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

The only reason I was able to accomplish things is the great people willing to work with me. A company is a group of people organized to create a product or service, and that product or service is only as good as the people in the company - and how excited they are about creating it. I do want to recognize a ton of super-talented people. Without them, I would have accomplished very little. I just happen to be the face of the companies.

The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It'll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn't been reusable.

We have a strict 'no a-hole policy' at SpaceX. And we fire people they are. I mean, we give them a little bit of warning. But if they continue to be an a-hole, then they're fired.

It's obviously tricky to convert cellulose to a useful biofuel. I think actually the most efficient way to use cellulose is to burn it in a co-generation power plant. That will yield the most energy and that is something you can do today.

If we drive down the cost of transportation in space, we can do great things.

I think that's an important thing to do, to really pay attention to negative feedback, and solicit it, particularly from friends. This may sound like simple advice, but hardly anyone does that, and it's incredibly helpful.