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

One of the things that gets me up in the morning is knowing that customer expectations are always rising, and I find that very exciting.

One of the things it was obvious you could do with an online store is have a much more complete selection.

If you can't feed a team with two pizzas, it's too large.

I wanted to project myself forward to age 80 and say, ‘OK, I’m looking back on my life. I want to minimise the number of regrets I have.’ And I knew that when I was 80, I was not going to regret having tried this. I was not going to regret trying to participate in this thing called the Internet that I thought was going to be a really big deal. I knew that if I failed, I wouldn’t regret that. But I knew the one thing I might regret is not ever having tried. I knew that that would haunt me every day.

E-mail has some magical ability to turn off the politeness gene in a human being.

I'm going to go do this crazy thing. I'm going to start this company selling books online.