《龍虎還丹訣頌》

The Eighth Chapter Commentary on "Verses of the Dragon-Tiger Reverted Elixir" (annotated by Master Gu Shenzi)

I (the author’s self-reference) was born in the Sichuan region but later resided for a long time in Shandong. This master, surnamed Lin and named Taigu, with the courtesy name Xiangxian and the Daoist name Chunhezi, traced his ancestry to Taiyuan in Shanxi. He came to Liangzhou (modern-day Hanzhong, Shaanxi) as an official and, upon reaching adulthood, traveled widely in search of enlightened teachers, primarily journeying through Shandong. When Emperor Taizong of Tang learned of his reputation, he summoned him and bestowed upon him a mountain retreat in Jingzhao (Chang’an), hence his self-designation as "the Mountain Man of Jingzhao." In his later years, he retired to Huayang in Sichuan and was also known as "Master Huayang."

Throughout his life, he yearned for a tranquil existence of Wuwei (non-action), indifferent to fame and wealth, steadfastly maintaining a serene and natural state of mind. He believed that the essence of the Dao lies in the natural order of things—understanding this principle leads one to profound and mysterious realms.

The text analyzes trigrams such as Kan (Water) and Li (Fire), pointing out that the key to alchemy lies in mastering the application of true lead (White Tiger, representing metal essence) and true mercury (Azure Dragon, representing quicksilver). The work contains sixty-four alchemical verses, corresponding to the sixty-four hexagrams of the "Book of Changes." Later practitioners who study and apply them carefully will grasp their profound meaning.

When refining the elixir, one must open the divine furnace (alchemical stove) within a precious golden chamber (laboratory). The stove draws wind from all eight directions, as described in the ballad of the Great White Lord: "A three-tiered altar with an eight-sided furnace." Observing the transformations of the medicinal substances through the ninefold cauldron (referring to the yin-yang structure of alchemical vessels) resembles the ancient "Ode to the Jade Pouch," which states: "The essence of the divine dragon must be refined through the ninefold cauldron."

At the dawn of primordial chaos, the most revered path was that of the Golden Elixir (Jindan). One must learn to gather the essences of metal, wood, water, and fire from heaven and earth to refine the supreme elixir. The true secret of reverted elixir lies within these principles—when repeated practice seems to fail, one may instead enter an even deeper realm of realization.

(Note: In the text, "dragon-tiger" and "lead-mercury" are alchemical terms representing yin-yang, water-fire, and other complementary pairs in elixir refinement. "Ninefold" refers to the multi-layered structure of the alchemical furnace, symbolizing the cyclical patterns of heaven and earth’s yin-yang movements.)

Contemporary Interpretation:

People today engage in refining the five metals (gold, silver, copper, iron, and tin) to make elixirs, yet they fail to realize that the true mystery of the Golden Elixir (Jindan) lies hidden within the vast "ocean tides"—a metaphor for the movement of essence (Jing) and vital energy (Qi) within the human body. Many strive to refine cinnabar and mercury, unaware that the key to forging the Golden Elixir resides in the "Flower Pool" (Huachi), referring to the Dantian (energy center), the crucial site for cultivating Internal Alchemy (Neidan).

To refine the "Red Jade Powder" (a metaphor for the inner elixir) within the cauldron, one must first properly blend the "White Gold Paste" (representing refined essence and Qi) in the furnace. The Yin Fu Jing states that only those who understand the Dao of cultivation can be called sages—so those who can discern the true nature of "Gold Paste and Jade Powder" must indeed be sages.

In refining the elixir, one must recognize the true "cinnabar" (referring to primordial true lead, not ordinary cinnabar). Only that which is as pure and bright as a mirror is of the highest quality. Taoist Master Tao (Tao Zhenren) said this "cinnabar" is the supreme treasure within lead. Master Yuanyangzi also emphasized: the cinnabar needed for elixir-making need not be sought from distant places like Chenzhou or Jinzhou—it is found close at hand.

The foundation of elixir refinement is the "Dragon Bone of Azure" (a metaphor for the wood-natured mercury essence), which practitioners call "White Horse Teeth" (referring to the finest cinnabar). The Azure Dragon represents wood and mercury (quicksilver), which is extracted from cinnabar. Master Yin (Yin Zhenren) stated that cinnabar is the essence of wood, and when refined, it transforms into a watery form. Master Tao further clarified that "White Horse Teeth" signifies the highest-grade cinnabar.

