Note 169 — Chapter IX · CHRISTENDOM IN THE MIDDLE AGES

The indestructibility of freethought, meanwhile, was being proved even in the philosophic schools, under all their conformities to faith. Already in the ninth century we have seen Scotus Erigena putting the faith in jeopardy by his philosophic defence of it. Another thinker, Roscelin (or Roussellin: fl. 1090), is interesting as having made a critical approach to freethought in religion by way of abstract philosophy. With him definitely begins the long academic debate between the Nominalists and Realists so called. In an undefined way, it had existed as early as the ninth century,169 the ground being the Christian adoption of Plato’s doctrine of ideas—that individual objects are instances or images of an ideal universal, which is a real existence, and prior to the individual thing: “universalia ante rem.” To that proposition Aristotle had opposed the doctrine that the universal is immanent in the thing—“universalia in re”—the latter alone being matter of knowledge;170 and in the Middle Ages those who called Aristotle master carried his negation of Plato to the extent of insisting that the “universal” or “abstract,” or the “form” or “species,” is a mere subjective creation, a name, having no real existence. This, the Nominalist position—mistakenly ascribed to Aristotle171—was ultimately expressed in the formula, “universalia post rem.”