《孔子家语·颜回》
我听先生说： 谈论别人缺点，并不能美化自己；谈论别人的错误，并不能使自己正确。 
吾闻诸孔子曰： 言人之恶，非所以美己；言人之枉，非所以正己。
I have heard my master say: By speaking about other people’s faults, you do not make yourself good; by speaking about other people’s wrongs, you do not make yourself right.