《黄帝内经·素问·异法方宜论》
黄帝问道：医生医疗疾病，同病而采取各种不同的治疗方法，但结果都能痊愈，这是什么道理呢？
黄帝曰：医之治病也，一病而治各不同，皆愈，何也？
The Yellow Emperor asked: Doctors treat diseases, and they adopt different treatment methods for the same disease, but the results are all cured. What is the reason for this?