In order for us to have a future that's exciting and inspiring, it has to be one where we're a space-bearing civilization.

I do love email. Wherever possible I try to communicate asynchronously. I'm really good at email.

You want to have a future where you’re expecting things to be better, not one where you’re expecting things to be worse.

I think it matters whether someone has a good heart.

Engineering is the closest thing to magic that exists in the world.

Don’t just follow the trend. You may have heard me say that it’s good to think in terms of the physics approach of first principles. Which is, rather than reasoning by analogy, you boil things down to the most fundamental truths you can imagine and you reason up from there.

I think we should be very careful about artificial intelligence. If I had to guess at what our biggest existential threat is, it's probably that. So we need to be very careful...With artificial intelligence we're summoning the demon.