Freedom is not the power to do what we want， but the right to do what we ought.
自由不是做我们想做的事情的权力，而是做我们应该做的事情的权利。
The great philosophers are those who have made a difference in the way we think about the world and our place in it.
失败是成功之母。但重要的是从失败中学到什么。