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

Though this be madness, yet there is method in’t.

The sleep of reason produces monsters.

“I think, therefore I am” is the statement of an intellectual who underrates toothaches.

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

my mind is
a big hunk of irrevocable nothing

As is the face, so is the mind.

Is there no way out of the mind?

Not all heads have a brain.

It is far, far better and much safer to have a firm anchor in nonsense than to put out on the troubled seas of thought.

Your mind’s got to eat, too.

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

From a man’s face, I can read his character. If I can see him walk, I know his thoughts.