His works show ideas drawn from many sources: from the Kabbalah, Paracelsian alchemy, medieval mysticism, the medieval 'heretics' of the Reformation, Spanish sixteenth-century Quietism, Lutheran mysticism and Pansophism.
To this period dates his most famous Inquisition case, the one against François Fénelon, whose work Explication des Maximes des Saints had been accused of being sympathetic to Quietism.
Christian Renoux, 'Quietism', in The Papacy: An Encyclopedia, vol 3, edited by Philippe Levillain, 3 vols, (London: Routledge, 2002)