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

my mind is
a big hunk of irrevocable nothing

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

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

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

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

Don’t lose your mind unless you have paid for it.

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

What is the hardest task in the world? To think.

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

The most potent weapon in the hands of the oppressor is the mind of the oppressed.

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

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