《论衡·卷五·感虚篇》
太史公说： 世人称赞燕太子丹能使天降谷，马生角，大都是假话。 
太史公曰： 世称太子丹之令天雨粟、马生角，大抵皆虚言也。 
The Grand Historian wrote: People said that Crown Prince Dan of the State of Yan could make the heaven drop cereals and the horse grow horns are all false words. 