Mediocre theoretical physicists make no progress. They spend all their time understanding other people's progress.

We've got thousands of investors counting on us. And we're a team of thousands of employees all counting on each other. That's fun.

It’s very important for entrepreneurs to be realistic. So if you believe on that first day while you’re writing the business plan that there’s a 70 percent chance that the whole thing will fail, then that kind of relieves the pressure of self-doubt.

We are our choices. Build yourself a great story.

You're not going to make Hemingway better by adding animations.

You have to use your judgment. In cases like that, we say, 'let's be simple minded. We know this is a feature that's good for customers. Let's do it.

Entrepreneurs must be willing to be misunderstood for long periods of time.