Date: 1751, 1777

"We may as well imagine, that minute wheels and springs, like those of a watch, give motion to a loaded wagon, as account for the origin of passion from such abstruse reflections."

— Hume, David (1711-1776)

Date: 1751

"If any Man hath found out a Kind of Motive which doth not affect himself, he hath made a deeper Investigation into the 'Springs, Weights, and Balances' of the human Heart, than I can pretend to."

— Brown, John (1715-1766)

Date: 1751

"The sympathy, therefore, or consent observed between the nerves of various parts of the body, is not to be explained mechanically, but ought to be ascribed to the energy of that sentient being, which seems in a peculiar manner to reside in the brain, and, by means of the nerves, moves, actuates,...

— Whytt, Robert (1714-1766)

Date: 1751

"The bodies of brute animals are actuated by a principle of a like kind with what is placed in man, but greatly inferior with regard to the degrees of reason and intelligence which it possesses: in the more perfect brutes, this principle is plainly intelligent as well as sentient; and their actio...

— Whytt, Robert (1714-1766)

Date: 1759

"The wheels of the watch are all admirably adjusted to the end for which it was made, the pointing of the hour. All their various motions conspire in the nicest manner to produce this effect. If they were endowed with a desire and intention to produce it, they could not do it better. Yet we never...

— Smith, Adam (1723-1790)

Date: 1759

"The first turn of mind has at least all the beauty which can belong to the most perfect machine that was ever invented for promoting the most agreeable purpose: and the second all the deformity of the most aukward and clumsy contrivance."

— Smith, Adam (1723-1790)

Date: 1759

"He might perceive a beauty of this kind in prudence, temperance and good conduct, and a deformity in the opposite behaviour: He might view his own temper and character with that sort of satisfaction with which we consider a well contrived machine, in the one case; or with that sort of distaste a...

— Smith, Adam (1723-1790)

Date: 1759

"He might view his own temper and character with that sort of satisfaction with which we consider a well-contrived machine, in the one case; or with that sort of distaste and dissatisfaction with which we regard a very awkward and clumsy contrivance, in the other."

— Smith, Adam (1723-1790)

Date: w. c. 1759-1791

"There are according to a certain medico physical society, certain natural excavations in the head of man, wherein everyone may be supposed to have a sort of twisting mill, or Gig of his own; to work and bring forward his Ideas; and whatever happens either to obstruct or impel the working of this...

— Pratt, Jermyn (d. 1791)

Date: w. c. 1759-1791

"And this in some measure accounts why there are some heads so strange and whimsical, without any fixed Ideas at all, some exceedingly heavy and confusd; some working and whirling along with amazing rapidity, depending in a great measure upon the different movements of the machine as it works and...

— Pratt, Jermyn (d. 1791)