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In treating diseases and administering therapy, precision and singularity are paramount. Although the manifestations of diseases under heaven are numerous, their root cause is singular. Although the methods for formulating prescriptions are flexible and varied, the principle of targeting the syndrome remains singular. Therefore, in the treatment of disease, one must accurately determine if it is cold, then thoroughly disperse the cold; if accurately determined to be heat, then thoroughly clear the heat. Once the root is extracted, all symptoms will be eliminated. Thus, the *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: "Treating disease requires seeking its root." Hence, when diagnosing, one must first explore the root of the disease before administering medication. If the observation is not yet definitive, it is better to wait a short while and examine more carefully. Once the key is grasped, using only one or two herbs can extract the root; even if the condition is deep-seated, five or six, or seven or eight herbs are already excessive. However, even if seven or eight herbs are used, they merely serve as assistance and guidance, while the therapeutic intent remains singular; this constitutes a master physician.

Current physicians, upon encountering a syndrome, often feel overwhelmed like gazing at the ocean, lacking definite views, thus inevitably resorting to chaotic, wide-spread prescribing strategies. Their reasoning is: believing deficiency requires tonification, yet fearing that tonification alone may cause harm, so they add resolving agents; believing excess requires purging, yet fearing that purging alone may cause harm, so they add tonifying agents. The most laughable cases involve firmly administering formulas that are neither cold nor hot, combining tonification and purgation, claiming such approaches are extremely safe. How does this correct bias and remedy defects? Others combine formulas for treating wind, fire, phlegm, and food stagnation, claiming thoroughness. How does this follow the root or the branch? In such cases, managing drug interactions is insufficient, let alone curing the disease. Even if recovery occurs by chance, one cannot know if it was due to tonification or purgation. If recovery fails, one cannot know if tonification or resolving caused harm. Thus, mediocre physicians who remain incompetent until death err due to lack of definite views and imprecise prescribing. If the disease is superficial, there is little harm; but if life and death hang in the balance, even good medicine without courage to reach the disease site is like a cup of water on a cartload of burning wood—likely insufficient. How much worse is it to hold a middle ground and prescribe recklessly? These individuals delay people's lives; physicians must deeply reflect on this.

Therefore, the essence of therapy must be precise, singular, and unadulterated, which is the highest perfection. Rather than mixing resolving agents with tonics, it is better to use pure tonics sparingly and advance gradually. Rather than mixing tonics with purgatives, it is better to use pure purgatives mildly and advance from light to heavy. Thus, tonification should start light and become heavy, aiming for success; purgation should start mild and become harsh, stopping once the disease is addressed. If prescription composition is imprecise, tonification cannot treat deficiency, and purgation cannot remove excess, leading almost inevitably to error.

I speak these words knowing some will ridicule them as pedantic, asking: "Ancients often used ten to twenty herbs; why emphasize precision? Were ancients less capable?" This shows ignorance of the subtleties of mutual restraint and mutual enhancement, and a failure to understand Li Dongyuan’s (Li Gao’s) methods. I say: Mutual restraint refers to controlling toxicity. Just as one might employ extraordinary talent but fear excessive harm, one must prepare safeguards to prevent minor issues, aiming for moderation. This applies only to unavoidable situations, rarely occurring. It is uncommon to see standard methods employing effective herbs only to self-sabotage. Mutual assistance and facilitation are used because single strength may be insufficient, not to create internal contradiction. Observing Zhang Zhongjing’s formulas, they are concise and uncluttered, rarely exceeding a few herbs. The mindset of sages is evident here. If unavoidable, using qi-moving within tonics or tonifying within qi-movers is natural. For example, Xiao Chai Hu Tang (Minor Bupleurum Decoction) in the *Shanghan Lun* (Treatise on Cold Damage) uses both Renshen (Ginseng Radix et Rhizoma) and Chaihu (Bupleuri Radix); Tao Hua’s Huanglong Tang (Yellow Dragon Decoction) uses both Dahuang (Rhei Radix et Rhizoma) and Renshen. This is precise and subtle, unlike modern mixed prescribing. Understanding this principle reflects true clinical flexibility. Regarding Li Dongyuan’s formulas with over ten or twenty herbs, his extensive use has specific intent. Learners emulating him must summarize all herbs and properties in a formula. Identifying dominant vs. auxiliary herbs, and their combined energetic effects, creates a unified character. Grasping this holistic intent captures Li Dongyuan’s spirit. Treating head for head and foot for foot, or blindly mixing based on partial understanding, hoping for luck, cannot claim to follow Li Dongyuan. Although Li Dongyuan’s methods are not bad, I prefer following Zhang Zhongjing rather than venerating Li Dongyuan, fearing that failing to grasp clarity leads to narrowness. The errors extend beyond single formulas; wise practitioners should distinguish this.