The alchemical furnace must be constructed in accordance with the forms of the Eight Trigrams (Bagua) and the Five Sacred Peaks. Within the furnace, a yang cauldron is set to subdue yin essence, embodying the principle of water and fire harmonizing and yin-yang balancing. Observe how the dragon (mercury) and tiger (lead) meet within the furnace—it stirs wind and thunder, startling all manner of spirits. An ancient verse says: When the Five Phases (Wuxing) are inverted, the dragon emerges from fire; when they follow their natural order, the tiger is born from water. As water and fire merge in the cauldron, dragon and tiger surge within, giving rise to celestial and earthly marvels.

When the Golden Elixir first emerges from the "Dark Waves" (the water phase), it remains obscure and indistinct. Though the substance in the cauldron appears heavy, it is as light as snowflakes. Master Yuanyangzi explained that cinnabar is its essence, while snow is its outer form—using snowflakes to illustrate its ethereal clarity.

Do not fear the hardships of enduring cold and heat in cultivation. Persevere through the full "yang cycle" (a refining period), and you will forge a radiant light infused with the essence of the Five Emperors. When the proper season (the right moment in practice) arrives, the refined Qi of the Five Phases will transform into the Great Elixir.

Those who seek to refine the "Sun Crystal Soul" (the essence of the sun, symbolizing the yang spirit) must first locate the "Mysterious Source" (the primordial root), the origin of creation. Master Tao states in his later writings that the "Essence of the Supreme Mystery" is the foundation of Daoist practice. Then, one must harmonize the pairing of "Kan and Li" (water and fire, yin and yang), just as the Kan trigram (water) represents the masculine and the Li trigram (fire) represents the feminine—a union of complementary forces.

This passage elucidates the core principles and common misconceptions in Daoist Neidan (internal alchemy) practice:

The opening employs the metaphor of "dragon and tiger" to represent the essential elements of cultivation: nature (cinnabar-mercury, referring to internal Jing-Qi) and emotion (gold, representing the physical form). As the Cantongqi (Triplex Unity) states, internal essence forms the foundation while external form provides protection—only through their harmonious interaction can the alchemical process be completed.

It critiques prevalent errors of the time: many mistakenly believed alchemy involved merely smelting the eight minerals (ba-shi) or five metals, practices that actually damage the body's vital essences (red blood and yellow sprouts). True elixirs are not found in these external substances.

The text reveals the authentic alchemical path:

1. One must forge the cauldron with true gold (symbolizing the vessel of cultivation) to refine genuine mercury (essence)

2. The union of yin and yang (dragon and tiger) is essential for forming the elixir

3. One must follow the principles of the Qian (Heaven) and Kun (Earth) hexagrams, undergoing prolonged refinement through water and fire (a thousand days)

4. Precise measurement is crucial—the upper and lower crescents (each eight liang, totaling one jin) must be balanced

5. The key lies in the "Flower Pool" (the convergence point of water and fire)

The text acknowledges cultivation's difficulty: while learners are as numerous as hairs on an ox, true comprehension is rare. It cites the legend of Prince Huainan's ascension—where even his chickens and dogs achieved immortality—to illustrate how authentic realization transcends ordinary existence.

Finally, it unveils the essence of practice: mercury (essence) inherently resides within cinnabar, just as gold (true nature) exists within lead. Understanding this natural principle leads to mystical attainment. Even incomplete cultivation, when grounded in this realization, qualifies one as an earthly immortal.

(Note: Terms like cinnabar-mercury and lead-gold are Neidan terminology representing different energetic states within the body; "eight minerals" refers to cinnabar, realgar, etc.; "two crescents" symbolize the balanced halves of yin and yang.)

This scripture expounds the Daoist alchemical principle of Yin-Yang mutual generation and the fusion of lead and mercury:

The mystery of Yin-Yang mutual concealment is profound—within the Kan trigram (representing water) lies true gold (Yang), while the Li trigram (representing fire) contains true water (Yin). Master Tao Hongjing taught that the moon generates gold hence called "Kan male," while the sun produces mercury (flowing pearl) thus named "Li female," precisely as Master Mao Ying described "Yin harbors Yang, and Yang contains Yin."

One who truly comprehends the mystery of gold (lead) and water (mercury) may ascend to immortality in broad daylight. The "golden blossoms" mentioned here refer to the quintessence of lead, crystalline white like fish scales. Understanding this subtlety allows the true elixir to be refined within the alchemical furnace (the golden cauldron of Hua Pool).

