In a startup, absolutely nothing happens unless you make it happen.

The difference between a vision and a hallucination is that other people can see the vision.

In the startup world, you're either a genius or an idiot. You're never just an ordinary guy trying to get through the day

I've been an entrepreneur three times. I started three companies.

Big breakthrough ideas often seem nuts the first time you see them.

I hope to someday live in a world where there are lots more Silicon Valleys.

Breakthrough ideas look crazy, nuts. It’s hard to think this way — I see it in other people’s body language, and I can feel it in my own, where I sometimes feel like I don’t even care if it’s going to work, I can’t take more change. O.K., Google, O.K., Twitter—but Airbnb? People staying in each other’s houses without there being a lot of axe murders?