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

Understanding is a very dull occupation.

Imagination continually outruns the creature it inhabits.

The march of the human mind is slow.

In psychoanalysis nothing is true except the exaggerations.

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

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

The universe is an object of thought at least as much as it is a means of satisfying needs.

my mind is
a big hunk of irrevocable nothing

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

What is outside my mind means nothing to it.

As is the face, so is the mind.

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