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Theological Glossary

What is the Trinity?

What Is the Trinity?

About the Author

Dennis Greeson is Dean of the Alexandrian Institute and executive director of the Neo-Calvinism Publication Society, as well as Fellow in Public Theology for the Land Center for Cultural Engagement.

What is the Trinity?

The word “Trinity” appears nowhere in Scripture. But the church has used the word for over seventeen centuries—and the reason it has done so tells us a great deal about how Scripture is meant to be read.

What is the Trinity?
What is the Trinity?

The Trinity is the Christian confession of God as he has revealed himself: one in essence, three in person—Father, Son, and Holy Spirit.

Of course, the word Trinity nowhere appears in Scripture. But we would have missed the boat of Scripture, so to speak, if we were to say that Scripture does not reveal God in this way.

It’s true that the Bible doesn’t present God’s self-revelation to us in a reasoned, systematic way, like a theology textbook. Instead, it tells us how God has acted in time and place, and offers us God’s own explanation of what he has done, why he has done so, and what it all means. So as soon as we pay attention to God’s words about Himself—as soon as we pay attention to Scripture as God’s self-revelation—the text itself drives us to consider what God says about Himself.

And it says that there is only one God, worthy of worship and unrivaled, with no equal. But it also confronts us with Christ, who says that when you look at Christ, when you see him, you see God himself; and that Christ is from God and does the works of God. Likewise, we see the Spirit given by the Son, who is in turn worthy of worship with the Father and the Son. The Spirit knows the mind of God. The Spirit gives life. Only God, though, gives life, and only God knows Himself.

So how do we reconcile this unity of one God with distinction? There are three persons.

The doctrine of the Trinity seeks to bring together the boundaries of what we confess, according to how God has revealed himself and what he has said. There are therefore careful grammars of God that the Church confesses through the doctrine of the Trinity. Just as grammar gives us the rules for words, our Trinitarian grammar teaches us how to speak rightly about this one God in three persons.

Just as grammar gives us the rules for words, our Trinitarian grammar teaches us how to speak rightly about this one God in three persons.

Some key parts of this doctrine are that there are no distinctions in God, for there are not three Gods, but one. So the Father, the Son, and the Holy Spirit are all and each God in His fullness.

But what is the nature of this distinction?

It cannot be that God is distinguished in three persons by the different ways that those persons work in time and place—as if what makes the Son the Son is that he is incarnate, or the Spirit the Spirit is that he indwells. This would mean that God is three by the different things that each person does. This would push us to divide the one God into three Gods.

The early Church and the Great Tradition, though, teach us to distinguish the persons by paying attention to one crucial element: the way that the Son is eternally from the Father. This is our window into a proper Trinitarian grammar. The Son does not become the Son, nor is he only the Son because He was born as a man by the Spirit. Rather, because He is eternally from the Father, He eternally is the Son.

The threeness of God is articulated by the eternal relations of Father, Son, and Spirit—not by works in time and place.

Learning the grammar of the Trinity does not just guard us from heresy. It gives us the grammar and the logic of Scripture, and teaches us to read God’s Word about Himself in a way that is faithful to God, in order that we might know him as he is.


“What Is…?” is a series from The Alexandrian Institute. New episodes every Wednesday.

Go deeper

Recommended reading on the doctrine of the Trinity:

Scott Swain, The Trinity: An Introduction

Fred Sanders, The Triune God

R. B. Jamieson and Tyler R. Wittman, Biblical Reasoning: Christological and Trinitarian Rules for Exegesis

Gregory of Nazianzus, Five Theological Orations


Image Sources: Gospel Book, Carolingian, ca. 825–50. Ink and opaque watercolor on parchment. The Metropolitan Museum of Art, New York, The Cloisters Collection and Director's Fund, 2015 (2015.560). Public domain (CC0).

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What is the Trinity?
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