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On the Trinity

What does it mean that God is one being in three persons — and why does Trinitarian theology matter for prayer, salvation, and everyday Christian life?

Last updated: April 17, 2026

TL;DR

God is one being in three persons means the Father, Son, and Holy Spirit share one divine nature while maintaining distinct personal identities. Trinitarian theology matters because Christians pray to the Father through the Son by the Spirit, salvation involves all three persons, and Christian community reflects God's relational nature.

The Trinity is perhaps the most distinctive Christian conviction about God, and yet it may be the least understood or practiced in evangelical piety. Affirmed in creeds, sung in hymns, and taught in seminaries, it often remains abstract and removed from lived faith. Yet the doctrine is not a medieval luxury or obscure technical achievement; it shapes how we understand prayer (addressing Father, Son, and Spirit), salvation (the work of all three persons), worship (singing the Gloria Patri), and the very nature of love and community (since God is eternally relational within Himself).

In recent years, evangelical theology has witnessed serious debate about how to articulate Trinitarian doctrine. Are the persons 'eternally subordinate' in function? Or do they possess full equality? How do we preserve both God's absolute oneness and the genuine threeness of persons? These aren't abstract scholastic games; they affect how we preach about Christ's obedience, how we understand the Spirit's role in the church, and how we address cultural questions about gender roles. Getting the Trinity right matters because getting it wrong can distort our understanding of who God is and what He has accomplished.

Key Questions This Topic Addresses

  • How are God the Father, Son, and Holy Spirit one being yet three distinct persons?
  • Is the traditional language of 'substance' and 'persons' the best framework for expressing Trinitarian truth?
  • Are the three persons eternally equal in attributes, authority, and honor?
  • What does it mean that Jesus submitted to the Father, and does this imply eternal subordination?
  • How does the Trinity affect Christian experience: prayer, worship, community, and the image of God in humanity?

The Evangelical Debate

Three Frameworks for Understanding the Trinity

Contemporary evangelical theology has produced three major ways of framing Trinitarian doctrine, each attempting to preserve the classical conviction of one being in three persons while articulating it in ways that address modern philosophical challenges and pastoral concerns.

Position 1
Classical Trinitarianism
Sinclair Ferguson · Alister McGrath · Robert Letham · Gregg Allison
God is one divine substance (ousia) eternally subsisting in three distinct persons (hypostaseis): Father, Son, and Holy Spirit. The persons are fully equal in deity, power, and eternality, yet possess distinct subsistences and economic roles. The Son's incarnation and submission were voluntary acts in time, not expressions of eternal subordination. This framework preserves biblical language and classical Christian tradition while protecting both God's absolute unity and the real personhood and distinctness of Father, Son, and Spirit.
Key Reads
Beholding the Triune God: The Inseparable Work of Father, Son, and Spirit 5 Things You Should Know About the Doctrine of the Trinity
Position 2
Evangelical Tritheism / Soft Subordinationism
Wayne Grudem · Tom Schreiner · Randy Alcorn · Paul Helm
God eternally subsists as Father, Son, and Spirit in a relationship of voluntary, functional subordination of the Son and Spirit to the Father. The Son is eternally the Son (not begotten at the incarnation but eternally generated) and eternally submits to the Father's headship while remaining fully divine and worthy of worship. This view claims to do better justice to biblical passages about submission and subordination while maintaining the deity of all three persons, grounding it in an understanding of eternal hierarchical headship compatible with divine equality.
Key Reads
The Trinity: An Introduction The Mystery of the Trinity
Position 3
Social Trinitarianism
Miroslav Volf · Paul McPartlan · John Zizioulas · Leonardo Boff
The Trinity is best understood as three divine persons in eternal community and mutual indwelling (perichoresis), each fully divine and each freely relating to the others. God's nature is fundamentally relational and social; the Trinity provides the archetype for human community, reconciliation, and the church. This framework emphasizes the threeness over the oneness, grounds the Trinity in relationality rather than substance, and offers rich theological resources for thinking about human personhood, community, and justice as reflections of God's Trinitarian life.
Key Reads
The Exclusion and the Embrace Communion and Otherness

What the Conversation Adds Up To

The Trinitarian debate reveals how difficult it is to talk about God at the limits of language and reason. Classical trinitarianism rightly insists on God's absolute simplicity and the full equality of persons; subordinationism rightly points to biblical texts about headship and submission; social trinitarianism rightly emphasizes relationality and community as reflections of God's nature. Yet each framework struggles with tensions the others expose. The healthiest evangelical approach may be to hold classical Trinitarian affirmations (one being, three persons, full equality) while remaining humble about how to systematize the doctrine and remaining pastoral about its implications for church life and spiritual experience.

Ultimately, the Trinity is not a puzzle to solve but a mystery to worship. It tells us that God is eternally other (transcendent) and eternally relational (immanent), that oneness does not require uniformity, and that the deepest reality of God is communion. For evangelicals, the question is not whether to abandon classical Trinitarian doctrine but how to make it live in prayer, preaching, and community — how to pray to the Father through the Son by the Spirit, how to find in the Trinity the archetype of Christian unity and mission, and how to let this central mystery reshape our understanding of what it means to be made in the image of God.

