The hardest decisions often yield the greatest rewards.

我对蛋糕的政策是支持拥有它并支持吃掉它。

No man really knows about other human beings. The best he can do is to suppose that they are like himself.

实现明天理想的唯一障碍是今天的疑虑。

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.