To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others.

The most powerful tool in science is not technology, but imagination.

弟子不必不如师，师不必贤于弟子。弟子超过老师，是很正常的事情，这也是正是老师所希望的。

The boundaries which divide Life from Death are at best shadowy and vague. Who shall say where the one ends, and where the other begins?

不沉溺于过去，全力以赴面向未来。

那不是好事，也不会有好结果；可是碎了吧，我的心，因为我必须噤住我的嘴！

领导力意味着今天做出艰难的决定，这些决定将使子孙后代受益。

天然气是帮助我们实现低碳未来的桥梁燃料。