You can't just ignore spacewalking suit; it partially defines the experience. So maybe the most difficult thing is becoming completely attuned to efficiently wearing a garment that is so inhibiting to motion, and making it look effortless, as if it's the most natural thing to be out there on a spacewalk.

I've had a chance to fly a lot of different airplanes, but it was nothing like the shuttle ride.

The danger is different from the fear. ... [practice] what to do if things go wrong, as well as right.

It’s not enough to shelve your own competitive streak. You have to try, consciously, to help others succeed.

In my experience, fear comes from not knowing what to expect and not feeling you have any control over what’s about to happen. When you feel helpless, you’re far more afraid than you would be if you knew the facts.

Doing a space walk. It is one of the most rare human experiences. To leave your spaceship and go outside, so that you are alone in the universe with Earth distant and the universe around you. That is amazing.

The Moon has given us months, tides and a destination that ever-beckons. It's time we build a rocket and go to stay.