《淮南子·兵略训》
因此部队中官兵亲如父子兄弟，敌人就无法与之相斗的，因为这样的部队君王将帅平时就爱兵如子的。
是故父子兄弟之寇，不可与斗者，积恩先施也。
Therefore, in the army, officers and soldiers are as close as father and son, brothers, and the enemy cannot fight against them, because such troops are loved by the king and the generals like sons in peacetime.