The lead within fire and gold within water interact through repeated refinement, their hues deepening with each cycle. Yet without oral transmission from an accomplished master, mere scripture study cannot reveal the true path.

What we extract from Yin is actually Yang—this principle demands careful contemplation. When water and fire perfectly balance, the Golden Elixir (Jindan) emerges. Those who grasp the foundation of Yin-Yang enter the realm of deathless longevity.

The relationship between heavenly hun (Yang, symbolized by dragon) and earthly po (Yin, symbolized by tiger) remains obscure in many texts. True lead-mercury (golden male and aqueous worker) aren't ordinary metals but represent alchemical essences. As Master Yin Xi revealed, internal alchemy (Neidan) requires mastery over Kan-Li-Zhen-Xun (the eight trigrams' directions) and the harmonization of the Five Phases (Wood, Fire, Earth, Metal, Water).

The concluding "autumn-water pool" metaphor depicts the crystalline purity of the perfected Golden Elixir, mirroring the Jade Pouch Ode's description of frost-refined purity through ten lunar months.

This passage elucidates the essential principles of Daoist Neidan (internal alchemy) practice:

On the Ninefold Reverted Elixir (repeatedly refined inner elixir):

When the internal elixir reaches completion, it emits a violet-gold radiance. The term "ninefold" refers to the nine-month cultivation process from the first to the ninth lunar month. Upon reaching the ninth refinement, the elixir transforms into golden yellow, radiating purple light. Lü Dongbin (renowned Tang dynasty Daoist master) states that at this stage, the elixir can nourish the original Shen (spirit).

Elixir formation:

One must wait until the metallic essence undergoes complete transformation, condensing into a spherical form within the alchemical cauldron. The Cantongqi (Classic of the Kinship of the Three) explains that only when metallic essence returns to its fundamental nature can it be considered a true "reverted elixir." This condensed elixir is revered by immortals as the "king of medicines" - while ordinary remedies cure diseases, the reverted elixir can transform mortals into transcendents.

Alchemical forms:

The alchemical cauldron and medicinal substances take an egg-like shape, externally corresponding to the metallic phase (Geng-Xin) of the Five Phases, while internally manifesting as yellow.

Cultivation methods:

Practitioners should diligently study the Yinfu Jing (Scripture of the Hidden Talisman) and Daode Jing (Classic of the Dao and Its Power). Lü Dongbin (recently attained master) clarifies that elixir refinement need not rigidly follow three-year fire phases - even a small cauldron can achieve the process. Within this seemingly void state resides the essential solar Jing (essence), the vital energy of life.

Core principle:

The root of heaven, earth and all things resembles a seed. Those who comprehend this method will naturally cultivate the "River Chariot" (alternative name for internal elixir). Master Jinyangzi states: When the Qian (Heaven) trigram is refined to perfection, it produces Yellow Sprouts (nascent elixir form); when the Kun (Earth) trigram circulates sufficiently, it generates the River Chariot.

Theoretical foundation:

Through harmonizing the Five Phases, one captures the primordial Qi. To understand fundamental principles, one must study the Daode Jing transmitted by Laozi.

Admonition:

Time flies swiftly - a human lifespan passes like a dream. Yet the path to longevity exists in this very world. Sadly, people remain engrossed in worldly vanities, ignorant of transcendence techniques. As the Shennong Jing (Classic of the Divine Farmer) laments: Those who comprehend Yin-Yang principles escape death, yet worldly souls chase empty fame, ultimately unable to evade mortality.

(Note: "River Chariot" symbolizes internal elixir circulation; "Yellow Sprouts" denotes the elixir's initial formation; "Geng-Xin" represents the metallic phase in Five Phases theory)

This passage elucidates the core principles and essential practices of Daoist alchemy (Neidan):

The western direction corresponds to Metal, and the crucial point in alchemical practice lies in discovering the "white metal within water" (referring to the quintessential substance in alchemical ingredients). Master Tao (a renowned Daoist alchemist) states that when Metal (represented by the number three) combines with Water (five), it forms the most refined substance between heaven and earth. Metal serves as the source of Water, like a mother nurturing her child; Water represents the continuation of Metal, as a child dwells within its mother's womb. White symbolizes the essence of Metal, while black signifies the foundation of Water. The fundamental nature of Water constitutes the pivotal axis of the Dao, numerically represented as "one."

