Zimmermann hypothesized that the Arabic Plotinus and Proclus would have formed parts of a large ‘metaphysics file’ (also containing works of Alexander of Aphrodisias) assembled by the Kindi circle. Our preface might actually have been appended to the file as a whole, and not just the Plotinian materials. This file would have catered to the contemporary need to see how Greek philosophy was relevant to the Islamic milieu. In particular, Plotinus and Proclus speak at length about the unity of God and the way that God relates to His creation, as well as about the human soul, its immortality and immateriality.