Guns are the crutches of the impotent.

When you finally understand the universe, it will not only be stranger than you imagine, it will be stranger than you can imagine.

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.

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

It was the mark of a barbarian to destroy something one could not understand.

The fact that we have not yet found the slightest evidence for life - much less intelligence - beyond this Earth does not surprise or disappoint me in the least. Our technology must still be laughably primitive, we may be like jungle savages listening for the throbbing of tom-toms while the ether around them carries more words per second than they could utter in a lifetime.

The goal of the future is full unemployment, so we can play. That's why we have to destroy the present politico-economic system.