数学的本质在于它的自由。

Fame is not the most important thing in life. The most important thing is to be happy.

我不是红脖子议程的一部分

The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

A book is a version of the world. If you do not like it, ignore it; or offer your own version in return.