Abstract

In the De malo, Thomas Aquinas claims that the first movements (primi motus) of the sensitive appetite are sinful. This seems surprising, since these movements do not appear to be under the control of reason. Unfortunately, the brevity of Aquinas’s discussion makes it difficult to understand why he would make such a claim. However, if he is read in light of the medieval debate about the first movements that was ongoing during his time, then Aquinas’s reasoning becomes much clearer. This paper thus gives an overview of the medieval debate concerning the sinfulness of the first movements in order to situate Aquinas within his historical context. It argues that Aquinas largely adopts the position of William of Auxerre, who distinguished between first first movements (motus primo primi) and second first movements (motus secundo primi). Auxerre argued that the first first movements were of animal sensuality and where therefore not sinful. The second first movements were of human sensuality and therefore, since they were in some way rational, were sinful. The paper then discusses how Aquinas makes use of this distinction and how this affects the interpretation of his position that the first movements are sinful.