永远不要停止学习，因为世界永远不会停止变化。

真相往往藏在最简单的事物中。

To be or not to be,that's a question.

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.