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

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

Sooner or later if the activity of the mind is restricted anywhere, it will cease to function even where it is allowed to be free.

What the brain does by itself is infinitely more fascinating and complex than any response it can make to chemical stimulation.

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

We need strength, we need energy, we need quickness, and we need brain in this country to turn it around.

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

In psychoanalysis nothing is true except the exaggerations.

It is far, far better and much safer to have a firm anchor in nonsense than to put out on the troubled seas of thought.

What a torture to talk to filled heads that allow nothing from the outside to enter them.

Strength of mind is exercise, not rest.

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.