Topic

God and Trinity

Who God is: one God in three persons, Father, Son and Holy Spirit, sharing one divine nature while remaining distinct from each other.

History

Roots

Christianity began inside Jewish monotheism. Its first confession was Israel’s: “Hear, O Israel: The LORD our God, the LORD is one” (Deuteronomy 6:4). Yet the earliest Christians also worshipped Jesus, called him Lord, and baptized “in the name of the Father and of the Son and of the Holy Spirit” (Matthew 28:19). The New Testament places the three side by side in blessings and greetings (2 Corinthians 13:14) and says the Word who was with God also was God (John 1:1). It does not explain how these fit together. The doctrine of the Trinity is the church’s long answer to that question.

The Early Church tried several answers before settling on one. Modalism, associated with Praxeas and later Sabellius, said Father, Son and Spirit are one person appearing in three roles. Tertullian answered it in Against Praxeas (c. 213, New Advent), one of the earliest Latin works to use the word trinitas and the formula of one substance in three persons. Other writers, especially in the Greek East, protected the distinction of the persons by ranking the Son and Spirit below the Father. That habit set up the crisis of the 300s.

Causes

Around 318 Arius, a priest in Alexandria, taught that the Son was the first and greatest creature: divine in rank but made by the Father out of nothing, so that “there was when he was not.” His bishop, Alexander, condemned him, and the quarrel spread across the empire. The emperor Constantine called the Council of Nicaea (325), which declared the Son “begotten, not made, of one substance (homoousios) with the Father” and anathematized Arius’s slogans (creed and canons, New Advent).

Nicaea did not end the fight. Homoousios was not a biblical word, and many bishops feared it blurred Father and Son together. For fifty years councils issued rival creeds, and emperors exiled whichever side they disliked. Athanasius, Alexander’s successor, was exiled five times defending Nicaea. His Discourses Against the Arians (New Advent) argued that only one who is truly God can save, because salvation means being joined to God.

The second question was the Holy Spirit. A party later called the Pneumatomachians (“Spirit-fighters”) accepted the Son’s divinity but denied the Spirit’s. Basil of Caesarea answered in On the Holy Spirit (c. 375, New Advent), Gregory of Nyssa in On the Holy Spirit, Against the Macedonians (New Advent), and Gregory of Nazianzus in his Fifth Theological Oration (380, New Advent), which argued that revelation came in stages: the Old Testament showed the Father clearly, the New showed the Son, and the church now confessed the Spirit. The Council of Constantinople (381) adopted their position, confessing the Spirit as “the Lord and Giver of life, who proceeds from the Father, who with the Father and the Son together is worshipped and glorified” (New Advent). The creed as finalized there is the Nicene Creed most churches still say.

Influence

The settlement of 381 became the shared confession of almost every Christian body, East and West, Catholic, Orthodox and Protestant. It also shaped what came next. Once the Son was confessed as fully God, the church had to ask how God could also be fully human, which led to the councils on Christ, from the Council of Ephesus to the Council of Chalcedon.

In the West, Augustine’s On the Trinity (c. 400–420, New Advent) became the standard account. The Athanasian Creed (Latin, probably fifth or sixth century, not by Athanasius; Catholic Encyclopedia, secondary) summed up that tradition in its rule: “we worship one God in Trinity, and Trinity in Unity; neither confounding the persons, nor dividing the substance.” Western churches added the Filioque to the creed, starting in Spain in 589 and reaching Rome in the eleventh century, and the East’s objection to it fed into the Great Schism of 1054.

Medieval theology built on Augustine. Thomas Aquinas gave the doctrine its most systematic Western form in the Summa Theologiae (I, qq. 27–43), joined to a doctrine of God’s simplicity (I, q. 3) that later writers call Classical Theism. In the East, Gregory Palamas (fourteenth century) distinguished God’s unknowable essence from his uncreated energies, which humans can share in; Orthodox councils in 1341 and 1351 endorsed his view, and it underlies the Orthodox teaching on Theosis.

The Reformation kept the creeds. The Westminster Confession states that “in the unity of the Godhead there be three persons, of one substance, power, and eternity” (ch. 2.3). But the Reformation’s appeal to Scripture alone also encouraged some to reject the doctrine as unbiblical. Michael Servetus was burned in Geneva in 1553, with John Calvin’s support, for denying it. The Polish Brethren set out an anti-Trinitarian faith in the Racovian Catechism (1605; 1818 English translation, Archive.org), a forerunner of later Unitarianism.

In the modern period the doctrine first faded and then revived. Friedrich Schleiermacher placed it at the very end of The Christian Faith (1821–22), as a summary rather than a foundation. Karl Barth reversed that, opening his Church Dogmatics (I/1, 1932) with the Trinity as the shape of revelation itself. Karl Rahner’s The Trinity (1967) argued that the God revealed in salvation history is God as he really is, and set off decades of fresh work in every tradition.

Key ideas and contributors

One God. The doctrine is first a confession of monotheism. Christians do not worship three gods. The Father, Son and Spirit share one divine nature, one will and one action toward the world. The Catechism of the Catholic Church puts it plainly: Christians are baptized “in the name,” not “in the names,” of the three (CCC 232–233, Vatican).

Three persons, really distinct. Against modalism, the three are not masks or phases. The Son prays to the Father; the Father sends the Spirit in the Son’s name (John 14:26). The Cappadocians, Basil and the two Gregorys, fixed the vocabulary: one ousia (being) and three hypostaseis (persons), with Basil’s letters and On the Holy Spirit doing much of the work of separating the two terms.

