the emperor practiced diligently between state affairs, he saw no results for a long time. Guangchengzi explained that the key lay in the true Qi and true water existing between the heart and kidneys, and the true Yin and true Yang between Qi and water. When these elements are properly harmonized, one can refine the precious Great Medicine (Neidan), just as supreme treasures lie hidden within ordinary ores.

The specific method involves using Mount Kongtong as the setting, with the human body's internal transformations serving as the model for refining the Great Elixir. Among all minerals, only cinnabar (from which mercury is extracted) is selected; among the five metals, only black lead (from which silver is extracted) is used. Mercury symbolizes the yang dragon, while silver represents the yin tiger. The heart's fire should glow as red-hot as cinnabar, while kidney water should be as deep and dark as lead. Precise control of firing times according to seasonal cycles is required, with monthly adjustments between civil and martial fires (gentle and strong heating). A three-tiered alchemical furnace must be constructed, each layer nine inches high, square on the outside yet round within, to resonate with the Qi of the eight directions and harmonize with the four seasons.

The golden cauldron (alchemical vessel) containing lead and mercury resembles how bodily fluids are stored in the lungs. Adding sulfur to blend with spiritual cinnabar (elixir) is like the matchmaker (Yellow Dame) facilitating the union of yin and yang. Three years of cultivation brings minor achievements in curing ailments; six years yields intermediate results of extended longevity; nine years of complete mastery enables effortless ascension—crossing thousands of miles as easily as a warrior stretches his arm. Though one may not reach Penglai's immortal isles directly, earthly immortality becomes attainable.

Lü Dongbin asked: "Since ancient times, countless have practiced alchemy—why are successes so few?" Zhongli Quan replied: "Three causes lead to failure: first, inability to discern genuine materials; second, ignorance of fire regulation..."

This passage discusses the three main reasons for failure in Waidan (external alchemy, the practice of creating longevity elixirs through mineral and herbal preparations). First, precious ingredients may turn to ashes due to improper fire control, wasting both time and materials. Second, even with superior ingredients, one might lack knowledge of temperature regulation, or understand the firing techniques but possess inferior materials—without proper coordination between the two, the elixir cannot be perfected. Third, even with suitable materials and firing methods, errors in calculating the proper timing or insufficient personal De (Virtue/Power) may cause a successfully refined elixir to vanish before consumption, leaving the practitioner empty-handed.

The text emphasizes that high-quality ingredients are the concentrated essence of heaven and earth, and alchemy itself is a method of cultivation practiced by immortals. In ancient times, during the era of the Three Sovereigns, even the Yellow Emperor had to refine his elixir through nine cycles of transformation. After the Five Emperors, even the Primordial Patriarch required three years to complete the process. By the chaotic Warring States period, the world was filled with baleful Qi (vital energy), making it difficult to find superior ingredients. Even if someone possessed the alchemical formulas, they were often lost due to reclusive lifestyles. If such materials were readily available in the mortal world, why would the First Emperor of Qin send expeditions overseas in search of them? If the formulas were so easily obtained, why would Wei Boyang (an Eastern Han alchemist) painstakingly study the "Zhouyi" (Book of Changes)? Those with only superficial knowledge mislead later generations, causing countless people to exhaust their fortunes in vain.

Lü Dongbin (one of the Daoist Eight Immortals) raised doubts: although Waidan was transmitted by Guangchengzi (the Yellow Emperor's teacher), even a successful elixir required nine years to refine, with rare ingredients and hard-to-obtain formulas. Moreover, consuming such an elixir only granted temporary ascension, not true transcendence or flight to the immortal isles of the Ten Continents. He then turned his inquiry toward the mysteries of Neidan (internal alchemy, the practice of cultivating an inner elixir through self-refinement).

