《孟子·尽心章句上·第四十三节》
公都子说： 滕更在您门下的时候，好像是属于以礼待人的那种人，可是您却不回答他的询问，这是为什么？ 
公都子曰： 滕更之在门也，若在所礼。而不答，何也？ 
Gongduzi said: When Teng Geng was under your tutelage, he seemed to be one of those who attached great importance to propriety and rules, yet you did not answer his questions. Why was that?