"The hard part of running a business is that there are a hundred things that you could be doing, and ..." — Sam Altman

I think extreme secrecy is a bad sign in all startups. Very few startups die because they tell you exactly how their technology works. On the long list of startup killers, that's pretty far down. Though on the list of entrepreneur fears, it's pretty high.

Intelligence is usually easy to tell in a 10-minute conversation. Determination is harder.

AI will probably most likely lead to the end of the world, but in the meantime, there'll be great companies.

Whether or not money can buy happiness, it can buy freedom, and that's a big deal. Also, lack of money is very stressful.