活着是世界上最罕见的事,大多数人只是存在而已。
To live is the rarest thing in the world. Most people exist, that is all.
最好的投资是投资于那些正在建设未来的人。
The most dangerous art is the kind that makes you think.
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.