《智囊(选录)·兵智部·总序》
天时、地利、敌情都在不断变化之中，因此对敌作战的方法也就各不相同。正是选择了正确方法，因之取得了胜利。
天异时，地异利，敌异情，我亦异势。用势者，因之以取胜焉。
The timing, geographical advantages and enemy situation were ever changing, so the methods used to fight the enemy varied. Victory was achieved precisely because the correct methods were chosen.