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Simply Trinity: The Unmanipulated Father, Son, and Spirit Paperback – March 16, 2021

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With clarity, creativity, and conviction Barrett mines the scriptures as well as the creeds and confessions of the faith to help you rediscover the beauty and simplicity of our Triune God. Barrett introduces you to The Dream Team, the best of the church fathers, who teach us how to interpret the Bible in a way that avoids past and present trinitarian heresies. You will also be surprised to learn that what you believe about the Trinity has untold consequences for salvation and the Christian life. To truly know God, you must meet the One who is simply Trinity.
- Print length368 pages
- LanguageEnglish
- PublisherBaker Books
- Publication dateMarch 16, 2021
- Dimensions5.5 x 0.83 x 8.5 inches
- ISBN-10154090007X
- ISBN-13978-1540900074
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Editorial Reviews
Review
Fred Sanders, Torrey Honors Institute, Biola University
"Matthew Barrett wants to take you on a journey back to a time when Christians read the Bible differently than we often read it today, to a time when the orthodox doctrine of the Trinity was birthed, by means of God's sovereign Word and Spirit, in the church's theology and piety. Why is such a journey necessary? Why should you consider joining him? Dr. Barrett wants to take you back in time because he believes that the future of the church's doctrine, piety, witness, and worship is at stake. We should welcome Dr. Barrett's invitation to travel back in time so that, by the help of God's sovereign Word and Spirit, we too might join the chorus of saints in heaven and earth throughout all ages in offering the thrice-holy Trinity the worship that he alone deserves. So buckle up and enjoy your trip. Dr. Barrett is a skillful driver and a reliable guide."
Scott Swain, from the Foreword
"Matthew Barrett's book is just perfect for students of theology in the evangelical tradition. In clear and readable chapters Barrett draws his readers to appreciate classical Trinitarian theology as the foundation of biblical faith. Readers are led away from the rocks of those who have sought to convince us that such theology needs radical change, into the calm and wide sea that is the Christian community's historic faith."
Lewis Ayres, Durham University
"Matthew Barrett exposes those tinkering with the Trinity and has a great antidote to it. He offers a sane and sober recovery of the church's exegesis of Scripture to explain that the three persons of the Godhead share in one substance, power, and eternity without hierarchies or other heresies. Barrett provides an informative mix of exegesis, church history, and systematic theology to defend the Christian doctrine of the Trinity against its unwitting saboteurs."
Michael F. Bird, Ridley College in Melbourne, Australia
"Simply Trinity delivers an accessible scholarly introduction to historic and biblical understandings of the Trinity, and demonstrates how much is at stake in the trinitarian debates that have recently roiled the evangelical community. I recommend it highly."
Thomas S. Kidd, Baylor University
"I was blown away by this book, a clear, powerful intervention into trinitarian controversy. The critique of evangelical subordinationists alone is fantastic and no attentive reader should miss the connections with social trinitarianism. Evangelical theology is in serious trouble and I think many of us have known that for years, but this book will be impossible to ignore. We simply must turn this trend around, or else evangelicalism will lose its hold on the gospel."
Craig Carter, Tyndale University
"I hope this accessible book is widely read and discussed, especially by evangelicals. It will challenge some things taught in recent decades. But Barrett's arguments from scripture and tradition are to be taken seriously since we all long for our speech and worship of the Triune God to be faithful."
Kelly M. Kapic, Covenant College
"Barrett glorifies the infinitely simple Father, Son, and Holy Spirit with deep wisdom. This would be reason enough to read, but most doctrinally rich books about the Trinity are boring. By contrast, this book sings! From the get-go, Barrett captures one's attention and doesn't let go. The result is urgently needed nourishment for both head and heart."
Matthew Levering, Mundelein Seminary
"Matthew Barrett provides the church with a valuable resource, introducing a pro-Nicene account of the Trinity peppered with stories, illustrations, and examples that will make Simply Trinity both engaging and understandable for students and for Christians in the pew. This work is solidly biblical, consciously pro-Nicene, and the ideal replacement for the various social trinitarian treatments of the Trinity that have been popular in the local church in recent decades."
