Critical Genealogy, Comprehension, and Explanation in Leibniz’s Critique of Bayle on Cosmic Dualism

The main aim of this paper is to provide an account of Leibniz’s engagement with the doctrine of cosmic dualism in his Theodicy, i.e., the view that there are two distinct fundamental principles that are responsible for the existence of the created world, one good and the other evil. Leibniz’s discussion is primarily a response to arguments in favour of cosmic dualism that he finds in the writings of Pierre Bayle. However, in addition, he presents a genealogical argument that appears to be intended to provide reasons to reject the view. The paper also contains a critical discussion of Leibniz’s case, and finishes by drawing attention to some issues which arise that are worthy of further consideration.