Everything you’ve ever wanted is on the other side of fear.

学习数学的最好方法就是做数学。

最好的想法往往来自意想不到的地方——保持开放的心态。

No matter how good you get you can always get better, and that's the exciting part.

A legal system is a system of rules which are valid according to the system's own criteria of validity.

力的统一不仅是数学上的梦想，更是物理上的必然。