Entrepreneurship is like eating glass and walking on hot coals at the same time

Land on Mars, a round-trip ticket - half a million dollars. It can be done.

The primary means of energy generation is going to solar. It will at least be a plurality, and probably be a slight majority in the long term.

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

Let's think beyond the normal stuff and have an environment where that sort of thinking is encouraged and rewarded and where it's okay to fail as well. Because when you try new things, you try this idea, that idea... well a large number of them are not gonna work, and that has to be okay. If every time somebody comes up with an idea it has to be successful, you're not gonna get people coming up with ideas.

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?'

Even if producing CO2 was good for the environment, given that we're going to run out of hydrocarbons, we need to find some sustainable means of operating.