Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

每一次失败都离答案更近一步。

And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.

Every quarry has two stories: the rock formation beneath and the community around it. Wise leaders listen to both.

我不是那种会让对牺牲的热爱减少的人。