《金丹四百字》

The text explains the core principles of Daoist Neidan (internal alchemy) cultivation, using the theories of the Five Phases and Bagua (Eight Trigrams) to interpret the human cultivation process:

In the "Seven Returns and Nine Reversions Golden Elixir," the number "seven" represents Fire (Fire corresponds to seven in the Five Phases), while "nine" represents Metal (Metal corresponds to nine). This signifies using Fire (heart fire) to refine Metal (lung metal), returning Jing (essence) and Qi (vital energy) to their original source—the foundational principle of the Golden Elixir path.

Key cultivation practices include:

1. Dividing the body into upper and lower sections (upper and lower crescents), aligning Shen (spirit) and Qi with the winter and summer solstices, and harmonizing form and spirit with the Kan (Water) and Li (Fire) trigrams.

2. Matching the five organs to the Five Phases: Liver-Wood (Eastern Hun), Lung-Metal (Western Po), Heart-Fire (Southern Shen), Kidney-Water (Northern Jing), and Spleen-Earth (Central Yi). This is called "gathering and clustering the Five Phases."

3. Restraining the senses: eyes not gazing randomly, ears not listening indiscriminately, nose regulating breath, and tongue refraining from speech. This is termed "harmonizing the Four Symbols."

The crux of cultivation lies in internalizing Jing, Qi, and Shen:

• Hun (ethereal soul) remains in the liver without dissipating through the eyes.
• Po (corporeal soul) remains in the lungs without dissipating through the nose.
• Shen remains in the heart without dissipating through the mouth.
• Jing remains in the kidneys without dissipating through the ears.
• Yi (intent) remains in the spleen without dissipating through the limbs.

This is called "the Five Qi returning to the origin."

Advanced cultivation stages include:

1. Transforming Jing into Qi, Qi into Shen, and Shen returning to emptiness—known as "the Three Flowers gathering at the crown."

2. Fully merging Hun, Po, Shen, Jing, and Yi into the invisible and intangible primordial Qi, achieving the state of "emptiness."

Critical distinctions:

• Refining "primordial Jing" (innate essence), not the post-natal essence of desire.
• Refining "primordial Qi" (innate energy), not the breath of ordinary respiration.
• Refining "primordial Shen" (innate spirit), not the mundane consciousness of daily thought.

These primordial Jing, Qi, and Shen share the same origin as heaven and earth—their preservation brings life, their loss brings death. When tempered by Yang Fire (intent), they transform into Yang Qi; when nourished by Yin Fu (natural processes), they become Yin Jing.

The text concludes with metaphors:

• The body is the dwelling of the heart; the heart is the master of the body.
• The heart resembles a wild dragon; the body resembles a fierce tiger.
• The body contains true Yang Qi; the heart holds true Yin Jing.
• The heart belongs to Qian (Heaven); the body belongs to Kun (Earth)—together forming the "Qian-Kun cauldron."
• Yang Qi is like the sun (the crow); Yin Jing is like the moon (the hare)—collectively called the "crow-hare medicinal substances."

The ultimate goal of cultivation is the unification of Yin and Yang (embracing the One).

This scripture elucidates the core methods of Daoist Neidan (internal alchemy) practice, using metaphorical language to describe the alchemical process:

During cultivation, one must stabilize the central palace (Dantian) and gather the primordial Qi. This follows the cyclical rhythm of day and night (morning accumulation and evening refinement), circulating the celestial cycle according to the Zi (midnight) and Wu (noon) hours. At Mao hour (dawn) when Wood Qi flourishes, and You hour (dusk) when Metal Qi prevails, one should pause the firing process for "bathing" (rest and adjustment).

