Valery on Leonardo and creativity

"A work of art should always teach us that we had not seen what we see"

"Nine times out of ten, every great improvement in a field of endeavors is obtained by the intrusion of methods and notion that were not foreseen within it. [...] All the minds that have served as substance to generations of seekers and quibblers, all those whose remains have nourished, for centuries on end, human opinion and the human mania for echoing, have been more or less universal."

Paul Valery- Introduction to the method of Leonardo da Vinci [1894]