Date: 1744, 1772, 1795

"Passion's fierce illapse / Rouzes the mind's whole fabric; with supplies / Of daily impulse keeps the elastic powers / Intensely poiz'd, and polishes anew / By that collision all the fine machine: / Else rust would rise, and foulness, by degrees / Incumbering, choak at last what heaven design'd ...

— Akenside, Mark (1720-1771)

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: 1789

"Hope and fear are the two grand springs by which that curious machine, the human mind, is actuated; and to deprive Virtue of that support which she receives from their influence and operation, and to substitute in their room a sense of honour, or a love of moral beauty and order, is to betray th...

— Belsham, William (1752-1827)