"Invention is one of the great marks of genius; but if we consult experience, we shall find, that it is by being conversant with the inventions of others, that we learn to invent; as by reading the thoughts of others we learn to think."
— Reynolds, Joshua (1723-1792)
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.