In practice, the dual energies of Yin and Yang (represented by Zhen's male and Dui's female) must harmonize like wind stirring Yang energy (Xun wind) and earth nurturing all things (Kun earth). At the initial stage of "gathering the medicinal substances" (collecting primordial Qi), one must mobilize the body's energy system (the bellows of Qian and Kun) to balance heart and kidney energies (the measuring spoon of Li and Kan). The process begins like mist shrouding mountains, progresses like moonlight reflecting on water, and ultimately achieves the harmonious union of Yin and Yang, akin to the intertwining of turtle and snake.

Practitioners may experience the "dragon-tiger battle" (conflict between Jing and Shen) or "crow-rabbit struggle" (interplay of Jing, Qi, and Shen). At this stage, true intention (the yellow matchmaker) must mediate to unite lead (primordial Qi) and mercury (original spirit) in the central palace. Precise regulation of the firing process is crucial—like cooking rice that must be neither too dry nor too wet.

At advanced stages, practitioners experience tangible sensations: cooling breeze at the crown (Niwan palace), luminous moonlight in the chest (Jiangong palace), warming fire in the lower abdomen (Dantian), with the whole body refreshed as if bathed and the spirit joyful like reunited lovers. These are not mere metaphors but actual experiences.

The text concludes with temporal calculations: ten lunar months (thirty thousand ke) of human cultivation equate to thirty thousand celestial years. Each ke moment of practice encompasses the seasonal transformations of an entire year. Through such sustained cultivation, one can crystallize the sacred embryo (Neidan) and attain the true immortal body.

(Note: Terms like lead-mercury, dragon-tiger, and crow-rabbit are Neidan metaphors representing the body's essential energies—Jing, Qi, and Shen.)

This scripture reveals the essential principles of Daoist Neidan (internal alchemy) practice. A year contains twelve months with thirty-six thousand shichen (ancient time units) - even ordinary people could attain transcendent states by harnessing each moment for cultivation. Yet most squander their vital foundations daily: primordial Jing (essence) dissipates, original Qi (vital energy) weakens, and innate Shen (spirit) scatters.

Practitioners must maintain constant mind-body harmony, as the slightest deviation wastes the alchemical materials (Jing-Qi-Shen) and disrupts the firing process (timing and intensity of practice). Thus, a hair's breadth of error prevents the Golden Elixir's completion. One should cultivate with steady focus without overexertion, allowing true Qi to condense naturally and Shen to strengthen spontaneously. Internal refinement resembles forging thirty thousand golden crucibles annually, while externally extending lifespan by thirty millennia. At its grandest scale, one completes thirteen thousand five hundred breath cycles daily; at its subtlest, circulating Qi through eighty-four thousand li of meridians in twelve shichen.

The key lies in gathering Yang energy between heaven and earth, absorbing the essences of sun and moon. Through uniting "lead" (symbolizing kidney essence) and "mercury" (representing heart-mind), practitioners form the "Jade Pool" (alchemical vessel) and "Divine Water" (refined essence). During practice, one must avoid these extremes: neither complete Wuwei (non-action) nor forced striving; neither empty speculation nor rigid formalism; neither barren sitting that wastes energy nor blind physical exercise.

Most crucially, practitioners must recognize the body's mysterious "Xuánpìn" cavity - not located among ordinary organs but serving as the root of Shen and Qi. This pivotal point requires direct oral transmission from master to disciple. The entire Four Hundred Character Golden Elixir Classic illuminates foundational principles, helping cultivators grasp essence while avoiding distraction by peripheral matters. Golden Elixir practice ultimately creates substantial being from emptiness, nurturing the inner alchemical infant (symbolizing perfected Neidan).

This passage elucidates the essential principles of Neidan (internal alchemy) practice, using metaphorical language to describe the cultivation process of Jing (essence), Qi (vital energy), and Shen (spirit).

The opening section cautions practitioners against rigidly clinging to literal interpretations that may lead them astray. The Golden Elixir (Neidan) emerges from emptiness, yet this "void" is not mere nothingness but a dynamic vacuum brimming with generative potential.

