In life, people will take you at your own reckoning.

Science can amuse and fascinate us all, but it is engineering that changes the world.

On Earth, we are unmanned by our longing for a pastoral past that never really existed; and that, if it had existed, could never exist again...on the Moon, there is no past to long for or dream about. There is no direction but forward.

How often people speak of art and science as though they were two entirely different things, with no interconnection. That is all wrong. The true artist is quite rational as well as imaginative and knows what he is doing; if he does not, his art suffers. The true scientist is quite imaginative as well as rational, and sometimes leaps to solutions where reason can follow only slowly; if he does not, his science suffers.

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

The great secret of the successful fool is that he's no fool at all

There is no right to deny freedom to any object with a mind advanced enough to grasp the concept and desire the state. -(from "The Bicentennial Man) story)