Ḥikmat al-Ishrāq · The Philosophy of Illumination

A metaphysics in which light is the primary reality and everything else is described by how much of it a thing has: lights of lights, managing lights, dark barriers, and a hierarchy in which each level is lit by and veils the one above it.

The nearest thing outside Judaism to the Zohar's native grammar, written four years before its author was executed and a century before the Zohar appeared. Convergence, and a startling one.