Date: 1710, 1734

"For example, the will is termed the motion of the soul: this infuses a belief, that the mind of man is as a ball in motion, impelled and determined by the objects of sense, as necessarily as that is by the stroke of a racket."

— Berkeley, George (1685-1753)

Date: 1732

"Gorgias hath gone further, demonstrating man to be a piece of clock-work or machine; and that thought or reason are the same thing as the impulse of one ball against another."

— Berkeley, George (1685-1753)