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.
Customer loyalty is earned, never given.
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.