"The past is a foreign country; they do things differently there."

不要看时钟；做它所做的。继续前进。

The most important thing is to keep your mind active.

《三民主义.民生主义》（1924年8月10日）

阅读的习惯是唯一没有掺杂任何杂质的享受；当所有其他乐趣消失时，它依然存在。

I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.

Thank God, under our Constitution there was no connection between church and state.