The greatest tragedy in mankind's entire history may be the hijacking of morality by religion.

Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

My favourite definition of 'Intellectual' is: 'A person whose education surpasses their intelligence.'

This is the first age that's ever paid much attention to the future, which is a little ironic since we may not have one.

There is hopeful symbolism in the fact that flags do not wave in a vacuum.

The intelligence of the planet is constant, and the population is growing.

The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.

Science can destroy religion by ignoring it as well as by disproving its tenets. No one ever demonstrated, so far as I am aware, the non-existence of Zeus or Thor— but they have few followers now.

I'm sure the universe is full of intelligent life. It's just been too intelligent to come here.

I don't believe in God but I'm very interested in her.

Any sufficiently advanced technology is indistinguishable from magic. Clarke's Third Law

The dinosaurs disappeared because they could not adapt to their changing environment. We shall disappear if we cannot adapt to an environment that now contains spaceships, computers — and thermonuclear weapons.

Perhaps our role on this planet is not to worship God — but to create Him.

Any teacher that can be replaced by a machine should be!

Politicians should read science fiction, not westerns and detective stories.

It has yet to be proven that intelligence has any survival value.

I don't believe in astrology; I'm a Sagittarian and we're sceptical.

CNN is one of the participants in the war. I have a fantasy where Ted Turner is elected president but refuses because he doesn't want to give up power.

Behind every man now alive stand 30 ghosts, for that is the ratio by which the dead outnumber the living.