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.

团队的力量在于思想的多样性和目标的统一性。

数学是一种思维方式，而不仅仅是一堆事实。

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.