The mind of man is capable of anything.

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

Understanding is a very dull occupation.

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 human mind is an evolutionary product, just like the human body.

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

Imagination continually outruns the creature it inhabits.

Strength of mind is exercise, not rest.

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

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

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