The single thing which makes any man happiest is the realization that he has worked up to the limits of his ability, his capacity. It's all the better, of course, if this work has made a contribution to knowledge, or toward moving the human race a little farther forward.

In flying, the probability of survival is inversely proportional to the angle of arrival.

I believe that the message of Apollo XI was that in the spirit of Apollo, a free and open spirit, you can attack a very difficult goal and achieve it, if you can all agree and work together to achieve that goal.

I think we're going to the moon because it's in the nature of the human being to face challenges. It's by the nature of his deep inner soul... we're required to do these things just as salmon swim upstream.

I'm one of the more positive cats, but when people go off about everybody wanting to be a DJ, I don't doubt them either. I understand their point as well.

Fear is not an unknown emotion to us.

Houston, Tranquillity Base here. The Eagle has landed.