当你写作时，你试图发现一些你不知道的东西。
The value of all things contracted for, is measured by the appetite of the contractors.
A theory should not attempt to explain all the facts, because some of the facts are wrong.
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.
