A proof is a way to convince yourself and others that something is true.

What I remember above all about Harvard was being in the midst of so much energy and intelligence. It could be exhilarating, intimidating, sometimes even discouraging, but always challenging. It was an amazing privilege…and though I left early, I was transformed by my years at Harvard, the friendships I made, and the ideas I worked on.

人生即使有百年之期，但夭折、长寿、困厄或通达都无法预先知道。

数学中最深刻的见解往往来自最抽象的理论。