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

The universe is an object of thought at least as much as it is a means of satisfying needs.

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

The mind of man is capable of anything.

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

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

Understanding is a very dull occupation.

To be too conscious is an illness—a real thoroughgoing illness.

What is outside my mind means nothing to it.

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

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

As is the face, so is the mind.