We have this handy fusion reactor in the sky called the sun, you don't have to do anything, it just works. It shows up every day.

I think it's important to reason from first principles rather than by analogy. The normal way we conduct our lives is we reason by analogy. [With analogy] we are doing this because it's like something else that was done, or it is like what other people are doing. [With first principles] you boil things down to the most fundamental truths…and then reason up from there.

You should be innovating so fast that you're invalidating your prior patents.

Facebook is quite entrenched and has a network effect. It's hard to break into a network once it's formed.

I don't create companies for the sake of creating companies, but to get things done.

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.

What I'm trying to do is, is to make a significant difference in space flight. And help make space flight accessible to almost anyone.