Thomas Aquinas accepts the Christian doctrine of the Trinity, so he believes that divinity somehow contains distinction within itself. He thinks that there are three who are God, and he also thinks that, if we ask, ‘three what?’, the answer is, ‘three persons’. However, also in line with Christian orthodoxy, Aquinas is a monotheist: he believes that there is but one, powerful, knowledgeable God. This chapter investigates why Aquinas takes the resolutely monotheistic position that he adopts everywhere, before turning in Ch. 10 to his treatment of the Trinity. The three main sections of the...

Thomas Aquinas accepts the Christian doctrine of the Trinity, so he believes that divinity somehow contains distinction within itself. He thinks that there are three who are God, and he also thinks that, if we ask, ‘three what?’, the answer is, ‘three persons’. However, also in line with Christian orthodoxy, Aquinas is a monotheist: he believes that there is but one, powerful, knowledgeable God. This chapter investigates why Aquinas takes the resolutely monotheistic position that he adopts everywhere, before turning in Ch. 10 to his treatment of the Trinity. The three main sections of the chapter are: God is one; God has power; and God's knowledge.