Augustine, Thomas Aquinas, and Duns Scotus on the First Cause of Moral Evil

Abstract

While it is unproblematic that someone evil causes further evil, it is difficult to explain how a good person can cause his or her first evil act. Augustine, denying that something good can be the cause of evil, concludes that the first moral evil has only a ‘deficient cause’, not an efficient cause, which is to say that it has no explanation. By contrast, Aquinas and Scotus hold that the first moral evil has a cause, that the cause is something good, and that it is an efficient cause: the will. For Aquinas, the will can cause its first evil act only if it is momentarily non-culpably deficient, in that it does not make the intellect actually consider the moral rule relevant to the choice. For Scotus, no such occurrent deficiency is presupposed in the will causing its first evil act; the will’s freedom suffices. Yet there is surprising agreement: at bottom, Aquinas and Scotus both trace the first moral evil to the will’s ability for alternatives and no further. Thus their view converges with Augustine’s claim that evil ultimately has no efficient cause.