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

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

Though this be madness, yet there is method in’t.

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

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.

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

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

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.

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

Any man could, if he were so inclined, be the sculptor of his own brain.

The mind of man is capable of anything.

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

Imagination continually outruns the creature it inhabits.