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

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

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

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

In psychoanalysis nothing is true except the exaggerations.

Strength of mind is exercise, not rest.

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

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

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

Every thought is, strictly speaking, an afterthought.

The march of the human mind is slow.

The universe is an object of thought at least as much as it is a means of satisfying needs.

Not all heads have a brain.