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

Madness need not be all breakdown. It may also be breakthrough.

The mind of man is capable of anything.

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

Imagination is the secret and marrow of civilization. It is the very eye of faith.

As is the face, so is the mind.

The sleep of reason produces monsters.

The most potent weapon in the hands of the oppressor is the mind of the oppressed.

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

The brain is an unreliable organ, it is monstrously great, monstrously developed. Swollen, like a goiter.

From a man’s face, I can read his character. If I can see him walk, I know his thoughts.

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

“I think, therefore I am” is the statement of an intellectual who underrates toothaches.