《韩非子·外储说左上》
左右壁垒的军队都松懈了下来，不再相信李悝，过了几个月，秦人前来袭击他们，打起来后，几乎消灭李埋全军，这是不讲信用的祸害。
居数月，秦人来袭之，至几夺其军。此不信患也。
The armies with ramparts on the left and right both relaxed, and no longer believed Li Kui. Several months later, the Qin forces came to attack them, and after fighting, almost annihilated Li Kui's entire army; this was the disaster of breaking trust.