Glenn Butner, Sterling College
"Immediately convinced of the necessity this book, readers become acquainted with the history of Trinity drift as well as the history of its antidote. Barrett's style is both inviting and accessible, utilizing first person narrative and cogent theological explanation, to communicate rigor and depth. He presents a biblically and historically thorough case for the simple Triune God differentiated only by eternal generations and spiration. I will value this book as a scholarly dialogue partner and pedagogical teaching text, showing that if we fail to submit ourselves to the image of our gracious God consistent in text and tradition we will have no foundation from which to think and live theologically in such a demanding time as this."
Amy Peeler, Wheaton College
"The Trinity is the foundational mystery of the Christian faith. From within the life and love of the Father, the Son, and the Holy Spirit all the other great mysteries of the faith flow - Creation, the Incarnation, Salvation, Pentecost, and the church and the sacraments. The Bible is the history of the Trinity acting within our time-bound world so as to take us into its eternal life of love. Matthew Barrett is a theologian who marvels in the Trinity, a man who perceives the Trinity's importance. Because of his love of the Trinity, Barrett is flustered by the fact that many twentieth-century evangelical theologians have used and distorted the Trinity for their own social and political agendas. They have misinterpreted the scriptures. They are ignorant of the Fathers of the Church, and much of the Christian theological tradition, both Catholic and Protestant. They have, Barrett sates, set the Trinity adrift. Barrett's book is a refutation of such Trinitarian drift, but more so, it is a clear, creative, robust, and scholarly presentation of the Trinity, a presentation that will bring joy to the minds and love to the hearts of all who read it. In so doing, all will give praise the Father, honor to the Son, and glory to the Holy Spirit." -Thomas G. Weinandy, Capuchin College, Washington, DC
"The Trinity is one of the Bible's more challenging doctrines and yet Matthew Barrett ably guides readers through the issues to present clear and cogent teaching. He opens the treasures of the past and draws upon patristic, medieval, Reformation, and contemporary theologians to explain the doctrine of the Trinity. But he also usefully shows where some have gone astray and charitably speaks the truth in love. People do well to read this book to plumb the depths of the Bible's teaching on the nature of our triune God."
J. V. Fesko, Reformed Theological Seminary
Jackson, Mississippi
"Simply Trinity could be a game changer. By writing a book for laypersons on the doctrine of the Trinity and the contributions of the church fathers Matthew Barrett may have gone a long way in helping to banish popular errors that continue to persist about the very nature of God. But this book is so much more. Complex doctrines and historical terms are brought out of the halls of academia and given back to the laity. As I read, there were moments when I shut my eyes and gave thanks to the God whose essence and perfections are beyond words. Please read this book."
Todd Pruitt, Covenant Presbyterian Church in Harrisonburg; Mortification of Spin
"Matthew Barrett has written a stormer of a book. He meets head-on the major turn away from the historic Christian account of the triune God to the post-enlightenment account that favored redefinition and novelty tending towards unorthodoxy. In the 20th century evangelicals adopted this new strategy and have sought to redefine God in favor of their social agendas. I am grateful to God for this book and for the service professor Barrett has done the church of Christ."
Liam Goligher, Tenth Presbyterian Church
"Simply Trinity covers a lot of ground. Matthew Barrett introduces the mystery of the Trinity by helping his readers interact with a large swath of scriptural truths in conversation with historic Christian orthodoxy. While doing so, he also helps readers compare his findings of the older manner in which the Christian theological tradition expressed itself on the Trinity with contemporary versions of the Trinity. Several contemporary versions are found wanting for various reasons. This book will help nudge its readers in a more scriptural and historically orthodox formulation of the doctrine of the Trinity; it will also help in doing the same for various attributes of God. If you are interested in what Scripture teaches about God and Trinity, and how the early creeds of Christianity formulated Scripture's teaching into creedal statements (and how many in our day have left the old paths on this issue), this book is for you."
Richard C . Barcellos, Grace Reformed Baptist Church, Palmdale, CA; IRBS Theological Seminary, Mansfield, TX
"Christian belief in the Trinity is not an abstract theological idea but a practical explanation of a lived experience of God. By telling his own story, Matthew Barrett reminds us of this truth and takes us into the heart of our faith."
Gerald Bray, Beeson Divinity School
From the Back Cover
To truly know God, we must understand God as Trinity. But what if the Trinity we've been taught is not the Trinity of the Bible?
