《魏书·列传·卷四十一》
如打造舟船，必须停顿，军队疲乏，粮食缺少，进退就很困难，正视困难回撤军马，这在目前是最合礼义的做法。 
若营舟楫，必须停滞，师老粮乏，进退为难，矜丧反旆，于义为允。 
 If we were to build ships, we would have to halt our advance, the army would become exhausted, and supplies would dwindle. Advancing or retreating would become difficult. Facing these difficulties and withdrawing our troops is the most appropriate course of action given the current circumstances.