True progress measures both economic growth and ecosystem health.

Don't be afraid to give up the good to go for the great.

我想被人们记住是一个好人

We think not in isolated ideas, but in continuous streams of purpose-directed activity.

数学中最重要的是提出正确的问题。

关于地精和精灵的观念与黑暗和光明没有任何关系。