《后汉书·列传·马援列传》
马援对姐姐的儿子曹训说 ：王氏，现在是垮了台的家族，子石当隐居自守，现在他反而与京师权贵交游，用气自行其是，多有凌人之举，以后必败。 
援谓姊子曹训曰： 王氏，废姓也。子石当屏居自守，而反游京师长者，用气自行，多所陵折，其败必也。 
Ma Yuan said to his sister's son Cao Xun: The Wang family is now a fallen family, Zishi should go into hiding so as to protect himself, now he makes friends with powerful people in the capital, acting on his own accord, he often trespasses against others, he will definitely come to ruin in the future.