"The future of space exploration is not just about going to the Moon, it's about going to Mars and beyond."

"I believe that every human has a finite number of heartbeats. I don't intend to waste any of mine running around doing exercises."

"I think the one thing that we are not doing enough today is encouraging young people to take risks."

"I wasn't chosen to be first. I was just chosen to command that flight. Circumstance put me in that particular role."

"The unknowns were many, but our confidence was high."