《资治通鉴·汉纪·汉纪五十五》
而且曹操善于用兵，变化无穷，兵马虽少，却不可轻视。现在，不如按兵不动，与他相持。
且操善用兵，变化无方，众虽少，未可轻也，今不如以久持之。
Moreover, Cao Cao is adept at war, and his tactics are infinite. Although he has fewer troops, he should not be underestimated. For now, we should stay where we are and hold out against him.