《史记·七十列传·商君列传》
赵良说： 能够听从别人的意见叫做聪，能够自我省察叫做明，能够自我克制叫做强。
赵良曰： 反听之谓聪，内视之谓明，自胜之谓强。
Zhao Liang said: To be able to listen to others' opinions is called clever, to be able to introspect is called bright, to be able to control oneself is called strong.