Strength of mind is exercise, not rest.

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

Brains are the only things worth having in this world.

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

The universe is an object of thought at least as much as it is a means of satisfying needs.

Every thought is, strictly speaking, an afterthought.

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

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

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

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

As is the face, so is the mind.

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

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