"The rumor that I'm building a spaceship to get away from my problems is completely false. I have no problems."

"I think we should be pushing the boundaries of what's possible."

"I think that we're going to see a lot of really amazing things happen in the next 20 years."

"I would like to die on Mars. Just not on impact."

"I think the most important thing is to make sure that we have a path to a sustainable energy future, and to become a multi-planet species."