Zhongli Quan (Lü Dongbin’s teacher) replied that Waidan was not entirely useless, but those who awaken to the Dao late in life often lack a solid foundation. Just as a tree with shallow roots cannot grow lush foliage, a mind with an impure source cannot sustain the long-term circulation of Jing (essence) and Qi. Here, the tree’s roots symbolize the kidney Qi (life energy) in the human body, while the water source represents the Shen (spirit), emphasizing that cultivation must begin with strengthening these fundamental elements.

This passage discusses the distinction between "Neidan" (internal alchemy) and "Waidan" (external alchemy) in Daoist cultivation. It first notes that through prolonged refinement of the "five metals and eight minerals" (referring to various mineral-based medicinal substances), one can produce nine grades of Dragon-Tiger Elixirs (Waidan). While these may assist cultivation, it's absurd to obsess over external elixirs as a means to ascend to heaven through ingestion.

The core explanation focuses on Neidan principles: the "medicinal ingredients" for internal alchemy (the essential Jing, Qi, and Shen) are inherently present within every human body. The heart and kidneys serve as the foundation of these internal ingredients, as naturally occurring as common phenomena between heaven and earth. Practitioners must master the "fire times" (the precise timing and intensity of practice), emulating the cyclical patterns of the sun and moon, achieving Yin-Yang harmony akin to conjugal union.

When the "sacred embryo" (nascent form of the internal elixir) takes shape, true Qi emerges, nourishing it like a dragon nurturing its pearl. Upon maturation of the "great medicine" (fully developed Neidan), the Yang Spirit (original Shen) can transcend the physical body like a cicada shedding its shell. The essence of Neidan lies in the "dragon-tiger congress" (the fusion of heart-fire and kidney-water) producing "yellow sprouts" (initial signs of elixir formation), which upon ripening differentiate into "lead and mercury" (original Jing and Shen).

Master Lü Dongbin explains: The Neidan's "dragon" (original Shen) originates from the Yang energy within the heart's (Li Palace) water, while the "tiger" (original Jing) stems from the Yin essence within the kidney's (Kan Palace) Qi. In Waidan, the mercury in cinnabar corresponds to the Yang dragon, while the silver in lead resembles the Yin tiger. But true Neidan lead and mercury emerge from dragon-tiger interaction.

Master Zhongli Quan further clarifies: Black lead (a Waidan ingredient) contains heaven-earth essences that produce silver, while cinnabar absorbs solar Qi to generate mercury. Combining silver and mercury can forge treasures. Yet the profound mystery of human Neidan lies in the primordial Qi contained within the fusion of parental essence and blood during conception, gestating in the womb—completing physical form in 300 days and achieving full Qi and perfected Shen in 5,000 days. This reveals Neidan's fundamental connection with the origins of life itself.

The human body is initially formed from Jing (essence) and blood, with the water element being the first to take shape. From the perspective of the five organs, when Jing and blood constitute the physical form, the kidneys are the first to develop. The water within the kidneys (referring to innate primordial Qi) is already latent at the moment of conception, as the innate true Qi passed down from one's parents resides hidden within the human kidneys. This is what is termed "Qian" (a Neidan term referring to the primordial Qi in the kidneys).

The primordial Qi generated in the kidneys transmits to the liver, and the liver Qi then moves to the heart. When heart Qi reaches its peak, it produces heart fluid, which contains pure Yang Qi, known as "Zhusha" (a Neidan term referring to heart fluid). Meanwhile, "Gong" refers to the pure Yang Qi contained within the heart fluid. The innate true water (Qian) from kidney Qi and the pure Yang Qi (Gong) from heart fluid attract and merge with each other, much like how lead and silver combine with mercury in an alchemical furnace to form treasures. Ultimately, this fusion takes shape within the Dantian (Yellow Court) as the nascent form of the internal elixir.

Lüzu (Lü Dongbin) asked: Among the five metals, silver can be extracted from lead, and among the eight minerals, mercury can be extracted from cinnabar. When these are placed in a crucible with medicinal substances, mercury can transform into cinnabar, and silver can be refined into treasures. But how does one extract "silver" from the "lead" within the human body? How does the "cinnabar" in the body yield "mercury"? How does "mercury" transform back into "cinnabar"? And how is "silver" refined into a treasure?

