The best way to learn mathematics is to do mathematics.

Alittle sincerity is a dangerous thing, and a great deal of it is absolutely fatal.

I find I'm so excited. I can barely sit still or hold a thought in my head. I think it the excitement only a free man can feel, a free man at the start of a long journey whose conclusion is uncertain. I hope I can make it across the border.I hope the Pacific is as blue as it has been in my dreams. I hope to see my friend, and shake his hand. I hope.

The unity of mathematics is not an illusion but a reality waiting to be uncovered.

It's easy to perform for others, but hard to perform for yourself.

跨部门合作对于在减排方面取得有意义的进展至关重要。