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

Is there no way out of the mind?

Understanding is a very dull occupation.

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

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

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

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

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.

What the brain does by itself is infinitely more fascinating and complex than any response it can make to chemical stimulation.

There is no female mind. The brain is not an organ of sex. As well speak of a female liver.

The march of the human mind is slow.

The sleep of reason produces monsters.

The mind of man is capable of anything.