The text then explains the alchemical process through the interactions of the Five Phases (Wood, Fire, Earth, Metal, Water):

• True Earth (the Qi of the spleen) can gather True Lead (the Jing of kidney water)
• True Lead can regulate True Mercury (the fiery Shen of the heart)
• When body and mind achieve perfect stillness, these three elements—earth, water, and fire—fuse into unity
• This transformative process resembles refining medicinal ingredients in an alchemical furnace

The second section depicts visionary phenomena during practice:

• "White snow" (pristine primordial Qi) manifests in the void
• "Yellow sprouts" (yang Qi in its nascent state) emerge during deep stillness
• Like spring's arrival after winter, when yang energy strengthens and all things germinate
• The furnace's fire must be tempered—excessive intensity would scatter the medicinal efficacy
• At this stage, purple clouds appear above the alchemical vessel

Natural imagery illustrates meditative states in the third section:

• The "Jade Pond" (Dantian energy center) blossoms like a lotus flower
• "Divine water" (refined Jing-Qi) flows as calm golden waves
• During the zi hour (11pm-1am), yang energy first stirs
• The scene resembles a bright moon illuminating heaven and earth with mirror-like clarity

The final passage details the refinement process:

• Cinnabar (heart fire) purifies yang energy
• Quicksilver (kidney Jing) refines golden essence (original Jing)
• Through the union of heart fire and kidney essence, golden essence and yang energy achieve perfect refinement

These descriptions portray the Neidan practice of transforming Jing-Qi-Shen and achieving the harmonious balance of water and fire (kan-li), revealing the subtle alchemical processes and sublime states of internal cultivation.

This passage elucidates the fundamental principles and methods of Daoist Neidan (internal alchemy) practice:

The term "Yang Qi" refers to the pure Yang energy within the human body, while "Golden Essence" denotes the pure Yin essence within the heart. When tempered by Yang fire (conscious intent), it transforms into cinnabar (symbolizing the initial formation of the internal elixir), and when nourished by Yin talismans (quiet cultivation), it becomes quicksilver (representing the transformative stages of the elixir). These alchemical metaphors using external substances like cinnabar and quicksilver were employed by immortals as necessary analogies to convey profound truths.

The Sun's soul (Yang spirit) resembles the essence of the Jade Rabbit, while the Moon's魄 (Yin essence) parallels the marrow of the Golden Crow. When gathered into the cauldron (Dantian, the energy center), they fuse into unity. The soul belongs to Wood (of the Five Phases), and since Wood generates Fire, the spiritual consciousness resides within the soul. The魄 belongs to Metal, and as Metal generates Water, the refined essence dwells within the魄. Through regulated breathing that nurtures the spirit, their harmonious blending within the cauldron forms "a pool of water" (symbolizing the liquid energy state of the internal elixir).

The "medicinal substances" (essential Jing, Qi, and Shen required for cultivation) originate from the Mysterious Cavity (Dantian) and are refined through "fire phases" (cultivation intensity) in the Yang furnace (lower Dantian). When the Dragon (original spirit) and Tiger (original essence) intersect, the precious cauldron produces the Mysterious Pearl (internal elixir). These substances include "crow's liver" (kidney essence) and "rabbit's marrow" (heart spirit), all born from the Mysterious Cavity. By applying the Samadhi True Fire (the unified flame of Jing, Qi, and Shen) within the Yang furnace to facilitate mutual generation between Metal (lungs) and Wood (liver), the "yellow sprout" (initial manifestation of the elixir) emerges, ultimately crystallizing into the Mysterious Pearl.

This Mysterious Cavity is no ordinary feature—it's jointly formed by Heaven and Earth (one's parents), called the Spirit-Qi Cavity that harbors the essences of Kan (kidneys) and Li (heart). This Mysterious Feminine Cavity predates physical form, existing not in any fixed location above, below, or between, but as an innate endowment. When parental essences unite to form the body, this Spirit-Qi Cavity takes shape, containing the vital essences of Water and Fire (heart and kidneys).

