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

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

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

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

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

Your mind’s got to eat, too.

Understanding is a very dull occupation.

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

Brain, n. An apparatus with which we think that we think.

Is there no way out of the mind?

Sooner or later if the activity of the mind is restricted anywhere, it will cease to function even where it is allowed to be free.

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

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