The march of the human mind is slow.

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

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

Every thought is, strictly speaking, an afterthought.

Brains are the only things worth having in this world.

Imagination continually outruns the creature it inhabits.

The brain is an unreliable organ, it is monstrously great, monstrously developed. Swollen, like a goiter.

Don’t lose your mind unless you have paid for it.

As is the face, so is the mind.

Understanding is a very dull occupation.

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

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

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