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.

A faith that cannot survive collision with the truth is not worth many regrets.

I don't believe in astrology; I'm a Sagittarius and we're skeptical.

We over estimate technology in the short term and under estimate technology in the long term.

The crossing of space ... may do much to turn men's minds outwards and away from their present tribal squabbles. In this sense, the rocket, far from being one of the destroyers of civilisation, may provide the safety-value that is needed to preserve it.

Behind every man now alive stand thirty ghosts, for that is the ratio by which the dead outnumber the living.

We stand now at the turning point between two eras. Behind us is a past to which we can never return...