《太上靈寶淨明九仙水經》

The Supreme Lingbao Jingming Scripture of the Nine Immortals' Water uses the characteristics of water as a metaphor for the circulation of blood vessels in the human body:

The network of blood vessels in the body resembles the water systems of the earth, originating from the navel region (Dantian), flowing through the limbs, and ultimately converging in the head and kidneys. Just as water can both carry boats and overturn them, smooth blood circulation brings vitality, while stagnation leads to illness. Adepts (superior practitioners) observe the properties of water—its meandering course, hidden undercurrents, varying intensity, branching tributaries, pooling into deep abysses, evaporating into clouds, and descending as rain—to comprehend the mysteries of blood circulation.

The specific correspondences are as follows:

• The small and large intestines correspond to the Yangtze and Huai River systems
• The heart and pericardium mirror the Zhang River basin
• The spleen, as the "mother of blood," stores blood like a lake
• The kidneys resemble the ocean, serving as the crucial site for transforming Jing (essence) and blood
• The dark hair on the head reflects clouds in the sky
• Perspiration parallels heavenly rainfall

Immortal Ge Zhongqing points out: Blood circulation relies on the propulsion of Yuanqi (primordial Qi), just as seawater connects with celestial Qi through the mythical Weilu (the cosmic drain where waters return). Blood returns from the fingertips and toes to the heart meridian, rooted in the lower Dantian below the navel. Purified by the liver, governed by the heart, disseminated through the lungs' dispersing function, and ultimately regulated by the spleen—when blood and Qi harmonize, health is maintained; when their flow becomes imbalanced, illness arises.

Through this unique "water-blood analogy," the scripture unveils the core Daoist health preservation principle of "correspondence between heaven and human." The text exemplifies how Neidan (internal alchemy) practitioners draw parallels between macrocosmic natural phenomena and microcosmic physiological processes to cultivate holistic wellbeing.

This scripture elucidates the principle of how the circulation of Qi (vital energy) and blood within the human body corresponds with the natural movements of heaven and earth, using culinary and hydrological metaphors for illustration. The main concepts can be understood as follows:

Observing the cooking process reveals profound truths: fire represents primordial Qi (life energy), while water symbolizes blood. The transformation of food from raw to cooked mirrors the energetic changes within the five viscera (heart, liver, spleen, lungs, and kidneys). When steam rises (analogous to Qi ascending toward the celestial palace), and partially condensed droplets descend, we witness what Neidan (internal alchemy) practitioners call "yellow sprouts and white snow" — symbolic representations of Jing (essence) and Qi transmutation.

The master Yinxuanzi, through studying water's transformative patterns, verified the Daoist cosmological principle: "The Dao begets One, One begets Two, Two begets Three, and Three begets all things." The five viscera correspond to distinct water systems:

• Kidney Water corresponds to the ocean
• Spleen Water corresponds to lakes
• Lung Water corresponds to the Yangtze River
• Liver Water corresponds to the Ji River

Each follows its unique circulatory pattern and originates from specific sources.

The movement of primordial Qi follows celestial patterns (the cosmic framework), while blood circulation mirrors hydrological systems (waterway networks). By comprehending blood's circulatory pathways within the body, one can understand profound phenomena like the "reversed flow of the Yellow River" — a special physiological state achieved in advanced Neidan practice.

The concluding section explains the method for calculating one's birth timing: based on the year, month, day, and hour of parental conception, using the Qian and Kun chapters of the Zhouyi (Book of Changes) alongside the "Great Expansion" divination method (Dayan shu) with fifty yarrow stalks. Determining this starting point reveals the secrets of cosmic creation.

[Key Concepts]

1. Yellow sprouts and white snow: Symbolic representations of Jing-Qi transformation in Neidan

2. Great Expansion method: Zhouyi divination technique using fifty yarrow stalks

3. Five viscera corresponding to five waters: The theory mapping bodily organs to natural water systems

4. Reversed Yellow River flow: A metaphor for extraordinary physiological states in advanced cultivation

This scripture elucidates the correspondence between the circulation of Qi (vital energy) and blood in the human body with natural tidal movements, embodying the Daoist concept of "the human body as a microcosm of the universe":

Enlightened adepts who cultivate the Dao (those with luxuriant hair maintaining vitality into old age) need not deliberately consume elixirs, for they comprehend the principles governing Qi-blood circulation (knowing the calculations of its origins). Just as Yu the Great regulated floods by dredging river channels, human Qi and blood also require harmonious regulation.

Lady Wu of Fufeng (modern Baoji, Shaanxi) explained: The principle of water circulation resembles seawater evaporating into clouds, rainfall converging into rivers, and ultimately returning to the ocean—this tidal movement corresponds to human blood circulation. The body's blood vessels measure 36,500 zhang (ancient measurement) in total length, resembling the orderly movement of threads on a loom.

Using numerical correspondences of the Five Phases (Water-1, Fire-2, Wood-3, Metal-4, Earth-5), the tidal recession from summer solstice to winter solstice's tidal surge follows natural patterns. Observing ocean tides reveals terrain elevations, just as one's birth date (year, month, day, and hour of parental conception) indicates the abundance of primordial Qi.

Master Hu An, an expert in tidal patterns (tide navigator), could predict tidal ebbs and flows. When instructing Liu Yanqing, he emphasized coordinating limb movements with Yin-Yang principles, referencing both the five organs (the bronze anatomical model) and divination insights (turtle shell revelations). After nine years of cultivation, Liu mastered the art of controlling water currents.

Xu Zi of Danyang (modern Jiangsu) studied tidal patterns for thirty years before comprehending the profundities of the Water Classic. Through analogies with natural tides, this scripture expounds the principles of human Qi-blood circulation, demonstrating how the Dao (the Way) fully integrates within our bodies—transcending distinctions between internal and external realms.

(Note: "Luxuriant hair" symbolizes robust Qi-blood vitality; "calculations" refer to cosmological computations; "bronze anatomical model" indicates ancient acupuncture teaching aids; "turtle shell revelations" denote divinatory insights from plastromancy.)