The most important thing is to be willing to question everything.

我曾经受苦过，曾经失望过，曾经体会过“死亡”，于是我以我在这伟大的世界里为乐。

We are all of us made by what we have lost as much as by what we have gained.

学习数学的唯一方法就是做数学。

通往成功的道路总是在建设中。