《汉书·传·赵充国辛庆忌传》
臣听兵法说 进攻力量不足的，进行防守则会绰绰有余 ，又说 善于战斗的人控制别人，不被别人所控制 。
臣闻兵法 攻不足者守有余 ，又曰 善战者致人，不致于人 。
I have heard the art of war say: "Those who are not strong enough to attack will have more than enough to defend themselves." It also says, "Those who are good at fighting control others and are not controlled by others."