"But notwithstanding the empire of the imagination, there is a secret tie or union among particular ideas, which causes the mind to conjoin them more frequently together, and makes the one, upon its appearance, introduce the other."
— Hume, David (1711-1776)
(cf. pp. 416-7 in Norton, p. 31-2 in 1740 ed.)
An Abstract of a Book Lately Published; Entituled, a Treatise of Human Nature, &c. Wherein the Chief Argument of That Book Is Farther Illustrated and Explained. (London: Printed for C. Borbet [sic], at Addison's Head, over-against St. Dunstan's church, in Fleet-street, 1740).<Link to ESTC>
Reading Hume's A Treatise of Human Nature ed. David Fate Norton and Mary J. Norton (Oxford and New York: Oxford University Press, 2000).