In this groundbreaking book, Matthew Barrett reveals a shocking discovery: we have manipulated the Trinity, re-creating the Father, Son, and Holy Spirit in our own image. With clarity and creativity, Barrett mines the Scriptures as well as the creeds and confessions of the faith to help us rediscover the beauty, simplicity, and majesty of our triune God. What we believe about the Trinity also has untold consequences for salvation and the Christian life.
"Matthew Barrett has the evangelical instinct for classic, time-tested, deeply traditional biblical teaching about the Trinity. . . . Simply Trinity proclaims the good news of the unmanipulated doctrine of the triune God."--Fred Sanders, Torrey Honors Institute, Biola University
"Readers are led away from the rocks of those who have sought to convince us that biblical, classic trinitarian theology needs radical change, and into the calm, wide sea that is the Christian community's historic faith."--Lewis Ayres, Durham University
"Matthew Barrett offers a sane and sober recovery of the church's exegesis of Scripture and defends the Christian doctrine of the Trinity against its unwitting saboteurs."--Michael F. Bird, Ridley College
Matthew Barrett is associate professor of Christian theology at Midwestern Baptist Theological Seminary. He is the author of None Greater; Canon, Covenant, and Christology;and God's Word Alone. He is also the executive editor of Credo magazine and the host of the Credo podcast.
About the Author
Product details
- Publisher : Baker Books (March 16, 2021)
- Language : English
- Paperback : 368 pages
- ISBN-10 : 154090007X
- ISBN-13 : 978-1540900074
- Item Weight : 2.31 pounds
- Dimensions : 5.5 x 0.83 x 8.5 inches
- Best Sellers Rank: #65,594 in Books (See Top 100 in Books)
- #52 in Christian Systematic Theology (Books)
- #5,398 in Christian Living (Books)
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About the author

Matthew Barrett is Associate Professor of Christian Theology at Midwestern Baptist Theological Seminary, as well as the founder of Credo Magazine (credomag.com) and host of the Credo Podcast (credomag.com/podcast). He is also the Director of the Center for Classical Theology. He is the author of several books, including Simply Trinity: The Unmanipulated Father, Son, and Spirit, which won the Christianity Today Book of the Year award in Theology and Ethics. He is currently writing a Systematic Theology for Baker Academic.
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by Matthew Barrett (Grand Rapids: Baker Books, 2021) 364 pp, paper, $17.82
Simply Trinity is the best book I have read in support of Classical Theism, what Matthew Barrett (Associate Professor of Christian Theology at Midwestern Baptist Theological Seminary) terms “The Great Tradition,” and the rule of faith (p. 35). The Great Tradition is grounded in the Nicene Creed (p. 37) and reinforced by the pro-Nicene Church fathers. Barrett turns to what he calls his “dream team” of pro-Nicene advocates as those who were the most influential in supporting and passing down the Great Tradition. The team consists of 12 theologians including: Athanasius, Augustine, Aquinas, John Owen, John Gill and the Cappadocian Fathers: Basil and the Gregorys. Barrett quotes from his dream team time and again to demonstrate that Classical Theism has deep roots and is biblical.
The motivation undergirding Simply Trinity is Barrett’s belief that the Trinity has been manipulated and distorted beyond recognition, not only by liberals, but by evangelicals as well (pp. 14, 30-32, 73). He warns of Trinity drift (p. 21), led primarily by those who have moved from Classical Theism to social trinitarianism, (pp. 28-30 and chapter three). In social trinitarianism God is a community (pp.78-80), with each person of the Godhead having a separate will (pp. 148-149). Social trinitarianists twist the Trinity into conformity to their unique views on politics, unity, ecology, egalitarianism, patriarchy or sex (pp. 28-30). In doing so the Trinity is misunderstood, and misapplied, to support whatever position or cause one wants to emphasize. The evangelical form of social trinitarianism is found most predominately in the view known as eternal functional subordination (EFS) (p. 91), promoted by theologians such as Wayne Grudem and Bruce Ware. Their position comes under extensive fire throughout, but especially in chapter eight (pp. 213-259).
