When you are dead, you don’t know that you are dead. It is difficult only for the others.
It is the same when you are stupid.
?、人畢竟只是人,都有侷限,都有蠢,有不自知蠢的時候,以往儒者解救之方,就是往自己的起心動念處做省察改過的工夫,重點是己過,不在他人,所謂慎獨是也,現代的通俗說法便是手指指向己而不向人,而在評論眾人之事時,只是就事,就理而說,而盡量不就人說。反己與論事是兩套終身都要鍛練的工夫,人隨時都有可能出錯,所謂戒慎恐懼是也。