The reason we should do a carbon tax is because it's the right thing to do. It's economics 101, elementary stuff.

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.

Many much-learned men have no intelligence.

Spoken words are like seeds that we plant which will eventually grow into something sweet or bitter. Our actions in this life are seeds we're planning for the other life promised by Allah.

The potential of the psychedelic drugs to provide access to the interior universe, is, I believe, their most valuable property.

But if you can find that spot - I suppose it's like running - I used to be a swimmer and swim laps, and you just have to be there with what you're doing.

There is a great difference between worry and concern. A worried person sees a problem, and a concerned person solves a problem.

The press is like a woman: sublime when it lies, it will not let go until it has forced you to believe it. The public, like a foolish husband, always succumbs.

Why is humanism not the preeminent belief of humankind?

People like me sound like a lot of big cannons.

It could be my British need for discipline that makes me admire the American appetite for freedom and passion.

I don't think there's a petty system of heaven and hell. The love of God is much more forgiving. I'm not a believer in a wrathful God at all.