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The *Classic* states: Restraining a prescription is like tying a bag. If the bag is full but not tied, contents will leak; if a prescription is formed but lacks restraint (strict structural rules), the spirit and qi will not act in concert. Therefore, only by mastering pulse diagnosis can a physician accurately identify diseases. When disease corresponds to medicine, ancients often used a single herb to treat, for its pure nature yields faster efficacy. Today's practitioners, failing to recognize disease sources or differentiate pulse patterns, use chaotic medications, resulting in unfocused effects and few successes. Thus, a physician uses medicine like a general uses troops: anticipating enemies and devising strategies is the general's wisdom; breaking armies and killing thieves is the soldier's strength; assessing pathogenesis is the physician's intelligence; attacking evil and curing disease is the herb's capability. Without soldiers, one cannot defeat enemies; without herbs, one cannot attack evil. Hence, good generals nurture soldiers, and superior physicians stockpile and utilize herbs. However, how does one nurture soldiers? How does one stockpile herbs? Soldiers have emotions to examine and talents to test, yet are still said to be hard to know; how much more so are herbs, which lack emotion and whose natures are unpredictable? They cannot be fully verified by words nor reached by mere speculation. To know their exact, error-free principles requires careful and thorough investigation; who else could achieve this? If one attempts random administration, once swallowed, it cannot be retrieved; life and death are decided instantly. Is this not terrifying? In ancient times, people suffered mostly from the Six Excesses (Wind, Cold, Summerheat, Dampness, Dryness, Fire) and rarely from the Seven Emotions (Joy, Anger, Worry, Thought, Sorrow, Fear, Fright). Thus, treatment often involved one herb for one disease, or one herb for multiple diseases. Today is different: emotions are intense, desires are deep, essence and qi are depleted, and the Six Excesses easily invade. Internal and external pathogens adhere firmly, making conditions vastly different from antiquity. One must combine the strengths of many herbs while mitigating their weaknesses. Not only must one understand the properties of Cold, Heat, Tonification, and Drainage, but one must also master the dynamics of benefit and loss. The physician's intent and the herb's nature must merge like spirits interacting, enabling effortless application and achieving pacification without harming life. Those who value life should not study this deeply.

The tonification and drainage based on the Five Zang organs' "Bitter" (Ku) and "Desire" (Yu) are the first principle of medication. Why? Within each Zang organ resides a Spirit (Shen), each with its own Nature (Xing), and these Natures differ. Form above (Xing er shang) refers to the Shen, which has perception but no substance; form below (Xing er xia) refers to the physical mass, i.e., the Zang organs, which have substance but no perception, existing separately. The Liver stores Hun (Ethereal Soul), the Lung stores Po (Corporeal Soul), the Heart stores Shen (Spirit), the Spleen stores Yi (Intellect) and Zhi (Will), and the Kidney stores Jing (Essence) and Zhi (Will/Fear). These refer to the sentient nature, i.e., the Shen. Shen is defined as the unfathomable interplay of Yin and Yang. This is the formless aspect, the stored Nature. Because it is formless, it governs the有形 (physical) body. "Bitter" and "Desire" refer to likes and dislikes. Violating its nature causes "Bitterness" (distress); fulfilling its nature creates "Desire". "Desire" is what the organ's Spirit likes, which constitutes Tonification (Bu). "Bitterness" is what the organ's Spirit dislikes, which constitutes Drainage (Xie). Tonification and Drainage depend on Bitter and Desire; Bitter and Desire stem from Organ Nature, transcending the Five Elements and Yin-Yang categories, acting through the Shen. For example: The Liver suffers from tension (Ji), which implies destruction; thus it is bitter and dislikes it. Urgently consume Sweet (Gan) herbs to relax it; relaxing fulfills its nature. Wood spreads and reaches out, representing the image of Wood; rising and expanding is the function of Hun. Thus, the Liver desires dispersion; urgently consume Acrid (Xin) herbs to disperse it; dispersing releases constraints, and dispersion is Tonification. The Heart suffers from laxity (Huan). As the Monarch, the Spirit's nature prefers convergence and dislikes laxity. Urgently consume Sour (Suan) herbs to astringe it; astringing fulfills its nature. The Heart Monarch is naturally harmonious; if invaded by pathogenic heat, it becomes restless. Urgently consume Salty (Xian) herbs to soften it; softening means harmonizing, removing heat, and softening restless, rigid qi, restoring balance and allowing downward interaction with the Kidney (Water-Fire intersection/Ji Ji). Thus, softening is Tonification. The Spleen suffers from Dampness (Shi); it favors movement over stagnation. Dampness causes stagnation; urgently consume Bitter (Ku) herbs to dry it, restoring its preferred state, thereby strengthening the Spleen. If overly dry, one seeks to moisten/harden; Sweet (Gan) enters the Spleen first due to Earth's transformation; thus, urgently consume Sweet herbs to moderate it, using Sweet to Tonify. The Lung is the master of Qi; normally smooth, when pathological, it rebels. Rebellion violates its nature; thus, urgently consume Bitter herbs to drain rebellious Qi. The Lung governs the Upper Jiao, its policy is收敛 (convergence) and肃降 (descending). Its nature prefers convergence; urgently consume Sour herbs to astringe it. Heat harms the Lung; when invaded by heat, urgently consume Acrid herbs to drain heat. Without convergence, Qi is uncontrolled, indicating Lung dysfunction. Thus, use Sour to converge, fulfilling its convergent nature to clear the Upper Jiao; convergence is Tonification. The Kidney suffers from Dryness (Zao). The Kidney stores Essence and Will, governs fluids, and belongs to True Yin Water. Its nature is moist and dislikes aridity; thus, urgently consume Acrid herbs to moisten it. The Kidney desires firmness (Jian). Without firmness, it cannot strengthen the body. Four Qi become soft in damp-heat and firm in cold; Five Flavors become soft with Saltiness and firm with Bitterness. Thus, urgently consume Bitter herbs to firm it, fulfilling its desire for firmness; firmness is Tonification. Once Bitter/Desire is understood, Five Flavors require detailed examination. Water moistens downward, producing Saltiness; Fire flares upward, producing Bitterness; Wood curves and straightens, producing Sourness; Metal transforms, producing Acridity; Earth plants and harvests, producing Sweetness. Bitter moves straight and drains; Acrid moves horizontally and disperses; Sour binds and converges; Salty stops and softens hardness; Sweet can move up or down, Earth is central and encompasses all Five Elements; Pale (Dan) flavor has no specific Zang affiliation, enters the Taiyang channel, and promotes urination. Herbs are有形 (physical) and devoid of情 (emotion/sentience), each exerting power through a single nature. Humans inherit Five Elements, possessing bodies with Shen and 情, relying entirely on Yin-Yang transformations, mutual restriction and growth for function. If disharmony occurs and drugs are driven to remedy defects, knowing only to use Cold for Heat leads to intensified heat; using Heat for Cold leads to intensified cold. One must seek the root to weaken it and follow the cause to subdue it. As the *Classic* says: "First determine the primary target, then subdue the underlying cause." This avoids the harm of excessive Qi dominance and achieves peaceful nourishment. Transforming the inert into the sentient relies on the physician's divine variation. Students should not fail to silently comprehend this purport! Ancients advised physicians: "Conduct yourself with integrity (Fang) but wisdom with flexibility (Yuan); keep your heart small (cautious) and your courage large." Alas! The divine excellence of medicine lies herein.