There's a fundamental difference, if you sort of look into the future, between a humanity that is a space-faring civilization, that's out there exploring the stars...compared with one where we are forever confined to Earth until some eventual extinction event.

When Henry Ford made cheap, reliable cars people said, 'Nah, what's wrong with a horse?' That was a huge bet he made, and it worked.

You want to be extra rigorous about making the best possible thing you can. Find everything that's wrong with it and fix it.

Many things are improbable, only a few are impossible.

When I was in college, I wanted to be involved in things that would change the world.

I feel very strongly that SpaceX would not have been able to get started, nor would we have made the progress that we have, without the help of NASA.

What I'm trying to do is to maximise the probability of the future being better.