You have enemies? Good. That means you've stood up for something, sometime in your life.

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

There are no shortcuts to excellence.

说话不符合事实，是一种罪过

我不需要任何人来完整我，我自己就能完整自己。

The secret of being miserable is to have leisure to bother about whether you are happy or not.

数学研究是一次进入未知的旅程，每一次发现都为新的谜题打开了大门。