《新唐书·列传·卷八十二》
放弃这些策略不用，反而给敌人可乘之机就等于倒拿戈矛，把矛柄送给敌人来杀自己。
舍此不务而反为所乘，斯谓倒持戈矛，以鐏授寇者也。
If we give up these tactics and give the enemy an opportunity to exploit our weaknesses, it will be like giving the enemy a sword and letting him kill us with it.