The historian must have a kind of faith that humanity will not and cannot perish.

教育是点燃火焰，而不是填满容器。

We need to design policies that work with human psychology, not against it.

"Time is the thing that keeps everything from happening at once."

As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.

You have to be willing to take risks.