If you want to see what this nation is all about, you have to ride the rails. Look outside as you speed through, and you’ll find the true face of America.

Liberty means responsibility. That is why most men dread it.

The best way to predict the future is to create it.

过去并未死去，它甚至还未过去。

Afghanistan is the land of my past, the place where I had laughed and cried, but it was no longer my home.

可持续性不再是可选项，而是商业的必要条件。

In science, we must be open to the possibility that our most cherished theories could be wrong.