《北史·列传·卷七十八》
姚僧垣认为各内脏器官同时得病，不能同时治疗，而军中要务，莫过于语言，于是开处方逐次用药。
僧垣以为诸藏俱病，不可并疗，军中之要，莫过于语，乃处方进药，帝遂得言。
Yao Sengyuan believed that all of the internal organs had gotten sick at the same time, so they could not be treated at the same time. However, the military’s most important task was communication, so he prescribed a prescription and administered the medication gradually.