世上没有失败,失败只不过是命运试图将我们推向另一个方向罢了。
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
In mathematics, you don't understand things. You just get used to them.
In bad times, which are coming soon, it is better to die than to live.