I'm a Silicon Valley guy. I just think people from Silicon Valley can do anything.

I'm extremely confident that solar will be at least a plurality of power, and most likely a majority... in less than 20 years.

The first step is to establish that something is possible; then probability will occur.

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

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?'

I came to the conclusion that we should aspire to increase the scope and scale of human consciousness in order to better understand what questions to ask. Really, the only thing that makes sense is to strive for greater collective enlightenment.

The space shuttle was often used as an example of why you shouldn't even attempt to make something reusable. But one failed experiment does not invalidate the greater goal. If that was the case, we'd never have had the light bulb.