《司马法·天子之义》
大败之后不执行惩罚，上下都会认为错误是在自己。上级如果认为错误在自己，必定决心改正错误，下级如果认为错误在自己，必定决心不再犯错误。
大败不诛，上下皆以不善在己，上苟以不善在己，必悔其过，下苟以不善在己，必远其罪。
After a great defeat, no punishment should be carried out, so that both the superior and the subordinate will believe that the mistake is their own. If the superior believes that the mistake is their own, they will definitely be determined to correct it; if the subordinate believes that the mistake is their own, they will definitely be determined not to make it again.