Barrett believes the Nicene Fathers got the Trinity right when they taught that the Father is the source of origin (paternity), the Son is eternally begotten (filiation), and the Spirit eternally proceeds from the Father and Son (spiration), (pp. 24-25). These are the only distinguishing marks within the Godhead (pp. 60, 106). “The Father is the principle in the Godhead… Unbegotten” (p. 171), but this does not imply a hierarchy or priority of the Father in relation to the Son and the Spirit (p. 172). While this may be the orthodox understanding of the Trinity, it leaves much to be explored, and Barrett does his best to explain important terms and concepts such as:
• Begotten means to come forth or proceed. The Son is eternally begotten, or eternally generated. “Generation alone is what distinguishes the Son as Son” (p. 162). The Son is not generated in time, but from the Father from all eternity (p. 165). Barrett is convinced that if the Son is not eternally begotten, we have no confidence that we can be born again (p. 180).
• Simplicity “means God is not made up of, composed of, or compounded by parts” (p. 54). “Simplicity is true of each person in the Trinity, since each person is a subsistence of the divine essence” (p. 55).
• Inseparable operations explains that the Persons of the Trinity work inseparably in all things including creation and salvation (p. 57). “Every act of God is the single act of the triune God” (p. 227). Barrett phrases it this way: “Every operation is from the Father, through the Son, in the Spirit” (p. 293), and “What the Father planned and the Son accomplished, the Spirit applied” (p. 290).
• Divine appropriations further flushes out inseparable operations for, while the external works of the Trinity are indivisible, yet a “particular work may be appropriated by a person of the Trinity in a way that corresponds to that person’s eternal relation of origin” (p. 288). With divine appropriations, the Father begins, the Son executes, and the Spirit perfects (p. 300).
• There is a difference between the immanent and the economic Trinity. “The immanent Trinity refers to who our triune God is in eternity, apart from the created order” (i.e. the ontological Trinity) (p. 112). “The economic Trinity, however, refers to how this triune God acts toward the created order (i.e. God’s external operations). The economic Trinity reveals God in external operations (p. 112); it reveals something true about the Trinity’s eternal, immanent identity, but God’s identity is not dependent on His actions in history (p. 116).
• Impassibility “means God is not subject to emotional fluctuation” (p. 173).
• Spiration simply means that the Spirit eternally proceeds from the Father and Son (p. 267).
Barrett tackles the difficult questions and texts. He traces Old Testament evidence of the Trinity (p. 109), examines passages such as Psalm 2:7 and Acts 13:33 (pp. 195-198), 1 Corinthians 15:28 (pp. 218, 238, 242-246), 1 Corinthians 11:3 (pp. 222, 251-253), and Philippians 2:4-6 (pp. 246-248). Important questions related to the incarnation (pp. 294-297) and events at Pentecost are also addressed. I was unconvinced by the author’s use of the metaphors of wisdom (pp. 201-202) and the Ancient of Days (pp. 207-209) to explain the generation of the Son. And his attempt to introduce the Covenant of Redemption as an agreement within the Trinity was questionable. If there are not separate wills within the Trinity then in what sense is an “agreement” necessary or even possible? This is standard Reformed Theology but seems to me to undermine Barrett’s thesis. But Simply Trinity would be hard to beat for a valuable defense of Classic Theism.
Reviewed by Gary E. Gilley, Pastor-teacher at Southern View Chapel
As far as the positives go, Barrett is clearly an accomplished expert on the church fathers, both pre- and post- Nicene. His arguments are firmly grounded in logic, philosophy, and the historical development of the theology of the Trinity. The vast bulk of his assertions come from these quarters, less so from Scripture (though he handles the Scripture well). Unfortunately, Barrett dismisses opposing arguments that rise from Scripture by perjoratively labeling his opponents as “biblicist,” as though they were unaware of the context and larger narrative of Scripture.
Barrett’s main argument is that the only distinctions between the persons within the ontological Trinity (ad intra) are “eternal relations of origin:” the Father is unbegotten, the Father eternally begets (generates) the Son (meaning the Father eternally communicates to the Son His own essence and nature), and the Father and the Son spirate, or send forth, the Holy Spirit. Barrett admits to additional distinctions in the outward operations (ad extra) of the economic Trinity.
