Abstract

Proclus' complex arguments developed in the context of his theory of evil often seem to reflect various earlier discussions of this topic. Above all, his predecessor Iamblichus seems to be a major source for his concept of evil. This becomes plausible when we attempt to outline Iamblichus' own philosophy of evil as revealed in such works as De mysteriis or De communi mathematica scientia. Particularly the latter work has not been sufficiently exploited in this respect, although the similarities with Proclus are significant. All relevant ideas with regard to Proclus' notion of papnpóstasis are prepared and prefigured in Iamblichus. This essay discusses the mode of the existence of evil, the causation of evil and its relation to being according to Iamblichus. Moreover, comparison of Iamblichus' doctrines with those of his predecessors Plotinus and Porphyry reveals the design of his concept of evil as apparently directed at Plotinus.