I'm reasonably optimistic about the future, especially the future of the United States - for the century, at least.

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.

Free your life from the fangs of gossips by not associating yourself with them. Anyone who helps you to gossip about someone can also help someone to gossip about you.

We know the human brain is a device to keep the ears from grating on one another.

If you are bitter, you are like a dry leaf that you can just squash, and you can get blown away by the wind. There is much more wisdom in forgiveness.

Everything that happens to me can help me along in my Christian life.

Dedicated to my brother Richard with all my heart.

A people without a heritage are easily persuaded.

I grew up near King's Cross station in London, living in an apartment block where my dad was a caretaker.

Unsung, the noblest deed will die.

I was very lucky. My parents raised me in such a way that it never occurred to me that I wasn't equal

All that we do outwardly is but the expression and completion of our inward thought. To work effectively, we must think clearly; to act nobly, we must think nobly.