《黄帝四经·十大经·五正》
阉冉回答说：如果您还不能充分认识自己，便可以姑且隐匿起来，先做到自我完善。
对曰：后身未自知，乃深伏于渊，以求内刑。
Yan Ran responded: If you have not yet fully understood yourself, you can retreat to solitude for the time being and perfect yourself.