梦是愿望和恐惧相遇的地方。当愿望和恐惧完全平衡时，你称这个梦为噩梦。

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.

学习数学的唯一方法就是做数学。

数学和物理学之间的相互作用是宇宙的舞蹈，由自然法则编排。

成功的关键是专注于目标，而不是障碍。

When someone makes a decision, he is really diving into a strong current that will carry him to places he had never dreamed of when he first made the decision.