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

Understanding is a very dull occupation.

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.

The sleep of reason produces monsters.

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

Sanity is madness put to good uses; waking life is a dream controlled.

Brain, n. An apparatus with which we think that we think.

Your mind’s got to eat, too.

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

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

In psychoanalysis nothing is true except the exaggerations.