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

Persistence is very important. You should not give up unless you are forced to give up.

Going from PayPal, I thought: 'Well, what are some of the other problems that are likely to most affect the future of humanity?' Not from the perspective, 'What's the best way to make money?'

There's a real opportunity to have a vertical takeoff and landing electric supersonic jet.

The tough thing is figuring out what questions to ask, but […] once you do that, the rest is really easy.

Nobody wants to buy a $60,000 electric Civic. But people will pay $90,000 for an electric sports car.

If you go back back a few hundred years, what we take for granted today would seem like magic - being able to talk to people over long distances, to transmit images, flying, accessing vast amounts of data like an oracle. These are all things that would have been considered magic a few hundred years ago.