《汉书·传·匡张孔马传》
你有什么可疑虑的，以致屡次请求辞职，是忘记了我们的师徒关系，还是回避什么流言蜚语？
君何疑而数乞骸骨，忽忘雅素，欲避流言？
What are your concerns that have made you repeatedly ask to resign? Have you forgotten about our teacher-student relationship, or are you avoiding some rumors?