Strength of mind is exercise, not rest.

What is outside my mind means nothing to it.

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

The mind of man is capable of anything.

Every thought is, strictly speaking, an afterthought.

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

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

In psychoanalysis nothing is true except the exaggerations.

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

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

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

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

The march of the human mind is slow.