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

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

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

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

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

The real question is not whether machines think but whether men do.

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.

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

Is there no way out of the mind?

As is the face, so is the mind.

Strength of mind is exercise, not rest.

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

What is outside my mind means nothing to it.