Not all heads have a brain.

Every thought is, strictly speaking, an afterthought.

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

In psychoanalysis nothing is true except the exaggerations.

Imagination is the secret and marrow of civilization. It is the very eye of faith.

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

What is outside my mind means nothing to it.

The real question is not whether machines think but whether men do.

Understanding is a very dull occupation.

The mind of man is capable of anything.

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

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

Imagination continually outruns the creature it inhabits.