《淮南子·兵略训》
所谓 五行 是指将帅能柔软但不卷曲，能刚强但不折断，秉仁慈但不可侵犯，有信誉但不容欺骗，具勇敢但不可凌辱。
所谓五行者：柔而不可卷也，刚而不可折也，仁而不可犯也，信而不可欺也，勇而不可陵也。
The so-called "Five Elements" refers to the ability of generals to be soft but not curled up, to be tough but not broken, to have compassion but not to be violated, to have reputation but not to be deceived, and to be brave but not to be humiliated.