Ennead I.8 was written not long before Plotinus’ death in 270 AD, at a time when he was particularly concerned with ethical issues. The treatise’ primary purpose is to argue that evil is not intrinsic to the soul, but since Plotinus always considers ethical issues within a metaphysical framework, it includes an account of the ontological status of matter. Plotinus does his best to preserve a belief in the dependence of all things on a single, supremely good First Principle while admitting that there is evil in the world. He offers a subtle account of the origin of evil in the...