《黄帝内经·灵枢·岁露论》
所以，如果不了解三虚的理论，即使医学知识达到相当的高度，但往往因这一点而像粗率庸俗的医生一样了。黄帝说：我想知道什么是三实。
故论不知三虚，工反为粗。帝曰：愿闻三实。
Thus, if one does not know the theory of the three vacuities, even if one's level of knowledge in medicine is quite high, one will often be just like a vulgar, incompetent doctor because of this one point. The Yellow Emperor said: I want to know what is the "three realities".