Well, surely, historic criticism, criticism of style, criticism of nature, no one would go to the early or middle ages of the Church for illumination on these matters. How then should those ages develop successfully a philosophy of theology, or in other words, a criticism of physics and metaphysics, which involves the three other criticisms and more besides? Church-theology is an elaborate attempt at a philosophy of theology, at a philosophical criticism. In Greece, before Christianity appeared, there had been a favouring period for the development of such a criticism; a considerable movement of it took place, and considerable results were reached. When Christianity began, this movement was in decadence; it declined more and more till it died quite out; it revived very slowly, and as it waxed, the mediæval Church waned. The doctrine of universals is a question of philosophy discussed in Greece, and re-discussed in the middle ages. Whatever light this doctrine receives from Plato's treatment of it, or Aristotle's, in whatever state they left it, will anyone say that the Nominalists and Realists brought any more light to it, that they developed it in any way, or could develop it? For the same reason, St. Augustine's criticism of God's eternal decrees, original sin, and justification, the criticism of St. Thomas Aquinas on them, the decisions of the Church on them, are of necessity, and from the very nature of things, inadequate, because, being philosophical developments, they are made in an age when the forces for true philosophical development are waning or wanting.