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

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

The march of the human mind is slow.

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

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

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

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

To be too conscious is an illness—a real thoroughgoing illness.

As is the face, so is the mind.

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

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

Not all heads have a brain.

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