《史记·七十列传·卫将军骠骑列传》
武帝曾想教他孙子和吴起的兵法，他回答说： 战争只看方针策略如何就行了，不必学习古代兵法。 
天子尝欲教之孙吴兵法，对曰： 顾方略何如耳，不至学古兵法。 
Emperor Wu once wanted to teach him the military strategies of Sun Tzu and Wu Qi, but he replied: In war, it is only necessary to consider strategies, and it is not necessary to study ancient military strategies.