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

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

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

Imagination continually outruns the creature it inhabits.

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

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

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

The sleep of reason produces monsters.

Every thought is, strictly speaking, an afterthought.

The mind of man is capable of anything.

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

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

What is outside my mind means nothing to it.