《智囊(选录)·明智部·管仲》
齐桓公又说： 卫公子启方服侍我已经有十五年了，他父亲死的时候他都不愿意回去哭丧，难道还可以怀疑吗？ 
公又曰： 卫公子启方事寡人十五年矣，其父死而不敢归哭，犹尚可疑耶？ 
Duke Huan of Qi said again: Wei Gongzi Qi Fang has served me for fifteen years, and when his father died he was unwilling to go back and mourn, can he still be doubted?