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

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

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

What is outside my mind means nothing to it.

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.

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.

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

What a torture to talk to filled heads that allow nothing from the outside to enter them.

Your mind’s got to eat, too.

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

The human mind is an evolutionary product, just like the human body.

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