国际体系本质上是竞争性的，国家不断试图互相超越。

If you take care of the soil, the soil will take care of you.

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.

在我的一生中，大自然的新景象让我像孩子一样欢喜。

"In business, timing is everything."

我唯一感兴趣的艺术是能改变人们看待世界方式的艺术。