Not all heads have a brain.

A mind lively and at ease can do with seeing nothing, and can see nothing that does not answer.

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

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

There is no female mind. The brain is not an organ of sex. As well speak of a female liver.

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

Understanding is a very dull occupation.

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

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

The mind of man is capable of anything.

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

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

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