《后汉书·列传·张曹郑列传》
班固说 ：京师许多儒生，多能说礼，应该广泛招集，一起议论得失。 
固曰： 京师诸儒，多能说礼，宜广招集，共议得失。 
Ban Gu suggested that many Confucian scholars in the capital were well-versed in matters of etiquette, and he proposed gathering them to discuss the topic.