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

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

Your mind’s got to eat, too.

my mind is
a big hunk of irrevocable nothing

A mind lively and at ease can do with seeing nothing, and can see nothing that does not answer.

Strength of mind is exercise, not rest.

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

The sleep of reason produces monsters.

Understanding is a very dull occupation.

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

Is there no way out of the mind?

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

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