Zhongzu (Zhongli Quan) explained: The "lead" in the human body is originally the union of the parents' innate true Qi, pure and unadulterated. After taking form, it resides within the two kidneys, which face each other and jointly generate primordial Qi—this is the Yuan Yang Qi. Within this Qi lies water, called the True One Water. The water rises with the Qi; when the Qi stops, the water stops, and when the Qi disperses, the water disperses. Water and Qi are inseparable, like mother and child. Those skilled in observation can perceive the Qi but not the water. If this True One Water is combined with the pure Yang Qi of the heart, it is called "Dragon-Tiger Copulation" (a Neidan term referring to the fusion of Yin and Yang Qi), which gives rise to "Yellow Sprouts" (a sign of the initial formation of the internal elixir).

Using the Yellow Sprouts as the foundation for refining the Great Medicine (advanced internal elixir), the process fundamentally relies on the True One Water as the embryo, enveloping the pure Yang Qi within—much like how parents initially formed the embryo from Jing and blood. After 300 days of cultivation and transformation, the internal elixir becomes fully developed, like a fetus, with abundant spirit and Qi, and a complete form, ultimately achieving the unity of form and spirit. Through the interaction of kidney Qi and heart Qi, the True One Water within the Qi merges with the Shen (spirit), enabling the practitioner to attain the sublimation of life.

This passage elucidates the crucial process of transforming Jing (essence), Qi (vital energy), and Shen (spirit) in Daoist Neidan (internal alchemy) practice. The immortal masters Lü Dongbin (Lü) and Zhongli Quan (Zhong) discuss the profound mysteries of cultivating the Golden Elixir (Jindan).

The practice begins with the adept receiving pure yang qi, through which the interaction of yin and yang energies within the body creates an embryo-like state. Initially no larger than a millet grain, this embryonic form requires careful nurturing. The alchemical process unfolds in two phases: first, yin energy retains yang energy, then yang energy refines yin energy. Through sequential transformations—qi converting to jing, jing to mercury (representing the primordial spirit), mercury to cinnabar red, and cinnabar to elixir—the Golden Elixir ultimately coalesces. Upon its completion, authentic qi spontaneously arises. Further refinement of qi into spirit enables transcendence from worldly dust—like a fiery dragon bursting through mundane darkness, mounting a mystical crane to soar toward Penglai, the Isle of Immortals.

Lü inquires about gender differences in physical form and cinnabar coloration. Zhongli explains: During conception, if the father's jing enters before the mother's blood, a female embryo forms, manifesting inner yang and outer yin; if the mother's blood precedes the father's jing, a male embryo develops with inner yin and outer yang. Here "blood" signifies heart-fire qi, lacking pure yang energy, while "jing" represents kidney-water qi containing pure yang—the very root of mercury (primordial spirit). True cultivation requires guiding the "Water of True Unity" (primordial qi) into the Yellow Court (middle dantian), through the alchemical work of "lead" (kidney qi) and "mercury" (heart qi) mutually refining each other.

Lü further questions: The lead in kidneys generates primordial yang qi containing the invisible Water of True Unity. When mercury's pure yang qi refines lead, flourishing lead qi lifts this Water upward. But since mercury itself is pure yang qi, wouldn't further refinement with lead decoction risk excessive yin depleting true yang? Zhongli responds: When kidney qi and heart qi unite at their zenith, they produce saliva imbued with pure yang qi. Combined with the Water of True Unity, this constitutes the "Dragon-Tiger Copulation." The resulting supreme medicine of the Golden Elixir—mere millet-grain sized—can be safely conveyed to the Yellow Court for continued nurturing.

