The world is littered with corpses that predicted technology in a particular arena was done. If there's another gigantic step change out there, we don't yet know what it is.

It's perfectly healthy-encouraged, even- to have an idea tomorrow that contradicted your idea today

What we need to do is always lean into the future; when the world changes around you and when it changes against you - what used to be a tail wind is now a head wind - you have to lean into that and figure out what to do because complaining isn't a strategy.

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

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

Are you lazy or just incompetent?

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.