Sanity is madness put to good uses; waking life is a dream controlled.

The mind is not, I know, a highway but a temple, and its doors should not be carelessly left open.

What is outside my mind means nothing to it.

The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body.

Not all heads have a brain.

Any man could, if he were so inclined, be the sculptor of his own brain.

Brains are the only things worth having in this world.

To be too conscious is an illness—a real thoroughgoing illness.

Your mind’s got to eat, too.

The human mind is an evolutionary product, just like the human body.

The mind of man is capable of anything.

Every thought is, strictly speaking, an afterthought.

The real question is not whether machines think but whether men do.