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

What is outside my mind means nothing to it.

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

Is there no way out of the mind?

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

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

The mind of man is capable of anything.

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

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

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

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.

Brains are the only things worth having in this world.

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