This passage explains the principle of "extraction and replenishment" (choutian) in Daoist Neidan (internal alchemy) practice. The so-called "Yellow Court" (Huangting) refers to a crucial area in the human body located below the spleen and stomach, above the bladder, north of the heart, south of the kidneys, west of the liver, and east of the lungs. This region contains clear energy above and turbid energy below, corresponds to the colors of the four directions, has a capacity of approximately two liters, and connects with the body's eight water channels. The alchemical substances (Jing-essence and Qi) cultivated through practice circulate within it day and night.

Practitioners must note: if one only gathers Jing-essence without applying the proper "fire phases" (huohou, the timing and intensity of cultivation methods), the essence will dissipate. Conversely, if one only applies fire phases without gathering essence, the Yang within Yin cannot stabilize, merely serving to boost kidney Qi and warm the lower Dantian (energy center). Authentic practice requires precise timing—one must first work with "lead" (referring to the primordial essence in the kidneys), using the movement of genuine Qi to consolidate the "great medicine" (the internal elixir). This method is called the "art of gathering and replenishment."

Specific techniques include: using primordial lead (innate vital essence) to extract essential energies through the practice of "flying the golden essence behind the elbows" (a specific Neidan technique). After extracting lead, one must replenish "mercury" (referring to the heart-mind); otherwise, it merely returns essence to nourish the brain without generating true Qi. After replenishing mercury, one must again extract lead—failing to do so means merely refining mercury to nourish the Dantian without transforming mercury into cinnabar, thus preventing the achievement of the Golden Elixir (Jindan).

Master Lü (Lü Dongbin) asked: "Gathering the medicinal substances requires relying on the water within Qi, while applying the fire phases depends on the Qi within lead. How does one truly extract lead to form the elixir?" Zhongli Quan replied: "When the ancient sages transmitted the Dao, they observed the patterns of Yin-Yang's ascent and descent between heaven and earth, the alternation of cold and heat through the four seasons, and the principles governing the sun and moon's movements through waxing and waning. Sadly, ordinary people fail to comprehend these natural patterns—like seeing only parts while missing the whole. Internal alchemy practice precisely emulates these celestial movements of sun and moon, mastering the timing for the ascent, descent, extraction and replenishment of essence and Qi."

This passage explains how people often fail to comprehend the principles governing heaven and earth, indulging in boundless desires while squandering their limited lifespan. Those lives of wealth and extravagance ultimately vanish like fleeting clouds. Affections, grudges, worries, and sorrows all eventually transform into karmic debts for future rebirths. Frequently, before the songs of revelry have ceased, suffering arrives prematurely; just as fame and fortune reach their peak, youthful vitality has already faded.

Many cling greedily to material possessions, believing they can possess them forever; they dote on descendants, hoping for eternal reunion. These covetous and deluded thoughts persist endlessly, with futile hopes for immortality, yet the result is only the dissipation of primordial yang (innate vital essence) and the leakage of true qi. Only when severe illness strikes do they finally pause, and only when death approaches do they consider restraint. The true immortals and sages pity humanity's cyclical descent, hoping people may grasp the true meaning of the Dao (the Way), enduring like heaven, earth, sun, and moon.

First, it clarifies the principle of yin-yang's ascent and descent in heaven and earth, then uses the movement of sun and moon as metaphor. Those who fail to understand celestial mechanisms or fathom the profound mysteries compare external elixirs (referring to mineral-based alchemical substances) to internal elixirs (referring to the body's essence and qi). In truth, the minerals (external elixirs) are devoid of sentience, while the qi and fluids (internal elixirs) possess vitality. Just as with heaven, earth, sun, and moon, both external minerals and internal qi-fluids must follow the laws of "gathering, supplementing, and refining"—these are the foundational principles of creation.

