Machines can only find what ignorant men have programmed them to find.

The fish that first ventured ashore had considerable practical problems.

It is a truism that the structure of a society is basically determined by its technology. Not in an absolute sense-there may be totally different cultures using identical tools-but the tools settle the possibilities; you can't have interstellar trade without spaceships. A race limited to a single planet, possessing a high knowledge of mechanics but with its basic machines of industry and war requiring a large capital investment, will inevitably tend toward collectivism under one name or another. Free enterprise needs elbow room.

Give fear no hold on you. Keep sinews loose and senses open, ready at every instant to flow with the rush of action.

A fanatic's willingness to kill or be killed in the service of a cause cannot prove the rightness of that cause.

We live with our archetypes, but can we live in them?

Will none wipe the sneer off the face of the cosmos?