When you start describing the significance of a symbol like the tunnel, which recurs in the book, you immediately begin to limit it, and a symbol should go on deepening.

当你开始描述一个象征的意义,比如说在书中，反复出现的隧道，当你一开始予以限制，这个象征就会继续深化。

耶鲁公开课 - 1945年后的美国小说课程节选