Prediction is very difficult, especially about the future.

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.

罗马大军入侵时，阿基米德的家遭士兵破门而入，他还在醉心研究圆形，后来他被士兵杀害。及后，杀阿基米德的士兵也被处决。

Help people anyway。

Safety isn't just a policy, it's a culture that starts at the top.

"Travel is fatal to prejudice, bigotry, and narrow-mindedness."