生活要朴素，情操要高尚。

Words were not given to man in order to conceal his thoughts.

A good world needs knowledge， kindliness， and courage； it does not need a regretful hankering after the past or a fettering of the free intelligence by the words uttered long ago by ignorant men.

I am interested in the human condition, in what it means to be alive, in the nature of existence.

数学是人类精神最美丽、最强大的创造。