Practitioners must understand: lead (black) naturally sinks while silver (white) rises—this reflects cosmic patterns. Heaven and earth function as a great furnace where the essences of sun and moon intermingle. When western Metal (Gengjin) interacts with eastern Wood (Jiamu) in harmonious conjunction, those who grasp this subtle mechanism can master the transformations of all things. Master Tao teaches that realized adepts can command the creative transformations of heaven and earth, ascending from mortal state to immortal register.

Comprehending these principles resembles crossing a great river—once understood, all obstacles vanish. However, caution is essential: one must constantly cultivate hidden virtue (accumulating meritorious deeds), as reckless disclosure of celestial secrets invites calamity. All immortal scriptures share interconnected truths, as alchemy fundamentally operates through the mutual generation and restraint of the Five Phases. To know when the ninefold-cycled golden elixir (the supreme alchemical achievement) will form, one must complete three years of water-fire tempering (the thousand-day practice). Like accumulating millet grains until they weigh a full pound, perseverance is paramount.

Ancient sages all attained realization through diligent cultivation. The secret methods of refining stones and smelting metals (referring to alchemical processes) are not casually transmitted by immortals. Those who comprehend these profound principles surpass even the power to command cosmic transformations. Within one lunar cycle, signs of the golden elixir's initial formation appear, while the communion of Yin-Yang reaches the realm of "Xi-Yi" (the ineffable subtlety). Practice should resemble the hidden dragon (symbolized by the initial hexagram line), commencing fire regulation (controlling alchemical processes) during the Zi hour (when Yang energy first emerges).

The passage emphasizes that alchemical practice must follow Yin-Yang and Five Phase principles, carefully regulate firing times, accumulate virtue through good deeds, maintain secrecy, and persist through prolonged cultivation to achieve success.

This scripture describes the ten crucial stages of Daoist Neidan (internal alchemy) cultivation, using natural months and the dynamic interplay of Dragon-Tiger (symbolizing Yin-Yang energies) as metaphors for the alchemical process:

In the second month, Yang Qi (the Azure Dragon) begins to manifest as the essences of the Five Phases gradually gather. The vital essence (Wood Mercury) within the body starts to coagulate and reveal its numinous quality. At this stage, practitioners must carefully regulate the firing times (cultivation rhythm), sensing the movements of Yin Qi (the White Tiger) within the Dantian (elixir field). Master Mao Zhenjun explains this resembles the alternation of cold and heat, where Yin and Yang energies mutually stimulate each other.

The product of third-month cultivation is called the "Minor Reverted Elixir" (the three-year refinement produces the Major Reverted Elixir). When this minor elixir coagulates, it resembles true lead (representing pure prenatal Qi). Practitioners must balance the civil and martial fires (civil fire refers to gentle breathing, martial fire to intense concentration) to maintain Yin-Yang equilibrium. Sealing the cauldron (maintaining focused cultivation) and mastering the firing schedule allows one to witness the harmonious union of mercury and lead (Yin-Yang energies).

By the fourth month, the elixir takes preliminary form, akin to a fetus developing its ethereal and corporeal souls. The Azure Dragon and White Tiger (Yin-Yang energies) intermingle as the Jade Nectar (essential bodily fluids) secretly congeals, with Yang energy increasing while Yin diminishes.

The fifth month witnesses the intercourse of Yin-Yang, as yellow sprouts (the elixir's embryonic form) begin to grow. This resembles the Gou hexagram (one Yin line meeting five Yang lines), where Yin-Yang interaction gestates the spiritual seedling (elixir). This seedling constitutes the key to longevity, requiring perfect regulation of water and fire (breath and intention).

In the sixth month, true Yin coagulates into granules (the elixir's solid form), though beginners often err in their cultivation methods. Fellow practitioners should be reminded not to casually display these achievements to ordinary people—a strict prohibition from our ancestral masters.

By the seventh month, the elixir has secretly taken form, displaying color transformations of azure, yellow, red, and white. Only through balanced water-fire regulation can one refine the quintessence of Yin-Yang energies.

The eighth month's cycle reaches the Dui palace (west, corresponding to Metal Qi), returning the elixir to its original state. Carefully guarding the divine chamber (lower Dantian) nurtures the "dragon within fire" (pure Yang elixir) of immortality.

In the ninth month, the numinous mercury (elixir) dries like a pot of winter frost. One shouldn't hastily use it to transform mundane substances (pursuing supernatural powers), but wait until the Major Reverted Elixir is fully perfected.

