《三国志·魏书·桓二陈徐卫卢传》
卫臻上疏说： 古人制定侵犯他人职权的法度，不是因为厌恶他勤于政事，实在是因为带来的好处很小，而损害很大。
臻上疏曰： 古制侵官之法，非恶其勤事也，诚以所益者小，所堕者大也。
Wei Zhen submitted a memorial saying: When the ancients set down the laws against encroaching upon the authority of others, it was not because they resented his diligence in political affairs, but because the benefits were little while the damage was great. 