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

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

Understanding is a very dull occupation.

What is outside my mind means nothing to it.

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

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

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

Strength of mind is exercise, not rest.

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

Brains are the only things worth having in this world.

Imagination continually outruns the creature it inhabits.

The mind of man is capable of anything.

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.