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: 1724

"As a Stone in a Wall, fastened with Mortar, compressed by surrounding Stones, and involved in a Million of other Attractions, cannot fall to the Earth, nor sensibly exert its natural Gravity, no, not so much as to discover there is such a Principle in it; just so, the intelligent Soul, in this h...

— Cheyne, George (1671-1743)

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: January 1739

"An idea assented to feels different from a fictitious idea, that the fancy alone presents to us: and this different feeling I endeavour to explain by calling it a superior force, or vivacity, or solidity, or firmness, or steadiness."

— Hume, David (1711-1776)