In his search for an ordered intelligible guide to existence, Plotinus had managed to fuse Aristotle’s regard for the material world as the work yard of form with Plato’s Demiurge as the procreative fountainhead of all truth. Yes, Plotinus says, we are born in a cave. But it’s not hard to find our way out. There’s a trail provided for us, because the links in the Chain of Being not only go down, like the steps of a ziggurat, they also lead up. The downward flow of divine perfection is matched by an equal upward striving of all things back toward their original source.