《后汉书·列传·郎顗襄楷列传下》
《易传》说 ：有外表，无实际，口才伶俐的小人。有实际，无外表，有道之君子。 
《易传》曰： 有貌无实，佞人也；有实无貌，道人也。 
The Commentary on the Book of Changes says: There is appearance but no substance, a glib and cunning person. There is substance but no appearance, a virtuous gentleman.