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)

Date: 1757

"Whatever turns the soul inward upon itself, tends to concenter forces, and to fit it for greater and stronger flights of science."

— Burke, Edmund (1729-1797)

Date: 1798

"Objects or thoughts, that have been associated with pleasure, retain the power of pleasing; as the needle touched by the loadstone acquires polarity, and retains it long after the loadstone is withdrawn."

— Edgeworth, Maria