My lovely wife picked up a cheap book for me yesterday at the library sale : The Age of Reform 1250-1550. [50 cents!]
The author, Steven Ozment, outlines Augustine’s modification of Platonism in a chart which I have reproduced here.
Augustine replaced the Platonic doctrine of reconciliation with his own distinctive doctrine of “divine illumination,” one of his most influential teachings. This doctrine placed the eternal forms of the Platonists within the mind of the triune Christian God, thereby making them truly divine ideas. Hence, when one plumbed the depths of one’s own mind in search of truth, one found there, not an innate ability to recollect eternity, as the Platonists had taught, but Christ, the eternal wisdom of God, the second person of the Trinity, whose very name was Truth. Through the illumination of Christ, indwelling truth, the mind received divine light by which it could know truly. Whether pagan or Christian, people understood and functioned within the world around them, thanks to this special grace of God. Without such divine illumination, all they would know was a chaos of phantasms. According to Augustine, just as God frees the will so that people can truly do good things, so he enlightens their minds so that they can surely know.