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

Your mind’s got to eat, too.

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

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

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

Madness need not be all breakdown. It may also be breakthrough.

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

The mind of man is capable of anything.

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.

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

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

Is there no way out of the mind?