《吴子·论将》
吴子说： 一般说作战最重要的是，首先探知敌将是谁，并充分了解他的才能。根据敌人情况，采取权变的方法，不费多大力气，就可取得成功。
吴子曰： 凡战之要，必先占其将而察其才，因形用权，则不劳而功举。
Wuzi said: What is generally most important in battle is, firstly, to ascertain who the enemy general is, and to understand his abilities. According to the enemy situation, one should take the expedient way, without expending too much effort, and one can be successful.