But there is this sort of sense of uncertainty that you see in someone like Descartes, who finally just goes back to basics and says, "I think, therefore I am."

你可以在那个年代从某些人身上,看到一种怀疑的精神,比如笛卡尔,他最终逐本溯源提出"我思故我在"

耶鲁公开课 - 欧洲文明课程节选

Therefore--Where am I going with all this?

那么,告诉你们这些有什么用呢

耶鲁公开课 - 聆听音乐课程节选

I think, therefore I am."

我思故我在"

耶鲁公开课 - 欧洲文明课程节选