Your mind’s got to eat, too.

The march of the human mind is slow.

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

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

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

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

Sanity is madness put to good uses; waking life is a dream controlled.

In psychoanalysis nothing is true except the exaggerations.

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

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

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

Every thought is, strictly speaking, an afterthought.

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