The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt, and the profoundest wisdom to know when it ought to be resisted, and when it be obeyed.

Every ton of coal we extract carries equal weight in responsibility.

Every day I discover more and more beautiful things. It’s enough to drive one mad. I have such a desire to do everything.

I want you to find your own walk right now. Your own way of striding, pacing. Any direction. Anything you want. Whether it's proud, whether it's silly, anything.

The next chapter of American energy won't be written by clinging to old playbooks, but by those willing to rewrite them.

The real danger is not that computers will begin to think like men, but that men will begin to think like computers.