In psychoanalysis nothing is true except the exaggerations.

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

Is there no way out of the mind?

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

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

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.

Brains are the only things worth having in this world.

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

Not all heads have a brain.

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

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.

A mind lively and at ease can do with seeing nothing, and can see nothing that does not answer.