Distinguished only by relations. What makes the Father the Father is that he begets; the Son is begotten; the Spirit proceeds. Nothing else distinguishes them: each is wholly God, equal in glory, power and eternity. Gregory of Nazianzus framed it this way in his theological orations, and Aquinas formalized it as “subsistent relations” (ST I, q. 29, a. 4).

Eternal generation. The Son is begotten “before all ages.” Athanasius argued that because the Father was always Father, the Son always existed; generation is an eternal relation, not an event in time (Discourse I, New Advent).

Inseparable operations. Since the three share one nature, they act together in everything God does outside himself, though each act may be “appropriated” to one person: creation to the Father, redemption to the Son, sanctification to the Spirit. This principle runs through Augustine’s On the Trinity and the whole Western tradition after him.

Analogies, and their limits. Augustine searched the human mind for an image of the Trinity and offered memory, understanding and will as one mind with three acts (On the Trinity X). He insisted the image falls short. Eastern writers preferred to begin from the three persons and the Father as their source, a difference of emphasis that later shaped the Filioque debate.

Economic and immanent Trinity. Rahner’s rule, that “the ’economic’ Trinity is the ‘immanent’ Trinity and vice versa,” holds that the way God acts in history (the economy) truly reveals who God is in himself. Jürgen Moltmann (The Trinity and the Kingdom, 1980) and the Orthodox theologian John Zizioulas (Being as Communion, St Vladimir’s Seminary Press, 1985) pushed this toward a “social” model in which the persons’ communion is the heart of God’s being, and offered it as a pattern for human community.

Key controversies

Arianism and its heirs. The founding dispute was whether the Son is Creator or creature. Arius leaned on texts that seem to rank the Son below the Father: “The Father is greater than I” (John 14:28) and Wisdom’s words “the LORD created me at the beginning of his work” (Proverbs 8:22). Athanasius read the first as speaking of the incarnate Son and the second as not about the Son’s origin at all. The Arianism note covers the dispute itself; later groups such as Jehovah’s Witnesses hold a similar view of the Son.

The procession of the Spirit. The longest-running division inside Trinitarian Christianity. The West confesses the Spirit proceeds from the Father “and the Son,” the Filioque, following Augustine and Aquinas (ST I, q. 36). The East, with Photius in the ninth century, holds to Procession from the Father Alone, and objects both to the theology and to the West changing an ecumenical creed without a council. The Council of Florence (1439) reached a short-lived union on the point (decree Laetentur Caeli, EWTN), which the Orthodox faithful rejected.

Essence and energies. Western critics, following Aquinas’s teaching on simplicity, have charged Palamas with dividing God into parts. Orthodox theologians answer that without the distinction either God is unknowable altogether or creatures become God by nature. The dispute ties the doctrine of God to the doctrine of salvation, since Orthodox Theosis depends on it.

Unitarian and Oneness rejections. The Socinians and later Unitarians argued from Scripture that the doctrine is a later Greek overlay on a simpler biblical monotheism. In the twentieth century a modalist position returned within the Pentecostal movement. Starting at a 1913 camp meeting at Arroyo Seco, California, some preachers began baptizing “in Jesus’ name” only and teaching that Father, Son and Spirit are titles of one person, Jesus. The Assemblies of God adopted a firmly Trinitarian Statement of Fundamental Truths in 1916, and the Oneness ministers left to form their own churches (Christian History, “Dividing Over Oneness”, secondary).

Social Trinitarianism. Critics, many of them defenders of Classical Theism, argue that social models describe three centers of will and consciousness and drift toward tritheism. They also argue that reading the Trinity as a template for human politics or church order projects human ideals back onto God. Defenders reply that the classical model risks collapsing the persons into one mind with three labels.

The Son’s eternal submission. In June 2016 a sharp dispute broke out among conservative evangelicals. Liam Goligher and Carl Trueman charged that Wayne Grudem and Bruce Ware, by teaching the Son’s eternal functional subordination to the Father, had departed from Nicene orthodoxy, and that they used it to ground male headship in Complementarianism (reformation21 roundup, secondary). Grudem and Ware answered that they affirmed full equality of nature and pointed to the Son’s submission in texts such as 1 Corinthians 15:28. Critics, including patristics scholars, replied that one will in God cannot be divided into authority and obedience. Egalitarian writers such as Kevin Giles had made the same charge for years, which is why the debate also touches Egalitarianism.

Classical theism and its revisers. A related argument is over God’s attributes rather than the persons. Classical theism, from Augustine to Aquinas to the Reformed confessions, holds God to be simple, unchanging and impassible (Malachi 3:6). Open Theism, set out by Clark Pinnock and others in The Openness of God (1994), argues that God genuinely responds to creatures and does not know the free future exhaustively. That feeds the debate over Divine Foreknowledge. Classical theists answer that a God who changes or learns would not be the God of the creeds.

What remains unresolved

The core of the doctrine is not in serious dispute among the major churches: Catholic, Orthodox, Oriental Orthodox and Protestant all confess the creed of 381. What remains open is how to read it. The Filioque still divides East and West, though many scholars now treat it as a difference of emphasis more than of faith. Within Western theology, the live question is whether the Trinity should be described mainly in terms of one God’s inner life or in terms of three persons in communion, and how much of God’s way with the world can be read back into God himself. The 2016 debate showed that this is not only an academic question: it reaches into how churches order ministry and family.