行有不得者，皆反求諸己

 

 

https://www.epochtimes.com/b5/19/6/7/n11306847.htm

https://www.epochtimes.com/b5/11/1/2/n3130746.htm

 

孟子 -> 離婁上

https://ctext.org/mengzi/li-lou-i/zh