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

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

The march of the human mind is slow.

There is no female mind. The brain is not an organ of sex. As well speak of a female liver.

Brains are the only things worth having in this world.

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

Every thought is, strictly speaking, an afterthought.

As is the face, so is the mind.

What is outside my mind means nothing to it.

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.

Understanding is a very dull occupation.

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

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