The mind of man is capable of anything.

The sleep of reason produces monsters.

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

Don’t lose your mind unless you have paid for it.

Any man could, if he were so inclined, be the sculptor of his own brain.

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

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

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

What is outside my mind means nothing to it.

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

From a man’s face, I can read his character. If I can see him walk, I know his thoughts.

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 march of the human mind is slow.