《陈书·列传·卷十八》
十五岁那年，且至逗被召补为国子学生，随即在国学裹讲解《周易》，儒生们都学习和撰述他的见解。
十五，召补国子生，仍于国学讲《周易》，诸生传习其义。
At the age of fifteen, Zhi Di was selected to be a student at The National Academy, and immediately began teaching the Yijing at the National Academy, and the academics all studied and wrote down his ideas.