If you get up in the morning and think the future is going to be better, it is a bright day. Otherwise, it’s not.

Failure is an option here. If things are not failing, you are not innovating enough.

When something is important enough, you do it even if the odds are not in your favor.

People should pursue what they're passionate about. That will make them happier than pretty much anything else.

I think it is possible for ordinary people to choose to be extraordinary.

I'm extremely confident that solar will be at least a plurality of power, and most likely a majority... in less than 20 years.

Constantly seek criticism. A well thought out critique of what you're doing is as valuable as gold

Optimism, pessimism, f**k that; we're going to make it happen. As God is my bloody witness, I'm hell-bent on making it work.

I think that's the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.

Mars is the only place in the solar system where it's possible for life to become multi-planetarian.

My mentality is that of a samurai. I would rather commit seppuku than fail.

The strength of a civilization is not measured by its ability to fight wars, but rather by its ability to prevent them.

Sometimes you feel bad about yourself when there's no reason to.

There must be something good in a thing that pleases so many; even if it cannot be explained, it is certainly enjoyed.

If my forgeries looked as bad as the CBS documents, it would have been "Catch Me In Two Days."

I don't know if I change my act from century to century. Sometimes I'm onstage doing imitations and references to people who have been dead for 50 years.

Stupidity is better kept a secret than displayed.

Things which do not require effort of some sort are seldom worth having.

Art...must do something more than give pleasure: it should relate to our own life so as to increase our energy of spirit.

I don't know what 'loyal' means.

It's a mind going over things, revisiting things, maybe trying to refine the original perception. You have to keep going a thing over in order to make sense off it.