《黄帝内经·素问·解精微论》
黄帝说：你问这些问题，对治疗上没有多大帮助，但也是医生应该知道的，因为他是医学中的基本知识。
帝曰：若问此者，无益于治也，工之所知，道之所生也。
Emperor Huang said: Although the questions you asked are of little benefit to medical treatment, they are the basic knowledge of medicine, so a good doctor must know them.