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.

爱情不是终日彼此对视，爱情是共同瞭望远方，相伴而行。

The future is something we can shape, not just something that happens to us.

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

一本好书是我生命中的一个事件。