《智囊(选录)·杂智部·韩昭侯 子之》
子之为燕相时，一天坐在厅堂上故意说： 刚才在门外一闪而逝的是一匹白马吗？ 
子之相燕，坐而佯言曰： 走出门者何白马也。 
When you were the Prime Minister of Yan, you were sitting in the hall one day and said intentionally: Was that a white horse that just flashed past outside the door?