Life is about making an impact, not making an income.

To be a good mathematician, you need to have both intuition and rigor.

写作就是直面过去的幽灵，并赋予它们在当下的声音。

组合数学就像是不用实际计数的计数艺术。

一般来说，嫉妒、怨恨和自怜都是灾难性的思想模式。自怨自艾与偏执狂相当接近，而偏执狂是最难扭转的。

Turn up the love

When I approach a child, he inspires in me two sentiments; tenderness for what he is, and respect for what he may become.

世界的历史不过是自由观念的发展史。