If liberty means anything at all, it means the right to tell people what they do not want to hear.

The most significant threat to liberal democracy today is not from the outside, but from within.

Twenty years from now, you will be more disappointed by the things you didn’t do than the ones you did.So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover. （注：这句说话被部分人质疑不是由马克·吐温所说的。）

重要的不是金钱，而是你爱的人。

科学不仅是对世界的描述，也是世界的一部分。