For example, after the winter solstice, yang qi rises while the earth absorbs yin qi, transforming the Great Yin into Jueyin, and increasing Lesser Yang into Bright Yang. After the summer solstice, yin qi descends while the heavens absorb yang qi, transforming the Great Yang into Bright Yang, and increasing Lesser Yin into Jueyin. This is the principle by which heaven and earth's yin-yang ascent and descent create six climatic phases, embodying the law of "refining and supplementing." Another example: the moon absorbs the sun's radiance, while the sun influences the moon's phases. During the first fifteen days of each month, the moon gradually absorbs the sun's light (refining its po soul), while the sun continuously provides energy (supplementing its hun soul), until lunar brilliance reaches fullness, illuminating the earth. This describes the transformation from new moon to first quarter moon, then to full moon.

This passage explains the correspondence between celestial movements and human cultivation practice. The moon's cyclical phases—from new moon (shuo) to full moon (wang) to dark moon (hui)—symbolize the waxing and waning of Yin and Yang energies within the human body. The first fifteen days of lunar growth mirror the ascendance of Yang qi in the practitioner, while the subsequent waning phase reflects Yin qi's gradual dominance. This natural rhythm embodies the principle of "extraction and replenishment" (choutian), describing the dynamic interplay of these complementary forces.

The immortal sages observed that worldly people primarily sought longevity and material wealth, thus employing the metaphor of Golden Elixir (Jindan) alchemy (Waidan) to illustrate internal cultivation (Neidan). In truth, authentic practice resides within oneself: the human body inherently contains "true Yang qi" (zheng yang zhi qi, the pure primordial Yang energy) and "authentic unity water" (zhen yi zhi shui, the kidney essence/Jing). By mastering the proper timing for Yin-Yang interaction and knowing when to gather these energies, practitioners can gradually refine qi into spirit (Shen), ultimately transcending life and death. This inner alchemy proves infinitely more valuable than pursuing external elixirs of gold and silver.

Ancient sages reluctantly used lead and mercury (Waidan ingredients) as metaphors for internal cultivation because they witnessed people's obsession with external alchemy. In reality, the human body itself serves as the alchemical furnace—where kidney essence (represented by lead) and heart-mind (represented by mercury) undergo transformative union, generating energy far more precious than any material gold. Daoist practitioners should understand this truth: rather than clinging to external alchemical methods, one must focus on inner refinement. The text's reference to "human lead" denotes the innate primordial qi we're born with—the fundamental energy that has existed since the dawn of creation.

This passage elucidates the core principles and concrete methods of Daoist Neidan (internal alchemy) practice. All things in existence originate from the most primordial substance (Taizhi), wherein water represents the pre-heaven Jing (essence). The metallic nature contained within water (true lead) and the aqueous nature within fire (true mercury) constitute the foundation of the Five Phases (Wood, Fire, Earth, Metal, Water) and the very source of the Dao.

The crucial practice lies in "extracting lead and replenishing mercury": lead (referring to the primordial essence in the kidneys) must be drawn upward from the lower Dantian (three inches below the navel), while mercury (referring to the heart-mind) naturally descends. This process doesn't involve external acquisition but rather internal circulation. The specific method involves elevating Jing (essence) and Qi (vital energy) from the lower Dantian to the upper Dantian (between the eyebrows) - this is called "flying the golden essence behind the elbow"; also termed "activating the river chariot to circulate the dragon and tiger," which essentially means circulating essence and energy through breath guidance; alternatively called "returning essence to replenish the brain" - only through this method can one achieve immortality.

When lead and mercury converge in the middle Dantian (heart region), they produce "yellow sprouts" (the nascent mother of elixir); through repeated lead extraction and mercury replenishment, one cultivates the "embryonic immortal" (rudimentary form of internal elixir). Without achieving the inversion of the Five Phases (reverse flow of essence-energy), the coupling of dragon and tiger (union of heart and kidneys), and the cyclical movement through the three Dantians, one cannot form a complete embryonic immortal.

