《容斋随笔·卷五·韩信周瑜》
当孙权向周瑜询问破曹操的计策时，周瑜已经说了曹操冒然进军的四种弊端，并说军队已经足够用了，您就看我周瑜怎么大破曹军吧！ 
刘备见瑜，恨其兵少。瑜曰： 此自足用，豫州但观瑜破之。 
When Sun Quan asked Zhou Yu about strategy to defeat Cao Cao, Zhou Yu had already pointed out four of Cao Cao's fatal weaknesses for marching without careful preparation, and said that the army was already sufficiently prepared, so now he could watch Zhou Yu crush the Cao army.