The tenth month brings the Golden Elixir's complete metamorphosis, like a newborn infant. Immortals use metaphors of fruit ripening and fetal development to illustrate how the elixir requires ten months of cultivation to achieve final perfection.

(Note: The entire text employs Waidan (external alchemy) terminology as metaphors for Neidan practice, with each month corresponding to different cultivation stages, emphasizing the crucial importance of firing regulation and Yin-Yang balance.)

This passage elucidates the core principles and process of Daoist Neidan (internal alchemy) practice:

The "infant" symbolizes the refined Golden Elixir (Jindan, or Returned Elixir), the supreme essence born from emptiness. During cultivation, as yin qi dissipates and yang qi establishes itself independently, the process resembles silver being purified until the Crimson Dragon takes form. Within the alchemical cauldron, one observes only jade-green essences with no trace of yellow impurities—this mysterious fusion of transformations defies ordinary perception.

Repeated refinement to eliminate impurities (accumulated dust) enhances the elixir's numinous quality, as described in the "Great Change Hymn": subtle refinement gathers heaven-earth essences and harmonizes yin-yang. The practitioner must cultivate patience and perseverance while dragon (mercury) and tiger (lead) contend and merge, with yin receding as yang grows, until the medicinal ingredients gradually become spiritually potent. Master Yuanyang's description of the Azure Dragon pursuing the White Tiger, and vice versa, illustrates this dynamic battle between the two forces.

When yin essence is refined and returned to its origin, immortals call it "white langgan" (a jade-like synonym for the Golden Elixir). Ordinary eyes cannot perceive the elixir's true form, often mistaking it for mere redness. In truth, the Golden Elixir originates from the union of three substances (lead, mercury, etc.) corresponding to the Three Powers (heaven-earth-human), where yin-yang interaction forms the sacred embryo (internal elixir).

Advanced practitioners may witness the Purple River Chariot (imagery of internal elixir circulation) and be greeted by colorful phoenixes. When the Divine Water (mercury) of the Jade Pool (lead) merges and undergoes yang-fire tempering in the cauldron, it produces the sound of dragon-tiger combat. Though the path is arduous and prolonged, one must cultivate with unwavering resolve, free from worldly attachments.

Master Qingxia explains: the period from winter solstice to seventh month constitutes "nine returns," while the span from first month to seventh month represents "seven reversions"—these terms all reference cyclical patterns in Neidan cultivation.

This scripture elucidates the principles of Daoist alchemical cultivation:

The alchemical process reveals how Qi condenses into cinnabar, and water transforms into metal. Cinnabar forms through the coagulation of Qi, while gold emerges from aqueous origins. By comprehending the cyclical patterns of the Five Phases (Wood, Fire, Earth, Metal, Water) and the four manifestations (Lesser Yang, Greater Yang, Lesser Yin, Greater Yin), one can naturally manifest the dragon (symbolizing Yang energy) within the alchemical cauldron.

The foundation of alchemy lies in obtaining the "Mysterious Pearl" (metaphor for supreme treasure) beneath Mount Kunlun, recognizing that the dual forces of Yin-Yang are fundamentally unified. Ancient verses state: Only by understanding these two substances as one can one attain the state where the Three Flowers gather at the crown and preserve the authentic essence.

Through cultivation, when Yin-Yang primordial energy reaches fullness, one realizes all phenomena emerge from emptiness. Maintaining a state of undifferentiated chaos, free from desires and attachments, one comprehends the truth of "Xi-Yi" (inaudible as Xi, formless as Yi), thereby discovering the path back to the Dao.

The text admonishes worldly attachments: Do not crave fine food or luxurious garments, for the path to longevity lies before you. Those chasing fame and profit are as transient as flowing water.

The alchemical transformation progresses through stages: Mercury becomes gold, gold transforms into cinnabar, and cinnabar refines into the "Purple River Chariot" (advanced elixir). Achieving this chariot enables ascension to Penglai, the immortal isles.

Essential techniques involve understanding the four manifestations' rotation and the interaction of dual energies (Yin-Yang), through which the Golden Elixir spontaneously arises. From nothingness comes existence, and from existence returns to nothingness - within this chaotic state, the essential essence gestates.

The scripture emphasizes lineage transmission: Without oral instructions from an enlightened master, even extensive reading proves futile. As the classics state: Without a teacher's guidance, one ultimately cannot attain the Dao.

The cultivation foundation rests upon "Yellow Sprouts" (fundamental alchemical substance), the root of longevity. Ancient alchemists debated that while these sprouts relate to lead, true Yellow Sprouts transcend lead's material nature.

