定理当然是数学的永久财富。

A mathematician is a device for turning coffee into theorems.

Writing is a way of being in the world, a way of understanding it.

There is a close connection between the human soul and the natural world; our emotions are intertwined with the external universe.

活着就是受苦，生存就是在苦难中找到某种意义。

爱国不是选择，而是责任。