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.

Geologists have a saying - rocks remember.

The regret on our side is, they used to say years ago, we are reading about you in science class. Now they say, we are reading about you in history class.

The important achievement of Apollo was demonstrating that humanity is not forever chained to this planet, and our visions go rather further than that, and our opportunities are unlimited.

If you don't know who you are, a university is an expensive place to find out.

Here men from the planet Earth first set foot upon the Moon. July 1969 AD. We came in peace for all mankind.

It's a great thing for a man to walk on the moon. But it's a greater thing for God to walk on the earth.