《汉书·志·五行志中之下》
作战而不了解敌人的力量，这叫做有负于君命，由之导致天寒，虽然有雨作物也不茂盛。
战不量敌，兹谓辱命，其寒虽雨物不茂。
Fighting without understanding the enemy's strength is called failing the emperor's order, resulting in cold weather during which crops do not thrive even with rain.