《史记·七十列传·鲁仲连邹阳列传》
晋文公亲近他的仇人，就能够在诸侯中称霸；齐桓公任用他原来的仇人，却能使天下纳入正轨。
夫晋文公亲其雠，彊霸诸侯；齐桓公用其仇，而一匡天下。
Duke Wen of Jin embraced his enemies and became hegemon over the feudal lords; Duke Huan of Qi employed his former enemies and put the world in order.