Regarding cultivation timeline: in one hundred days the medicinal ingredients become complete, in two hundred days the sacred embryo stabilizes, and in three hundred days the embryonic immortal matures to generate true Qi. After true Qi emerges, one continues refining Qi into Shen (spirit). When the practice reaches completion, one undergoes physical transformation to become an immortal.

Ancestor Lü (Lü Dongbin) asked: "While lead and mercury from minerals can refine Waidan (external alchemy), how does one extract and replenish the pre-heaven true Qi (true lead) stored in the kidneys and the true yang Qi of heart-mind (true mercury) within the human body?" Zhongli Quan replied: "Initially, intentional guidance is required (using lead), but clinging to methods is ultimately mistaken. When true lead (primordial Qi) ascends into the brain, mercury (spirit) naturally condenses. When yin substance completely transforms into pure yang, the spirit undergoes transformation like cinnabar refining gold - this is the authentic 'true lead' emerging from the fusion of one's own vital energies."

When true lead manifests within vital energy, the Qi of the five viscera converges at the crown (facing the origin), and the three yangs (essence, Qi, and spirit) gather at the upper Dantian. Previously, golden essence (primordial essence) descending to the Dantian could refine the form and strengthen bones; now true lead ascending to the inner palace (middle Dantian) requires ten months of gestation-like cultivation. After a year of lead extraction and mercury replenishment, the body emits white light with essence and energy circulating continuously - all results of the repeated refinement of golden essence.

This passage explains the operational principles of the "River Chariot" (Heche), a metaphorical term for the circulation of genuine Qi in Daoist Neidan (internal alchemy) practice, as discussed by Patriarchs Lü Dongbin and Zhongli Quan.

Zhongli Quan elucidates that the movement of the River Chariot mirrors natural phenomena—clouds obscuring the sun, leaves floating on water, or tumbleweeds driven by wind—all manifestations of spontaneous cosmic operation. Ancient sages observed these patterns and conceptualized the "chariot" as an analogy for energetic circulation. Within the human body, this "chariot" doesn't traverse land but navigates through "water" (symbolizing yin energy).

The River Chariot's pathway within the body flows from the crown (Kunlun, representing the head) downward to the heart-kidney region (Phoenix Tower/Fengque), transporting primordial yang qi into the heart (Li Palace), then returning refined qi to the lower Dantian (Yellow Court). It perpetually cycles among the three Dantian (upper, middle, and lower energy centers), akin to the Golden Boy (Jinnan) delivering energy to the Niwan Palace (cranial chamber), while the Jade Nectar (saliva) completes a microcosmic orbit within half a day.

The River Chariot's function is pivotal: without its operation, the Five Phases' energies cannot manifest, and yin-yang qi cannot intersect. Practitioners must harness this circulation to achieve yin-yang harmonization and the cultivation of yang while refining yin. Just as the primordial cosmos required yin-yang interaction to coalesce, the River Chariot serves as the essential mechanism enabling this dynamic exchange.

Zhongli Quan particularly emphasizes precise timing in its operation: ascending when ascent is due, never descending prematurely; extracting when depletion is needed, never adding redundantly. Every upward and downward movement must be exquisitely calibrated—a feat accomplished solely through the River Chariot's impeccable regulatory power.

This passage elucidates the profound mystery of the "River Chariot" (Heche) in Daoist Neidan (internal alchemy) practice—a term referring to the cyclical pathway of genuine Qi circulation within the body. The River Chariot functions like a transport vehicle, conveying the interplay of Yin and Yang energies throughout the physical form.

In practice: When the authentic Qi from the kidney reservoir (corresponding to the Water phase in Five Phases theory) becomes activated, it follows a specific trajectory. Beginning from the northern Kan position (associated with Water in the Bagua/ Eight Trigrams), it moves through Gen (earth element), Zhen, and Xun (Wood phase) sectors, transporting Yin energy to the Li Palace (heart fire, Yang's domain). Conversely, when the Li Palace activates, the Qi travels through Kun (earth), Dui, and Qian (Metal phase) sectors, carrying Yang energy back to the Yin-governed Kan Palace. This reciprocal movement resembles a chariot transporting vital cargo between celestial regions.

