对过去的反思是未来的智慧之源。

Art is a wound turned into light.

Just because you like it does not mean that the world will necessarily give it to you.

理智是不朽的，其他一切都是有限的。

年轻人是可怕的，因为怎么能知道他的将来不如我们现在呢？但如果一个人到了四十、五十岁还默默无闻，他也就没有什么可怕的了。

I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.