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

Is there no way out of the mind?

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

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

The mind of man is capable of anything.

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

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.

Strength of mind is exercise, not rest.

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

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

What is the hardest task in the world? To think.

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

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