The mercury (heart spirit) within Wood carries a crimson hue, while the lead (kidney essence) within Metal weighs three catties of blackness. When lead and mercury (heart and kidney essences) combine, they form cinnabar (internal elixir), which through repeated refinement transforms into violet-gold (the highest grade elixir).

The scenery (Jing, Qi, and Shen) within one's homestead (body) is magnificent—like effortless plowing during spring's favorable winds and rains, turning the entire earth to gold (symbolizing bodily transformations during advanced cultivation). Here, the homestead represents the True Earth (spleen and stomach) within the body, while the scenery signifies Jing, Qi, and Shen. When the solitary Yang returns (initial Yang energy revival), with wind (breath) blowing and rain (saliva) moistening, until the Three Yangs harmonize (Yin-Yang equilibrium), the entire body undergoes transformation through cultivation akin to agricultural tending.

The Four Hundred Words on the Golden Elixir describes the mystical phenomena of Yin-Yang interaction and the harmonization of water and fire in Neidan (internal alchemy) practice.

The metaphor of "yellow sprouts": Just as yellow shoots naturally emerge from the earth when a farmer tills the soil, the term "gold" here describes their golden hue, symbolizing the nascent pure Yang Qi (vital energy) of the inner elixir.

The principle of lead-mercury union:

• True lead (the primordial Jing/essence of the kidneys) belongs to Kan-water (the northern trigram), yet its function manifests in the Li-palace (the domain of heart-fire). The black aqueous essence transforms into red elixir Qi, resembling dense clouds rising from the cauldron.
• True mercury (the primordial Shen/spirit of the heart) belongs to Li-fire (the southern trigram), yet its function reverses to the Kan-position (the palace of kidney-water), like a maiden holding a jade olive, journeying between north and south.

The vision of Yin-Yang convergence:

When the northern aqueous essence ascends and meets the descending southern fiery essence, up close it appears as an intermingling of red and black, while from afar it resembles a crystalline jade tree. This process is likened to "a maiden riding a dragon southward, an infant astride a tiger northward"—where the dragon and tiger (heart-Shen and kidney-Qi) spiral within the Dantian (energy center), inducing the alchemical effect of steaming vapors within the cauldron.

Key points of celestial circulation:

The trigrams Zhen, Dui, Kan, and Li are not mere directions but pathways of cosmic energy flow. Just as the handle of the Big Dipper rotates according to lunar positions, the body's internal Qi must complete its celestial cycle in a short time. Without unifying the Qi of the Five Phases (Wood, Fire, Earth, Metal, Water), one cannot emulate the natural movement of heavenly bodies.

The mystery of firing times:

The firing process (refining stages) is not confined to the winter solstice's midnight hour, nor is the "bathing" phase (gentle nurturing) limited to the spring and autumn equinoxes. The human body follows its own rhythms of Yin-Yang waxing and waning, and the moments for "advancing-retreating" or "bathing" arise naturally during celestial circulation.

Description of elixir formation:

The sun's soul (crow's liver) and moon's spirit (hare's marrow) are captured and refined together, coalescing daily into millet-sized particles. Through gradual accumulation—thirty grains in thirty days (weighing 38 zhu), three hundred in three hundred days (384 zhu)—the Golden Elixir eventually forms, measuring an inch in diameter and weighing one jin (catty).

The text concludes: Chaos embraces emptiness, emptiness encompasses the Three Realms (desire, form, and formlessness), yet the origin of all is but a single millet-sized spark of the elixir's seed.

This scripture elucidates the core principles and process of Daoist Neidan (internal alchemy) practice, employing metaphorical language to describe the essential techniques of Yin-Yang union and the meeting of dragon and tiger.

