When you are young spend at least 6 months to one year living as poor as you can， owning as little as you possibly can， eating beans and rice in a tiny room or tent， to experience what your “worst” lifestyle might be. That way any time you have to risk something in the future you won’t be afraid of the worst case scenario.

The essence of mathematics lies in its freedom.

对于有知识的人来说，言语是最好的展示。

数学的力量在于它的抽象性，使我们能够看到不立即显现的模式和联系。

The only way to make sense out of change is to plunge into it, move with it, and join the dance.

The information gap is harder to bridge than the wealth gap.