if you're looking to brushen up on your Duns Scottus Eriugena

It looks as though Eriugena was ahead of his time. He's said to have ushered in not only a new way of thinking, but also a new way of building Medieval Churches, and even texts. In short, he argued that God was symbolized in light, and the light that emanated from God was bounced off the world, or universe, and reflected back to Him. After Eriugena's ideas started catching on (he was hanging out in Ireland), architects started building churches with many more windows, and texts were gilded more and more. Check this out:

Eriugena's uniqueness lies in the fact that, quite remarkably for a scholar in Western Europe in the Carolingian era, he had considerable familiarity with the Greek language, affording him access to the Greek Christian theological tradition, from the Cappadocians to Gregory of Nyssa, hitherto almost entirely unknown in the Latin West. He also produced a complete, if somewhat imperfect, Latin translation of the Corpus Dionysii, the works of the obscure, possibly Syrian, Christian Neoplatonist, Pseudo-Dionysius the Areopagite, a follower of Proclus. In addition, Eriugena translated Gregory of NyssaÂ’s De hominis opificio and Maximus Confessor's Ambigua ad Iohannem, and possibly other works, such as Epiphanius' Anchoratus.