"He will pick up from dunghills what by a nice chymistry, passing through his own mind, shall be converted into pure gold; and, under the rudeness of Gothic essays, he will find original, rational, and even sublime inventions."
— Reynolds, Joshua (1723-1792)
(p. 28, p. 237 in 1778 edition)
Text from A Discourse Delivered to the Students of the Royal Academy, on the Distribution of the Prizes, Dec. the 10th, 1774. By the President. (London: Printed for Thomas Davies, 1775). <Link to ECCO>
See also Sir Joshua Reynolds, Seven Discourses Delivered in the Royal Academy by the President (London: T. Cadell, 1778). <Link to Google Books>
Also reading at PGDP.