《吕氏春秋·纪·仲秋纪》
或是我们从敌人那里获得生存，或是敌人从我们逸里获得生存，这其中的道理难道不该仔细研究吗？
夫得生于敌，与敌得生于我，岂可不察哉？
Either we win our existence from the enemy, or the enemy wins its existence from us. Should we not study carefully the principles involved in this?