Iamblichus on the Mysteries; Psellus on Demons

is unity, permanence in themselves, an immovable cause of motions, eminent providence, and having nothing in common with those things for which they provide. And this property is preserved in them according to essence, virtue, and action. The property of souls is a declination toward multiplicity and motion, a conjunction with the gods, and the ability to receive something from others and to replenish those things through vital motion, and to conform everywhere with all things—partly remaining, yet partly flowing—and to regulate all things in themselves and through themselves. This property is preserved in them according to essence, virtue, and action. The properties of demons are to contain in themselves the gifts of the gods—in an inferior mode, indeed, than the gods, yet under their idea and reason—to contain the conditions of inferior things, while being indeed multiplied, but also mixed unitively, yet without confusion; finally, they are moved, but stably. Heroes, on the contrary, under the condition of multiplicity, motion, and commixture, possess unity, identity, status, and excellence. Demons and heroes are nearest to the extremes: the former to the gods, the latter to souls. The differences of demons to heroes [exist] principally because heroes sometimes decline more toward particular and movable things than do demons. Two intermediaries, namely demons...