《智囊(选录)·术智部·曹冲》
一会儿，马房小厮进来向曹操报告马鞍被老鼠咬坏的事，曹操笑着说： 衣服在人的身边，都会被老鼠咬破，更何况是挂在柱子上的马鞍呢。 
公曰： 妄言耳，无苦。 俄而库吏以啮鞍白，公笑曰： 儿衣在侧且啮，况鞍悬柱乎。 
A short while later, the stable boy came in to report that a mouse had gnawed a hole in the saddle. Cao Cao laughed and said, "Even clothes that we wear can get gnawed by mice, let alone a saddle hanging on a post."