《史记·七十列传·张仪列传》
我听说过，军事力量比不上别国强大，就不要挑起战争；粮食比不上人家多，就不要持久作战。
臣闻之，兵不如者勿与挑战，粟不如者勿与持久。
I’ve heard of this saying: if your military strength is not strong enough, you shouldn’t start a war; if your granary is not full, you shouldn’t engage in a protracted war.