"Did not your master Plato maintain, that all the art of man, that all philosophy could not extract from the human mind what nature had not implanted there; as all the operations in chemistry are incapable of extracting from any mixture more gold than is already contained in it?"
— Rousseau, Jean-Jacques (1712-1778); Kenrick, William (1729/30-1779)
(III, pp. 265-6)
Text from Eloisa: Or, a Series of Original Letters Collected and Published by J.J. Rousseau. Translated from the French. 4 vols. (London: Printed for R. Griffiths and T. Becket, 1761). <Link to Vol. I><Link to Vol. II><Link to Vol. III><Link to Vol. IV>