As you may have guessed, because you have this on your handout, Milton is alluding here to the famous words of the Old Testament prophet Isaiah.

你们可能已经猜到了，因为讲义上都有，弥尔顿在这儿影射到这些,先知艾赛亚旧约里的一些很有名的词。

耶鲁公开课 - 弥尔顿课程节选

This refers to the fact that people- this sounds like something you probably already know but it has been documented by psychologists.

指的是人们...,照字面意思,可能你们已经猜到,心理学家已经证明了这一原理

耶鲁公开课 - 金融市场课程节选