I think in the long run the money that s been put into the space program is one of the best investments this country has ever made . . .This is a downpayment on the future of mankind. It's as simple as that.

Don't mess up the environment until you're quite sure what you're doing.

Anything that is theoretically possible will be achieved in practice, no matter what the technical difficulties are, if it is desired greatly enough.

No communication technology has ever disappeared, but instead becomes increasingly less important as the technological horizon widens.

You can't have it both ways. You can't have both free will and a benevolent higher power who protects you from yourself.

As his body became more and more defenseless, so his means of offense became steadily more frightful.

One can imagine a time when men who still inhabit organic bodies are regarded with pity by those who have passed on to an infinitely richer mode of existence, capable of throwing their consciousness or sphere of attention instantaneously to any point on land, sea, or sky where there is a suitable sensing organ. In adolescence we leave childhood behind; one day there may be a second and more portentous adolescence, when we bid farewell to the flesh.