《容斋随笔·卷十三·一以贯之》
子贡尽管听到这话，仍不能象曾子那样答 是的 , 范淳父也说： 先否定子贡的失误，然后再把问题的要害告诉他。 
虽闻其言，犹不能如曾子之唯也。 范淳父亦曰： 先攻子贡之失，而后语以至要。 
Although Zigong heard these words, he still could not answer, "Yes" like Zeng Zi. Fan Chunfu also said: First, deny Zigong's mistake, and then tell him the crux of the problem.