"But there is another kind of ALLEGORICAL fable, in which there is very little regard shewn to probability. Its object also is instruction; though it does not endeavour to instruct by real or probable actions; but wrapt in a veil of exaggerated, yet delicate and apposite fiction, is studious at once to delight the imagination, and to impress some important maxim upon the mind."
— Duff, William (1732-1815)
Text from William Duff, An Essay on Original Genius; and its Various Modes of Exertion in Philosophy and the Fine Arts, Particularly in Poetry (London: Printed for Edward and Charles Dilly, 1767). <Link to ESTC>