《资治通鉴·宋纪·宋纪六》
拓跋焘问崔浩这个想法如何，崔浩回答说： 打蛇的人先打蛇头，头被击坏，尾巴就无法调动了。
以问崔浩，对曰： 夫击蛇者先击其首，首破则尾不能掉。
Tuoba Tao asked Cui Hao what he thought of this idea, and Cui Hao replied: The person who fights the snake will first hit the snake's head. If the head is hit, the tail cannot be moved.