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The physician relies on *Yi* (mental intention and intuitive judgment); their art is not limited solely to herbs and acupuncture needles. Therefore, the ancients spoke of using mud pills and straw cloaks to save people. In the story of Su Dan's orange well and spring water, patients recovered merely by eating orange leaves and drinking spring water; was this exclusively dependent on medicinal substances? This depends on the physician having perseverance and a sincere desire to benefit the world, without chasing fame or profit. In such cases, even *Zhuyou* (a traditional psycho-spiritual healing method) can cure diseases. By relying on one's own righteous Qi (vital energy) to repel pathogenic factors, and with accumulated virtue, treatment yields immediate results. This is indeed beyond the scope of ordinary reasoning. If one only calculates trivial profits, and the heart is not upright, how can one repel pathogens? Even if one uses proven prescriptions or rare and precious medicines, they may not necessarily produce miraculous effects. Thus, these practices should not be dismissed as mere nonsense!

Guo Yu of the Later Han Dynasty stated that there are four difficulties in treating nobles: "Being self-willed and refusing to follow the doctor's advice is the first difficulty; being careless with one's body is the second difficulty; stiffness in the joints preventing effective medication administration is the third difficulty; loving ease and hating labor is the fourth difficulty." I believe these four flaws do exist among nobles. However, there are also four difficulties for nobles in seeking medical care: summoning a doctor from a distant place who has never been tried before is the first difficulty; hesitating to use drugs slightly toxic due to fear is the second difficulty; the noble's high status intimidates the doctor, preventing them from fully expressing their expertise is the third difficulty; entrusting servants or relatives-in-law to manage matters leads to improper decoction preparation is the fourth difficulty. From this perspective, nobles should avoid contracting illnesses lightly and must be extremely cautious when taking medicine, just as Confucius said, "I have not yet understood the principle, so I dare not taste it," which is the proper approach.

Physicians exploiting others' crises were compared to murderers by ancient texts. The ancient texts state: Ignoring the urgency of the condition and arbitrarily demanding payment constitutes murder; demanding excessive wealth regardless of the patient's ability to pay constitutes murder; laziness and sleepiness while disregarding human life constitutes murder; unclear differentiation and diagnosis leading to erroneous medication constitutes murder; failing to treat promptly, allowing the condition to worsen rapidly, constitutes murder. Possessing these five faults, utilizing medical skills to kill is worse than wielding a blade. In the past, Zhang Shi, the wife of Chen Jingren, suffered from a minor ailment. A physician mistakenly administered blood-breaking and stasis-resolving medications, leading to her death. After her death, her soul became agitated and dispersed. One day, while Jingren went out to the suburbs, her spirit merged with him. He became trance-like and mad, singing and laughing alone until his death. Observing this case, when facing another's illness, how can one not be cautious?