In chapter three, Barrett does a good job in tracing modern liberalism’s illegitimate reconstruction of the Trinity to fit their own agenda for society. But in my opinion, he wrongly accuses conservative, biblical theologians of doing the same thing: starting with their desired construct of social relations and then imposing that construct on the Trinity. This seems to me to be a grossly uncharitable charge: is it not possible that those theologians derive their view of the Trinity (even though incorrect) from their honest understanding of Scripture and then see analogs in human relationships? Barrett gets in the way of his own message repeatedly with accusations like this. Another example is found on page 36 where he throws out the accusation that sola scriptura has been interpreted as “me and my Bible alone.” This is unfortunate: Barrett’s debate is with theologians, not the average believer in the pew. Does he really think any credible theologian would hold such a silly view?
Occasionally Barrett appears to overstate his point. On page 104 we find this statement: “For the first-century believer, to become a Christian was to embrace the salvation given and accomplished by none other than the triune God: Father, Son, and Holy Spirit…. For these early Christians, to believe the gospel was to believe that the one God of Israel was triune. Anything less was simply not Christian. A gospel that was not trinitarian was no gospel at all.”
Well, yes. And, no. While belief that Jesus is the divine Son of God was (and is) crucial to salvation, there was still much confusion, even among believers, as to exactly how that truth was to be reconciled with the historic monotheism of the Jews. Barrett’s confident assertion flies in the face of 400 years of church history, in which godly men were seeking to untangle the mystery of the Trinity. Barrett seems to claim that the first century Christians had it all figured out. But does not the early history of the church record their debates, disagreements, and difficulty in fitting the pieces together?
On the other hand, there are places in which Barrett is able to condense his argument to a single, brilliant statement, and this constitutes a large part of the value of his book. For example, on page 123 Barrett states: “[Christ’s] eternal relation to the Father constitutes his redemptive mission to the world, but not vice versa. Get that order right, and we see the gospel in proper trinitarian perspective; get that order wrong, and we misuse the gospel to redefine the Trinity in eternity.”
In my view, Barrett makes his strongest argument against EFS on pages 138-9. He builds a case that to be one in essence but manifested in three persons, means of necessity that there cannot be three different wills. Because the three (persons) are one in essence, there can only be one unified (simple) will. The one shared will of the Trinity rises out of the one shared divine nature of the Trinity. The problem with EFS is this: if Christ is eternally submitted to the Father’s will (rather than sharing the one and same will), it implies that there are two different wills—the Father’s, and Christ’s—which would then argue for two different natures. This creates an untenable division in the ontological Trinity; such a thing cannot be.
Barrett makes another powerful argument on page 239:
"But EFS is asking the wrong question. The right question is this: is submission ad intra or ad extra; is it intrinsic to the immanent Trinity, or is it something that occurs in the economy (in the context of salvation history)? Biblical Christian orthodoxy has always acknowledged that the economy of salvation involves the incarnate Son submitting to the mission his Father has given to him for the purpose of salvation."
Barrett goes on to flesh out the thought. I think this is the point in which I finally allowed Barrett to sharpen my understanding, by understanding the Son’s submission to the Father to be connected to his redemptive mission but not to his eternal relation to the Father. Barrett deals with 1 Corinthians 15:24-28 on page 243, stating that it applies not to the Son in the form of God, but to the Son in the form of a servant: “The context is not the immanent Trinity but the economy, the redemptive mission of the incarnate Son.”
Like Barrett’s book, this review has already gone on too long. In conclusion I believe Barrett makes his principal point, demolishing EFS and asserting that the distinctions in the immanent Trinity have to do with eternal relations of origin. It is unfortunate that Barrett occasionally gets in his own way by unnecessary and uncharitable characterizations of people on the other side of the fence. For his excellent command of the early church fathers, Barrett gets five stars. For his at-times-uncharitable tone and the excessive length of the book and the sense of repetition, three stars. For the fact that he did ultimately convince me that my former position (EFS) on the Trinity was wrong, we’ll settle with four stars. Recommended.
If you don’t have the time to read Barrett’s book, read Mike Riccardi’s excellent five-page blog post entitled, “EFS Redux: Aiming for Closure on the Trinity Debate.” Google it. Riccardi gets right to the point (in five short pages), and his logic is unassailable.
Quote by Dick Winn.
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