Brains are the only things worth having in this world.

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

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.

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

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

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

The mind of man is capable of anything.

The mind is not, I know, a highway but a temple, and its doors should not be carelessly left open.

Is there no way out of the mind?

What is outside my mind means nothing to it.

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

The real question is not whether machines think but whether men do.

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