I think there would be no shortage of applicants to the government astronaut corps to be settlers on the planet Mars. And I think this would be very inspiring.

To me, money is a commodity that a person must have to function, not a goal in itself.

Dwelling on an engine failure for a pilot as he rolls down the runway is NOT what he should be thinking about - it's obtaining a smooth liftoff! But in the back of his mind, he knows exactly what to do (or pretty much) and in many cases, if he's alone in the fighter aircraft, he has to leave that aircraft in an ejection seat in a big hurry!

Neil Armstrong was the first man to walk on the moon. I am the first man to piss his pants on the moon.

Knowledge of the past and an optimistic view of the present give you great opportunities.

It's been one of the greatest challenges that ever came along in my life; it was one of the more difficult things to do.

At the core of the risk-free society is a self-indulgent failure of nerve.