"If you buy a ticket to Mars, you're buying a one-way ticket. There's no return. It's a very difficult journey. You may die. You may die on the way there. You may die after you get there. You'll probab…"

"If something is important enough, even if the odds are against you, you should still do it."

"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 passionate. I think it's important to be passionate about what you do."

"I'm not trying to be a superhero. I'm just trying to do what I think is right."