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Medicine, in its immediate application, regulates the body and eliminates potential hazards before they manifest; in its distant scope, it governs the populace and extends benefits infinitely. However, without profound study of the *Ling Shu* (Spiritual Pivot) and *Su Wen* (Basic Questions), achieving mental and manual proficiency is impossible.

When patients heed their physicians, it is akin to heeding divine will. If the physician is skilled and the patient trusts them, this is appropriate. Yet, if the physician's academic foundation is imperfect, the patient lacks confidence, resulting in half-trust and half-doubt, which is also natural.

However, diseases vary in depth, and efficacy varies in speed. If a pathogen resides only in the *Cou Li* (interstices of skin and muscle) yet fails to respond promptly, this is indeed a fault of mediocre medical skill. Conversely, if the condition approaches *Gao Huang* (the area between the heart and diaphragm, implying a critical or incurable stage), how can one expect recovery within a day or night? Changing doctors because there is no effect by evening, and changing again if there is no effect by the next morning, even a sage-like physician would find their skills exhausted.

Thus, society does not respect physicians, nor do physicians respect themselves. Patients urgently seek doctors, and doctors urgently seek methods. In ancient times, masters refined their skills before practicing; today, people refine their skills through practice. Ancients applied laws of medicine to treat diseases; moderns adapt laws to fit diseases. Ancients prescribed formulas based on symptoms; moderns force symptoms to fit formulas. They fail to realize that the sages of old detailed conditions but did not establish fixed formulas precisely to avoid using rigid patterns to address infinite variations.

Because mediocre practitioners struggle to penetrate the profound mysteries and lack fixed modes for syndrome differentiation and treatment, since the Han Dynasty, methods have become繁复 (complex and numerous), much like the various situations (*Shi*) in chess, involving strategies of reversal, opposition, and compliance.

The influence of *Yun Qi* (Five Movements and Six Qi) has shifted, altering the paths of antiquity and modernity. Local climates differ in suitability, constitutions vary in strength, social statuses differ in circumstances, ages vary in physical states, new versus chronic conditions require different methods, and internal versus external causes differ. These are all changes in the situation. To cling to a fixed situation while responding to thousands of variable scenarios leaves little chance of avoiding failure!

Therefore, those who value learning must thoroughly understand the Yin and Yang of heaven and earth, and penetrate the original source of life. One must know how the mechanism of generation is infinite, how the source of transformation ceases, how to revive critical conditions, and how to prevent mild conditions from worsening. Establishing the general outline and grasping the essentials, once the Zang-Fu organs and meridians are clear, and the root and branch, deficiency and excess are fully understood, one can return from the most wondrous, complex, and distant theories to the simplest, purest, and most proximate principle. Through thousands of changes, this aligns with what the *Classic* (referring to *Huangdi Neijing*) calls "concluding in a single word."