Key cultivation techniques include: harvesting medicinal essences (Jing-Qi) from the Nine Palaces at the crown point before descending them to the Yellow Court (middle Dantian); extracting "lead" (kidney essence) from the Perineum's Crooked River and elevating it to the Inner Court (upper Dantian). The circulation of Jade Nectar (saliva) and Golden Elixir (essential Qi) refines the physical form by raising kidney water, while the movement of Sovereign Fire (heart fire) and People's Fire (gate of vitality fire) forges the elixir by directing heart fire downward.

When the Five Qi (energies of the organs) return to their origins and the Three Blossoms (Jing, Qi, Shen) gather at the crown, practitioners must employ true fire to purify the body and eradicate the Three Corpses (malignant thoughts). After refining the medicinal substances, one bathes in sweet dew to pacify internal fluids—all manifestations of the River Chariot's transformative power.

Ultimately, the River Chariot embodies the righteous Qi of northern kidney water. Its ceaseless revolutions bear the dual forces of Yin and Yang, playing a pivotal role in spiritual cultivation. This dynamic system mirrors the cosmic interplay between Heaven's rotations and Earth's stability, where the ascending and descending of water and fire achieves the alchemical union within the human microcosm.

This passage explains the sequential stages and states of attainment in Daoist Neidan (internal alchemy) practice through the "Three Vehicles" - Lesser River Cart (Xiao Heche), Greater River Cart (Da Heche), and Purple River Cart (Zi Heche).

Practitioners utilize the cyclical transformations of the Five Phases (Wood, Fire, Earth, Metal, Water) and apply the method of "Dragon-Tiger Copulation" (harmonizing Yin and Yang Qi) to refine "Yellow Sprouts" (the nascent elixir foundation) within the body. This constitutes the Lesser River Cart practice. Subsequently, through the "Flying Golden Essence Behind the Elbow" technique (a method for circulating vital energies), the practitioner sends the refined Jing (essence) and Qi to the Muddy Pellet Palace (upper Dantian). By "extracting lead and adding mercury" (adjusting the body's Yin-Yang energies), they forge the "Great Medicine" (advanced elixir), achieving the Greater River Cart stage.

When cultivation reaches the stage of abundant genuine Qi, with the "Five Qi's Returning to Origin" (the energies of five organs converging in the Dantian), and the Yang Spirit manifests while the Three Treasures (Jing, Qi, Shen) transcend the inner chambers (key energy centers), the practitioner forms the Purple Golden Elixir (highest level internal alchemy). Extraordinary phenomena appear at this stage: mystical cranes dancing, fire dragons soaring, golden light enveloping the body - all transcendent experiences. The adept gains freedom to leave the physical body at will, transcending mundanity to become a "Feathered Guest" (immortal). This represents the supreme achievement of the Purple River Cart.

The text also mentions three inferior "carts" representing unsuccessful cultivation: the Messenger Cart (using intention to guide Qi for healing), the Thunder Cart (hearing internal thunder during meditation), and the Broken Cart (where emotional desires deplete primordial Qi leading to aging and death). These serve as cautionary examples of failed practice.

When Lü Dongbin (Lü) inquired about cultivation progress from Zhongli Quan (Zhong), the latter explained: After comprehending the Dao of heaven and earth, one first harmonizes Yin-Yang, then gathers and disperses water-fire (regulating internal energies). Through "herb gathering" (collecting primordial Qi), "applying fire" (using focused intention to generate heat), and "extracting lead/adding mercury" (adjusting Yin-Yang), one completes the Lesser River Cart. When the Golden Essence ascends to the crown and the Great Medicine gradually forms, higher stages become accessible. The entire cultivation process must follow proper sequence - one cannot force premature attainment.