In the course of examining the origin of evil in the De malorum subsistentia, Proclus reproduces a position that considers the maleficent (world-)soul as cause of evil. The same entity is held to co-govern the material realm alongside the beneficent world-soul. While scholarship tends to associate the testimonium with Plutarch (and Atticus), this survey shows why Numenius of Apamea is a much more probable candidate. The discussion concludes with further proposals for a new edition of Numenius, including possible traces of Numenius in Iamblichus’ On Soul and Porphyry's On the Faculties of Soul.
