It is also, I should say, on the basis of this letter, which is why I ask people from time to time to remove their caps in the class room, from the House of Study.

也应可以说是因为这封信，促使我总是要求,课堂上的同学摘下鸭舌帽来听课，至少在学习的殿堂里。

耶鲁公开课 - 政治哲学导论课程节选