《大還心鑑》

The Da Huan Xin Jian scripture primarily elucidates the mysteries of refining the "Great Return Elixir" and common misconceptions among Daoist practitioners.

The secret teachings of Han Shanzi (a Tang Dynasty recluse) state: Simply comprehending the true meaning of "lead" (referring to the body's innate primordial Qi) makes the medicinal ingredients spontaneously marvelous; merely remembering the proper path of "mercury" (referring to the heart-mind or Shen) allows cultivation to reach sagehood, celebrating in unison with heaven and earth. The Daoist path requires a master's guidance—ancient sages never spoke directly but concealed alchemical secrets through the hexagrams of the Zhouyi (Book of Changes) and the mutual generation and restraint of the Five Phases (Wood, Fire, Earth, Metal, Water).

Fools hearing of the "Great Elixir" become doubtful, while the wise grasp its profound mysteries. The art of alchemy is precious and must not be taken lightly. Though the Cantong Qi (a Han Dynasty alchemical classic by Wei Boyang) left by the Three Ancient Sages has been copied by generations, few truly understand it.

People are often deluded by wealth and status, clinging to money and sensual pleasures while remaining indifferent to the path of longevity. Some cite Qin Shi Huang and Emperor Wu of Han as examples of failed immortality seekers—Qin Shi Huang spoke virtue but indulged in desires, while Emperor Wu longed for transcendence yet clung to sensual pleasures. How could they attain longevity? Why not mention the Yellow Emperor (the legendary ruler who achieved ascension)? He received the Great Return Elixir method from the Mysterious Maiden, teaching the nourishment of "gold and mercury" (primordial Qi and spirit) in the Dantian (energy center). Later generations mistakenly interpreted this as sexual practices.

The author claims to have sought the Dao in youth and fortunately received authentic transmission. He emphasizes that the union of lead and mercury (dragon and tiger) contains the origin of heaven and earth, embodying the essence of sun and moon while governing seventy-two types of minerals. Consuming the refined elixir prolongs life—as trustworthy as the five grains nourishing vitality.

[Key Concept Explanations]

1. Lead and Mercury: Neidan terminology—lead symbolizes primordial Qi/kidney water; mercury represents spirit/heart fire

2. Dragon and Tiger: Neidan terms—dragon denotes spirit (Shen); tiger signifies primordial Qi

3. Four Yellows and Eight Stones: Waidan mineral ingredients, here stressing true elixirs require no adulterants

4. Dantian: The lower abdominal energy center, crucial in Neidan practice

The Da Huan Xin Jian scripture primarily elucidates the mysteries and precautions of alchemical practice:

The refining of longevity elixirs (Divine Elixir and Yellow Essence) can prolong life, yet misusing poisonous substances (like Gelsemium) leads to certain death—this is self-evident truth. Genuine Dao practitioners understand that the Divine Elixir stands supreme among all methods, yet mastering its profound mysteries requires prolonged embodiment of the Dao's principles, never achievable overnight.

The text particularly emphasizes: No miraculous elixir can save those courting death through willful ignorance, just as the most compassionate Daoist teachings cannot liberate those burdened by heavy karmic obstructions. The crux of cultivation lies in personal realization of the Dao's true essence—one must never be deluded by wild claims or so-called "divine techniques" through credulous belief.

Core principles of the Great Return Elixir:

1. Alchemical foundation rests on the union of Yin-Yang (the Dao of one Yin and one Yang), mirroring heaven-earth dynamics

2. Materially, this manifests as the fusion of metal (true lead, symbolizing the White Tiger) and mineral (mercury within cinnabar)—this union constitutes the elixir (one metal and one mineral makes the dan)

Essential alchemical knowledge:

• Authentic mercury (mercurial essence) differs from common quicksilver. Master Tao Zhi noted ordinary mercury vaporizes as white smoke when heated
• Master Ma clarified: The "mercury" for alchemy differs from mundane quicksilver. Cultivation requires understanding the principle of "entering the sacred through the mundane"—the sacred realm never abandons the mundane, yet through the mundane one reaches the sacred
• Mercury inherently exists within cinnabar. Combined with lead, it refines into supreme treasure. Failed refinement causes mercury to revert

Key numerical symbolism:

• Lead symbolizes water (Northern River Chariot). Metal generates water—metal's number four plus water's one equals five (earth's number)
• Mercury represents the Azure Dragon (eastern wood). Wood's number three combines with cinnabar (fire essence, number two) also totaling five (earth)
• Earth in the Five Phases lacks fixed orientation yet permeates all seasons

Through alchemical principles, this scripture expounds the Daoist cultivation view of "mundane and sacred interpenetration," stressing that only through correct understanding of material properties and adherence to Yin-Yang and Five Phase laws can one refine the authentic Golden Elixir.

The Da Huan Xin Jian expounds the essential principles of alchemical cultivation:

The crux of alchemy (Neidan) lies in mastering the "Way of Three Fives" — the cyclical patterns of mutual generation and restraint among the Five Phases (Wood, Fire, Earth, Metal, Water). When Water pairs with Metal it forms five, when Wood pairs with Fire it forms five — this constitutes the foundational theory of alchemy. Yet the profound mysteries of the Daoist path are seldom truly understood. Only sages can freely wield this creative power of cosmic transformation.

The author recounts his youthful wanderings in fruitless search of truth, until sudden enlightenment revealed the Dao right before his eyes. However, he cautions that these methods must never be carelessly transmitted — falling into unworthy hands, they may bring misfortune instead of blessing. As Daoist scriptures warn: mortals chase longevity yet meet early demise because Yin-corrupting energies erode their vitality.

To refine the Returning Elixir (Golden Elixir), three essentials must be grasped:

1. The furnace and cauldron (alchemical vessels)

2. The firing times (alchemical rhythms)

3. The heart-method (cultivation essentials)

Yet understanding alone isn't enough:

• Transmission requires discernment of worthy recipients
• Cultivation centers on heart refinement — the mind is the root of transcendence
• The Golden Elixir is the supreme medicine for prolonging life, its consumption erasing one's name from underworld registers

Drawing from classics like the Cantongqi, Jinbi Jing, and Longhu Jing, the author discovered their core teachings all revolve around the marvelous application of lead and mercury (fundamental alchemical substances). To dispel future confusion, he composed this Mirror of the Great Returning Heart, hoping to guide cultivators through delusions. Those who truly comprehend will ascend like azure clouds and shine like the eternal moon.