Every day confirms his belief of the inconsistency of all human characters, and of the little dependence that can be placed on the appearance of merit or sense.

To enjoy freedom we have to control ourselves.

The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

I believe that love is a better teacher than the sense of duty， he said， at least for me.

Collaboration is key—no great science is done in isolation.

解释：众人的愤怒不可触犯，个人专权的欲望难以成功。

唯一比被人谈论更糟糕的事就是没人谈论你。

我们所相信的观念，并非是事物真实的本质，而只是它们表面的样貌。