Brains are the only things worth having in this world.

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

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

What a torture to talk to filled heads that allow nothing from the outside to enter them.

In psychoanalysis nothing is true except the exaggerations.

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

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

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

We need strength, we need energy, we need quickness, and we need brain in this country to turn it around.

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

The sleep of reason produces monsters.

Understanding is a very dull occupation.

The march of the human mind is slow.