《论衡·卷十六·讲瑞篇》
孔子死后，弟子们一起推有若坐在孔子的座位上，向他请教先王之道及礼仪，有若不能问答，是什么原因呢？
孔子死，弟子共坐有若，问以道事，有若不能对者，何也？
After Confucius passed away, the disciples all pushed You Ruo to sit on Confucius’s seat to ask him about the way of the old kings and etiquette. But You Ruo was unable to answer their questions. Why was that?