 Central terms in the influential Augustinian model of sins were suggestion, temptation, first movement, pleasure, and consent. Augustine thought that a first movement was accompanied by reflexive awareness as soon as one could voluntarily stop it. Without this awareness, the soul could not react to first movements with a conscious withdrawal. The Augustinian model of inner control was relatively simple and easily understood, which made it popular in medieval and early modern theology of sin. The traditional monastic exercise of repelling evil thoughts by redirecting attention was also repeated in philosophical treatises by Descartes and Leibniz. In fact, this seems to be the only device for making oneself free from occurring temptations used in Western philosophical and theological literature. (See Descartes, Les passions de l’âme, 487–488; Leibniz, Nouveaux Essais sur l’entendement humain, 187–189, 195–197.) 