Don’t lose your mind unless you have paid for it.

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

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

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

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

“I think, therefore I am” is the statement of an intellectual who underrates toothaches.

If anything affects your eye, you hasten to have it removed; if anything affects your mind, you postpone the cure for a year.

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

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

Your mind’s got to eat, too.

What is the hardest task in the world? To think.

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

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