Invert, always invert: Turn a situation or problem upside down.Look at it backward.

晏子春秋

最好的领导者是那些多听少说并以诚信行事的人。

We are all of us made by what we have lost as much as by what we have gained.

翻译：所以不完全了解用兵的危害，就不能完全了解用兵的好处。