The essence of liberty is the ability to pursue one’s own goals without arbitrary interference from others.

旅行就是发现每个人对其他国家的看法都是错误的。

你必须充满期待。你必须沉浸在希望之中。

You cannot always control what goes on outside. But you can always control what goes on inside.

Great leaders don't create followers; they create more leaders.

A mathematician's work is never done; there are always more problems to solve.

"We are what we pretend to be, so we must be careful about what we pretend to be."

自己不愿干的，不要强加给别人。