As he relates in his autobiography, Vico returned to Naples from Vatolla to find "the physics of Descartes at the height of its renown among the established men of letters." Developments in both metaphysics and the natural sciences abounded as the result of Cartesianism. Widely disseminated by the Port Royal Logic of Antoine Arnauld and Pierre Nicole, Descartes's method was rooted in verification: the only path to truth, and thus knowledge, was through axioms derived from observation. Descartes's insistence that the "sure and indubitable" (or, "clear and distinct") should form the basis of reasoning had an obvious impact on the prevailing views of logic and discourse. Studies in rhetoric—indeed all studies concerned with civic discourse and the realm of probable truths—met with increasing disdain.