The artist must be a researcher, constantly experimenting and exploring new possibilities.

在桂林学界迎会的演说，1922年1月22日

对于只有一把锤子的人来说，每个问题看起来都像是钉子。

"Take calculated risks. That is quite different from being rash."

"Humor is the best way to connect with kids."

You can't get to the top by being nice.

The most exciting moments in mathematics are when you realize that two seemingly unrelated areas are deeply connected.

最伟大的冒险发生在脑海中。