"I'm a big believer in a multi-planetary species. I think it's important for the long-term survival of humanity."

"The problem with humanity is that it's just so damn hard to get rid of."

"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."

"It's like, how often do you get to invent a car company? Or a rocket company? Or a tunneling company?"

"I'm not a fan of people who are not resilient. I think it's important to be resilient and bounce back from setbacks."