Every great and deep difficulty bears in itself its own solution. It forces us to change our thinking in order to find it.

我不认为每个人都应该成为数学家，但我确实相信许多学生没有给数学一个真正的机会。

Innovation often comes from rethinking the ordinary.

I always try to be positive, even in difficult moments.

I know that I am intelligent，because I know that I know nothing.

I'm not in competition with anybody but myself. My goal is to beat my last performance.