《汉书·志·地理志下》
说 虞仲逃隐到蛮夷，隐居不言，身心清洁，所摒弃的合乎权道。 
谓 虞仲夷逸，隐居放言，身中清，废中权。 
It is said that Yu Zhong fled to the barbarians, living in seclusion, being clean in mind and spirit, and that what he abandoned was appropriate.