1. Treatment methods of the *Neijing*. Qibo stated: Suppress what is high, elevate what is low, cool what is warm, warm what is cool, consolidate what is scattered, dissipate what is constrained, moisten what is dry, relax what is tense, soften what is hard, strengthen what is brittle, tonify what is deficient, purge what is excess, assist with beneficial agents, harmonize with suitable agents, calm each qi, ensuring clarity and stillness, so pathogenic qi declines and returns to its origin. This is the general framework. Qibo also said: Treat cold with heat, heat with cold; reverse-treat mild cases, follow-treat severe cases; reduce hardness, eliminate invaders, warm labor-induced conditions, dissipate knots, attack retention, moisten dryness, relax tension, consolidate scattering, benefit loss, promote overflow, calm fright, induce vomiting for upper pathogens, purgation for lower pathogens, massage and bathe,劫夺 (rob/attack) weak conditions, open blockages, adapting to the situation. The Yellow Emperor asked: What are reverse and follow treatments? Qibo replied: Reverse is regular treatment (Zheng Zhi), follow is counter-treatment (Fan Zhi). Follow lightly or heavily depending on the case. The Emperor asked: What is counter-treatment? Qibo said: Heat treated with cold agents, cold treated with heat agents, obstruction treated with obstructive agents, diarrhea treated with purgative agents. One must subdue the main factor and address the cause initially; though starting similarly, the outcome differs. Qibo added: Diseases originating internally should first treat Yin, then Yang; reversing this worsens the condition. Diseases originating externally should first treat the exterior, then interior; reversing this worsens the condition.

2. Medicinal treatment values precision and bravery. For chronic diseases, investigate the beginning and end, treating slowly is appropriate. For acute diseases, once deficiency/excess is confirmed, use harsh agents to attack the root directly; extraction is easy. Hesitation allows deep-seated conditions to form, determining life or death—who bears the blame? True interior excess warrants Liang Ge San (Cooling the Diaphragm Powder) or Cheng Qi Tang (Order the Qi Decoction); true interior deficiency warrants Li Zhong Tang (Regulate the Middle Decoction) or Shi Quan Da Bu Tang (Complete Ten Tonifying Decoction). Exterior deficiency calls for Baizhu (Atractylodis Macrocephalae Rhizoma), Huangqi (Astragali Radix), and Jian Zhong Tang (Establish the Middle Decoction); exterior excess calls for Mahuang (Ephedrae Herba), Chaihu (Bupleuri Radix), Guizhi (Cinnamomi Ramulus), etc. Use one herb as Sovereign, two or three as Ministers/Assistants/Guides, in large doses. Using many herbs relies on their power and safety assurance. Mild herbs may use several taels; potent herbs several qian. Dosages of 3-5-7 fen are mere counting exercises, childish playfitting for resolving crises?

3. Treatment principles require knowing evil vs. righteous qi and weighing importance. Treating excess is like weeding rice fields; barnyard grass (weeds) harms rice. Removing one weed for one weed, or two for two, is skilled weeding. Removing one weed but damaging two rice plants, or two weeds damaging four plants, is poor skill. Mistaking rice for weeds and removing all results in no rice. Thus, purgation requires accurate identification and avoiding excess. Treating deficiency is like distributing rations: one person gets one sheng, ten get one dou; daily supply suffices. Giving one dou to a hundred, one hu to a thousand, cannot sustain an army; if supplies fail, soldiers abandon previous rations. Deductions make it worse. Thus, tonification requires measured weight and difficulty in simplification.

4. Deficiency/excess treatment generally holds that excess tolerates cold, deficiency tolerates heat. Hence, tonification includes warmth, purgation includes coolness. Coolness corresponds to autumn qi, Yin governs killing. All things meeting it cease growing; thus, it is unsuitable for tonifying Yuan Qi. If coolness is unsuitable for tonification, cold is even more so. Even in fire-excess/qi-deficiency cases where cool tonification seems indicated, it is temporary for fire; once fire clears, stop. It is not a method for treating deficiency. Some claim bitter-cold herbs tonify Yin. The *Neijing* states: "Deficient form is warmed by Qi; deficient essence is tonified by Flavor." Agents suitable to humans are called tonics. Unheard of is calling bitter-flavored, inferior-smelling, unsuitable agents tonics. Although the *Neijing* mentions Water phase masters use salty for purgation and bitter for tonification, this refers to Five Phases annual qi flavors. Moreover, wheat, mutton, apricot, leek are bitter-tonic examples. How can Dahuang (Rhei Radix et Rhizoma) and Huangbai (Phellodendri Cortex), with bitter-inferior qualities, be called tonics? This is illogical. Wang Yingzhen said: "A spark of True Yang resides in Kan Palace; solidify roots with sweet-warm agents. Sweet-warm benefits, cold does not tonify; laughable are mediocre doctors wasting effort." This summarizes the point; observe carefully.

