 Unlike Saint-Cyran, Jansen, and most of the Port-royalists, Arnauld had a positive appreciation of philosophy, and a lively interest in the subject (See Nadler 1989, 18 ff.). His philosophy is typically, and correctly, classified as Cartesian. Indeed, Leibniz said, in 1691, that Arnauld had been “in all ways for Descartes for a long  time.”[3]  Arnauld enthusiastically endorsed Descartes’ physics and the approach to mind-body dualism to which it gave rise. He also adopted some parts of Descartes’ views on philosophical method.