Abstract

In the last several years, there has been an uptick of scholarly interest in Aristotelian theories of efficient causation. Much of this interest has focused on the late scholastic figure Francisco Suárez (1548-1617). This paper clarifies an important but neglected aspect of Suárez's theory of efficient causation—namely, his account of active causal powers. Like other Aristotelians, Suárez understands active causal powers as features that enable their subjects to perform certain sorts of actions. For example, a fire is able to heat in virtue of its power or capacity for heating. However, it is not immediately clear which items in an Aristotelian ontology perform the role of an active power. The paper explains and motivates Suárez's answer to this question, and shows how this answer influences his position in a scholastic controversy about the causal roles of substantial and accidental forms in substantial change.