5. Tonification and purgation both treat disease, but know the essentials. Acute disease in robust individuals can be purged. Purgation is temporary; chronic weakness cannot withstand repeated purgation without harm; thus, purgation yields slow results. Chronic weakness should be warmed and tonified. Tonification is for routine use; once the root is damaged, abandoning tonification prevents recovery; thus, tonification seeks no quick effect. However, the key is: when treating, regardless of apparent deficiency, if no excess evidence exists, combine tonification to regulate Ying-Wei, Jing-Blood Qi. Regardless of apparent fire, if no heat evidence exists, combine warming to cultivate Mingmen and Spleen/Stomach Qi. This is the essence of tonification/purgation; ignoring this leads to disaster.

6. Treatment involves reverse/follow methods due to false/true cold/heat, per the *Neijing*. "Reverse is regular, follow is counter." Treating heat with cold, cold with heat is regular/reverse. Treating heat with heat, cold with cold is counter/follow. Treating cold disease with heat agents without relief indicates lack of Fire; treat Mingmen with Renshen (Ginseng Radix et Rhizoma), Shudi (Rehmanniae Radix Preparata), Rougui (Cinnamomi Cortex), Fuzi (Aconiti Lateralis Radix Preparata). This is Wang Bing’s "Enrich the source of Fire to dissipate Yin shadows," a regular method. Treating cold disease with heat agents without relief, cured by cold agents, indicates false cold; treat with cold following method. Treating heat disease with cold agents without relief indicates lack of Water; treat Kidney with Liu Wei Wan (Six-Ingredient Pill with Rehmannia). This is Wang Bing’s "Strengthen the master of Water to suppress Yang brilliance," a regular method. Treating heat disease with cold agents without relief, cured by Renshen, Ganjiang (Zingiberis Rhizoma), Rougui, Fuzi, Ba Wei Wan (Eight-Ingredient Pill), indicates false heat; treat with heat following method, known as "Sweet-warm removes great heat." Currently, deficiency is common, excess rare; thus, true-cold/false-heat is frequent, true-heat/false-cold is rare.

7. Probing disease methods are essential. When deficiency/excess or cold/heat is unclear, or treatment intent is undecided, use probing. Suspecting deficiency but undecided on tonification: use light resolving agents, few herbs, probe first. If discomfort ensues after resolving, it is true deficiency. Suspecting excess but undecided on purgation: use sweet-warm pure tonics, few herbs, probe first. If stagnation ensues after tonification, there is excess pathogen. False cold: slight warming causes irritability. False heat: slight cooling causes nausea/vomiting. Probing reveals truth, stabilizing intent. The *Neijing* says: "Seek the existent, seek the non-existent." And: "For false signs, reverse approach." This is the meaning. Probing must be concise, not chaotic. Conciseness distinguishes true/false; chaos confuses right/wrong. This is a flexible method for ambiguous cases, used only when necessary.

8. *Yizhen* treatment methods state: Seeing phlegm, do not just treat phlegm; seeing blood, do not just treat blood; no sweat, do not induce sweating; having heat, do not attack heat; wheezing arises, do not deplete Qi; sperm leakage, do not astringe. Understanding this essence makes a medical hero. Practicing medicine without understanding Qi, how to base treatment? Laughable are those in the Dao who have not reached understanding. The poem speaks of "treating by not treating," aligning with the *Neijing*'s principle of seeking the root, a true maxim. "Practicing medicine without understanding Qi, how to base treatment" is also reasonable. Heaven and Earth: Yang governs Qi (Pre-heaven); Yin forms shape (Post-heaven). Ascending/descending, cold/heat, dark/light, wind/water movement all depend on Qi for motion. Human Qi follows suit. Excess disease stems from Qi excess; deficiency disease from Qi deficiency. Wind-cold, stagnation, phlegm-fluid, blood stasis: if Qi does not move, pathogens remain (Qi excess). Consumption, leakage, Yang collapse, blood loss: if Qi does not secure, Yuan Qi does not recover (Qi deficiency). Saying "purge fire" actually means descend Qi. Saying "tonify Yin" actually means generate Qi. Qi gathering brings life; Qi scattering brings death. Disease arises from Qi; treatment relies on Qi. The value lies in knowing Qi’s excess/deficiency and its origin. Recently, shallow practitioners, upon examining patients, always cite "internal injury/external contraction" or "phlegm reversal/Qi stagnation." Ha! Ha! These are the "Eight-Character Mantra" of physicians. With these eight characters, why need Eight Arrays? Why seek root sources and appear pedantic? People suffer; this is terrifying.