If you get up in the morning and think the future is going to be better, it is a bright day. Otherwise, it’s not.

The key test for an acronym is to ask whether it helps or hurts communication.

People should pursue what they're passionate about. That will make them happier than pretty much anything else.

If you had to buy a new plane every time you flew somewhere, it would be incredibly expensive.

The biggest mistake, in general, I've made, is to put too much of a weighting on someone's talent and not enough on their personality. And I've made that mistake several times. I think it actually matters whether somebody has a good heart, it really does. I've made the mistake of thinking that it's sometimes just about the brain.

Physics is really figuring out how to discover new things that are counterintuitive, like quantum mechanics. It's really counterintuitive.

I don't create companies for the sake of creating companies, but to get things done.