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

What is outside my mind means nothing to it.

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

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

Not all heads have a brain.

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

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

Strength of mind is exercise, not rest.

Every thought is, strictly speaking, an afterthought.

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

As is the face, so is the mind.

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

Understanding is a very dull occupation.