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

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

Every thought is, strictly speaking, an afterthought.

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.

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

Brains are the only things worth having in this world.

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.

The march of the human mind is slow.

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

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

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.