This study considers Xunzi's criticism of Zisi, Confucius' grandson, providing a detailed analysis of some of the most famous but also difficult passages in the Xunzi. By drawing on the newly excavated text, “Wuxing” (The five conducts), the study shows that not only did Xunzi have an intimate knowledge of Zisi's teachings, but in fact he had available to him a certain version of the “Wuxing.” This understanding makes it possible to evaluate Xunzi's role as a reporter of Zisi's teachings, and to the extent that Xunzi reported these teachings fairly and accurately, the study offers specific suggestions for reimagining a period that has been little understood in Early Chinese intellectual history, or the transition from Confucius to Mencius.