"These two qualities therefore, probability and plausibility, (if I may be indulged a little in the allegoric style) I shall call Sister-graces, daughters of the same father Experience, who is the progeny of Memory, the first-born and heir of Sense. These daughters Experience had by different mothers. The elder is the offspring of Reason, the younger is the child of Fancy. The elder regular her in features, and majestic both in shape and mien, is admirably fitted for commanding esteem, and even a religious veneration; the younger careless, blooming, sprightly, is entirely formed for captivating the heart, and engaging love."
— Campbell, George (1719-1796)
(I, pp. 217-20)
The Philosophy of Rhetoric. By George Campbell, 2 vols. (London: Printed for W. Strahan; and T. Cadell, 1776). <Link to ESTC>