I think in my twenties I tended to think of all people as sort of more or less alike. In now think that people are really different in all these subtle ways that are very important.

Twitter is hard to evaluate. They have a lot of potential. It's a horribly mismanaged company — probably a lot of pot-smoking going on there. But it's such a solid franchise it may even work with all that.

What important truth do very few people agree with you on?

A company does better the less it pays the CEO.

I do think Bitcoin is the first [encrypted money] that has the potential to do something like change the world.

We need more pessimism that the future might be a lot worse, and we need more optimism that the future might be better.

If you have technological progress, that will encourage more capitalist system. On the other hand, if you don't, if things are stalled, you end up with much more of a zero sum type thing, where there's no progress and basically everybody's gain is somebody else's loss.