The Evangelical Conversation, Curated

1
The Doctrine of the Trinity: No Christianity Without It
Kevin DeYoung · The Gospel Coalition
DeYoung boils the doctrine down to seven plain statements (one God; the Father, Son, and Spirit are each God; none is the other) and then shows where each is grounded in Scripture. Drawing on Augustine and Sinclair Ferguson, he argues that the Trinity is not a puzzle for specialists but the doctrine that makes Christianity Christian, and he presses on why it matters for ordinary believers.
2
5 Things You Should Know About the Doctrine of the Trinity
Keith Mathison · Ligonier Ministries
Mathison argues that every other doctrine, from Scripture to salvation to the church, rests on the doctrine of the triune God. He dismantles the popular myth that Nicaea invented the Trinity, showing that the council defended propositions Christians already drew from Scripture against Arius's denial of the Son's deity.
3
10 Things You Should Know about the Trinity
Fred Sanders · Crossway
Sanders insists the Trinity is revealed truth meant to be known: God is three persons in one being, a mystery that transcends reason without contradicting it. He stresses that God made himself known as triune chiefly in the sending of the Son and the Spirit, so Trinity and gospel belong together, and any account of the Trinity that has to tack salvation on afterward was probably too abstract to begin with.
4
Is the Trinity in the Old Testament?
Brandon D. Smith · The Gospel Coalition
Starting from Tertullian's reply to Marcion, Smith offers two interpretive principles for finding the triune God before the Gospels: Scripture reveals God as Father, Son, and Spirit, and Scripture is one unified revelation. Because God is eternal and unchanging, he argues, he did not become triune in the New Testament, and texts such as the name Immanuel deliberately reach back into Israel's Scriptures.
5
Working Together or One Work? Getting the Trinity Right
Matt Emerson · The Gospel Coalition
Emerson warns against a “divine multi-tool” picture in which Father, Son, and Spirit act as three separate agents cooperating on a shared project. He explains the classical doctrine of inseparable operations (every work of God is the one work of all three persons) and shows how it corrects careless ways of narrating the cross and the story of salvation.
6
Delighting in the Trinity
Michael Reeves · Ligonier Ministries
Reeves argues that only a triune God can truly win our hearts: a single-person god would have spent eternity alone and could not be love in himself. From John 17:24 and the Puritan Richard Sibbes, he portrays the Father eternally loving the Son in the Spirit, a fountain of overflowing goodness that makes God supremely desirable rather than merely demanding.
7
What the Doctrine of the Trinity Means for Our Corporate Worship
Scott R. Swain · 9Marks
Working through Revelation 4–5, Swain shows that the church's gathered worship exists because of the triune God and is directed to him. Affirming that God's outward works are undivided, he traces how Scripture appropriates distinct phases of worship to each person: the Father wills it, the Son enables it as the Lamb worthy to open the scroll, and the Spirit empowers it.
8
William Lane Craig and Evangelicalism’s Trinitarian Deficit
Phillip Cary · First Things
Taking up William Lane Craig's rejection of the Son's eternal begetting, Cary explains why the Nicene relations of origin (the Father unbegotten, the Son begotten, the Spirit proceeding) are essential to the doctrine. He argues that evangelical statements of faith that say only “three persons in one essence” leave the door open to this drift, and that the deficit shows up in preaching that forgets Jesus is God himself with us.
9
Evangelical Thinking on the Trinity Is Often Remarkably Revisionist
Michael Allen · Christianity Today
Reviewing Matthew Barrett's Simply Trinity, Allen summarizes the case that much evangelical theology has drifted into social trinitarianism, whether in Moltmann and Boff's egalitarian projects or in Grudem and Ware's appeal to the Son's eternal submission. He commends the book's recovery of classical sources while noting that it underplays the spiritual formation that framed Trinitarian reflection for Gregory of Nazianzus and Augustine.
10
Keeping the Trinity Personal
Peter J. Leithart · Christianity Today
Writing in the aftermath of the debate over the Son's eternal subordination, Leithart worries that the classical side's victory has pushed out any robust sense of the divine persons as truly personal. Reading Jesus' words to Philip in John 14 (“Anyone who has seen me has seen the Father”), he offers a biblical defense of a chastened personalism in which Father, Son, and Spirit eternally know, love, give, and receive.
11
Does Complementarianism Depend on ERAS?: A Response to Kevin Giles, “The Trinity Argument for Women’s Subordination”
Stephen J. Wellum · CBMW
Wellum explains the “Eternal Relations of Authority and Submission” (ERAS) view and why renewed study of Nicene theology has put it under serious scrutiny: distinguishing the persons by authority and obedience seems to require distinct wills in God. Writing as a complementarian who holds the classical view, he rejects Kevin Giles's claim that abandoning ERAS means abandoning complementarianism, arguing that the case for male headship stands on Scripture rather than on a Trinitarian analogy.
12
How EFS Muddles Christology and the Gospel
Samuel G. Parkison · Credo Magazine
In this excerpt from his chapter in On Classical Trinitarianism, Parkison argues that advocates of Eternal Functional Subordination have missed what the seventh-century teaching on Christ's two wills means for the Trinity. Engaging Wayne Grudem's reply to Glenn Butner, he contends that EFS creates false choices about the divine Son and the human nature, and that one need not adopt EFS to hold a biblical view of gender roles.