《三国志·魏书·王卫二刘傅传》
当时百姓生活困苦，但各种徭役很多，卫觊上疏说： 改变一个人的性情，靠强迫是办不到的。做为臣子，要提出意见已经不容易了，做为君主，要接受意见也很艰难。
时百姓凋匮而役务方殷，觊上疏曰： 夫变情厉性，强所不能，人臣言之既不易，人主受之又艰难。
At that time, the people's life was difficult, but there were many kinds of corvee. Wei Ke said in his memorial: Changing a person's disposition cannot be done by force. As a minister, it is not easy to make suggestions, and as a monarch, it is also difficult to accept suggestions.