Brain, n. An apparatus with which we think that we think.

Brains are the only things worth having in this world.

The mind of man is capable of anything.

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

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

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

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

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

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

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.

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

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

Strength of mind is exercise, not rest.