Through metaphors and口诀 (mnemonic verses), this scripture explains Neidan (internal alchemy) principles, processes, and states of attainment. It stresses transcending material desires, nurturing authentic essence within emptiness, while underscoring the crucial role of enlightened guidance.

This passage elucidates the core concept of "yellow sprout" (huangya, the primordial essence in alchemical practice) and the principles of Daoist alchemy:

The foundation of alchemy lies in using lead as the mother substance for cultivating the "yellow sprout," much like a seed germinating. Once the golden essence (jinhua) is obtained, the lead can be discarded. During smelting in the ash pool, lead sinks while silver floats upward - this light yellow substance is the "yellow sprout," also called autumn stone or royal yang. Its color resembles tender young sprouts, representing the supreme treasure of longevity.

The alchemical vessel must be the "central cauldron of earth" (wuji ding, the alchemical furnace embodying the central earth element). As the Laozi's verses state, the foundation lies in balancing water and fire through the earth phase. True alchemy requires achieving this central harmony, not relying on ordinary containers.

The alchemical process involves waiting until mercury transforms into white liquid before cinnabar (the elixir) can be produced. This cinnabar emerges from the golden fluid, just as the yellow sprout essence (huangjing) combines with red marrow to form the elixir.

The principle reveals that the white tiger (metal) and azure dragon (wood) are fundamentally one - different names for the same metal-wood Qi that coalesces into the elixir. Yet people often mistake ordinary impurities for the true yellow sprout. Only substances of the same kind can unite, just as farming requires grain seeds and hatching chickens need eggs.

The essential method references "three thousand maidens" (symbolizing yin-yang harmonization) and the cyclical Bagua (particularly the Xun trigram representing wind), indicating the need to master yin-yang transformations. The text criticizes those who pursue mere sensual indulgence without understanding Emperor Huangdi's true method of attaining immortality through alchemical union - the real secret lies in the work of returning the elixir (huandan).

The profound mystery resides in comprehending the dynamic interplay between Kan (water) and Li (fire). True practitioners resemble the recluses described in poetry, maintaining inner purity (a clear pool of water within) without chasing worldly fame.

Note: The alchemical terminology employs extensive metaphors - "yellow sprout" denotes the nascent form of the elixir, "white tiger and azure dragon" represent metal-wood energies, and "union with maidens" actually refers to yin-yang harmonization in internal alchemy (neidan) practice.

This passage from the "Ode on the Dragon-Tiger Reverted Elixir" expounds the core principles of Daoist Neidan (internal alchemy) practice, using metaphorical language to reveal the mysteries of elixir refinement.

At its heart lies the subtle transformation of "Kan-Li" (symbolizing the Yin-Yang energies) within the body. Just as chrysanthemums naturally turn yellow and knotweed blossoms red, cultivation is a gradual process. After prolonged practice (a thousand days to complete the work), all manifestations (the various transformations of Qi) will become evident within the Dantian (the "cauldron").

The author criticizes those who only know how to extract mercury from cinnabar for alchemy, unaware that the true mystery of the elixir path lies in the deeper interplay of Yin-Yang (the mystery within the mystery). Cultivation requires repeated "bathing" (a stage of regulating the fire phases) and relies on the power of Water among the Five Phases (intimacy with Water) to stabilize the foundation. When the elixir is perfected, just a tiny amount (a speck the size of a knife-point) can elevate one to transcendence.

The poem uses "autumn tiger battling spring dragon" as a metaphor for the fierce interaction of Yin-Yang energies within the body, producing thunderous resonance. The "Primordial Lord" (referring to the original spirit) sits undisturbed atop the "Three Terraces" (the upper, middle, and lower Dantian). The true secret of fire regulation lies in aligning with celestial timing (Bing-Ding refers to the proper moments for fire control).

Finally, the text laments how worldly people chase fame and profit (competing for mere scraps), while true cultivators rise above such concerns. To understand the secret of the Dragon-Tiger Reverted Elixir (the alchemical union of Yin-Yang energies), the key lies entirely within this poem—there is no need to seek other esoteric texts (the "golden-jade writings").

Note: In alchemical terminology, "Dragon-Tiger" often symbolizes the complementary opposites of Yin-Yang, Water-Fire, or Lead-Mercury, while "Reverted Elixir" refers to the process of refining Jing (essence), Qi (vital energy), and Shen (spirit) back to their primordial state.