The worst evils in history have always been committed by those who truly believed they were combating evil. Beware of combating evil.
历史上最坏的罪恶往往都来自那些自以为是在打击罪恶的人。留心自己打击罪恶的想法。
如果名分不正理论上便讲不通,理论上讲不通,事情便办不成;……因此,君子给某种事物起名字时,就一定要在理论上讲得通,在实践上就一定能行得通。
解释:比喻能很快地接受别人良好的建议。