zhòng yào cuò wù dāng rán yào jí shí shuō dàn néng sī xià shuō de jiù bié ràng duì fāng gān gà

重要错误当然要及时说，但能私下说的，就别让对方尴尬。

Important mistakes should of course be pointed out in time, but if you can say them privately, don't embarrass the other person.