ABSTRACT
This chapter addresses the question of how Augustine, Anselm, and Aquinas (AAA) understand the doctrine of the divine Trinity; the claim that the Christian God is three persons, yet one, unified nature. After discussing what “person” might mean, the chapter explains AAA's view that it is the relationship between the persons that distinguishes them. This explanation is developed through Augustine's analogy for the Trinity, the thinking human mind. The mind is one thing, yet thinking requires a dynamic interrelationship between memory, understanding, and will. Anselm's proof for the Trinity drawn from Augustine's analogy is then outlined. The chapter concludes with a look at Aquinas's responses to a number of problems raised with this way of thinking about the Trinity.
