Understanding is a very dull occupation.

Strength of mind is exercise, not rest.

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

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

Every thought is, strictly speaking, an afterthought.

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

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

What is outside my mind means nothing to it.

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

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

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.