The opening passage describes "primordial chaos" as the state of Yin-Yang fusion. When the Five Phases (Wood, Fire, Earth, Metal, Water) coalesce and the Four Symbols (Azure Dragon, White Tiger, Vermilion Bird, Black Tortoise) harmonize, the practitioner's state can encompass the void and traverse the Three Realms (Desire Realm, Form Realm, Formless Realm). This cultivation originates from the "Mysterious Feminine Gate" (Dantian), small as a millet grain. The intercourse of heaven and earth produces true liquid, while the meeting of sun and moon condenses true Jing (essence). Understanding the fundamental principle of Kan (water) and Li (fire) interaction enables one to internalize the Three Realms.

The specific practice method involves: the heart's fire descending while kidney's water ascends, mirroring how heaven and earth unite to generate true liquid; the Hun (Yang soul, like the sun) and Po (Yin soul, like the moon) merging to produce true Jing. Mastering the art of water-fire balance allows one to open the Heavenly Gate (Baihui point) and close the Earthly Door (Huiyin point), causing sunlight to crown the head and moonlight to birth in the sea—thus unifying the Three Realms within the body.

The dragon-tiger metaphor follows: the Azure Dragon (liver Qi) rises from the east while the White Tiger (lung Qi) emerges from the west. Their combat and fusion transform into the essence of heaven and earth. Golden blossoms (lung's metal Qi) bloom on mercury leaves (heart's fire liquid), while jade stems (kidney's water essence) grow lead branches (root of kidney Qi). Through the ceaseless rotation of Kan and Li (water-fire), one obtains the enduring energy of heaven and earth in a brief span.

Practitioners must note: during "bathing" (mental purification), guard against dangers; when "adding and subtracting" (regulating fire intensity), proceed with caution. A day contains one hundred ke (ancient time units), a month three thousand ke, and ten months thirty thousand ke of cultivation—a single misstep may thwart the elixir's completion.

Finally, the conjugal union metaphor illustrates Yin-Yang interaction: one year of practice can "birth a child" (elixir formation), and every accomplished cultivator may ride a crane to ascend (attain immortality).

This passage elucidates the essential principles of Daoist Neidan (internal alchemy) practice. The core teaching reveals:

During cultivation, the "infant in the Kan palace" (kidney Jing-Qi) and the "fair maiden in the Li palace" (heart Shen-Qi) must be harmonized through the mediation of the "Yellow Matron" (the Earth element of the spleen). When the Yin and Yang energies merge in the Dantian (the "bridal chamber"), their union resembles marital coupling, ultimately forming the "sacred embryo" (Neidan). After ten months of "gestation" (gentle nurturing) and two months of "bathing" (purification) - totaling one year - the practitioner can refine the Golden Elixir that ascends from the Niwan Palace (upper Dantian) at the crown of the head.

The author Huang Ziru observes: Some find the 300-character Yin Fu Jing too brief, while others deem the 5,000-word Daode Jing overly verbose. Yet scriptures are like mustard seeds containing Mount Sumeru (symbolizing vastness within minimalism), or oceans receiving a hundred rivers. Since the Yellow Emperor and Laozi's era, Neidan theory developed over millennia—initiated by Wei Boyang, expanded by Zhongli Quan and Lü Dongbin, and perfected by the Song dynasty master Zhang Ziyang. Though concise, Four Hundred Words on the Golden Elixir encapsulates fundamental cultivation principles, serving as a crucial stepping stone on the Daoist path.

The author concludes by explaining "Golden Elixir": this Dan represents the innate primordial Qi inherent in all beings, attainable through "seven returns and nine restorations" (Zhoutian circulation). Practitioners are cautioned against clinging to words (like discarding the snare after catching the rabbit) or adding superfluous efforts, with hopes that discerning adepts may offer guidance.

(Note: The postscript dates the preface to 1241 CE, the Xinchou year of Chunyou reign, written during the Pure Yang month on a Pure Yin day at the western Xujiang city by Huang Ziru, styled "Hermit of Emptiness-Embodiment")