《尉缭子·战权》
我去进攻敌人，敌人必然要反击，敌人来进攻我们，我们也必然要反击。不是我战胜敌人，就是敌人战胜我，这是战争的客观规律。
凡我往则彼来，彼来则我往，相为胜败，此战之理然也。
I will attack the enemy, the enemy will definitely fight back, the enemy will attack us, we will also definitely fight back. Either I defeat the enemy, or the enemy defeats me, this is the objective law of war.