Isn't the Trinity a logical contradiction?
Christians say there is one God, yet the Father is God, the Son is God and the Spirit is God. That makes three gods, or else it means 1 + 1 + 1 = 1. A doctrine that breaks basic arithmetic cannot be true, however many councils endorse it.
A contradiction says something is both one and three in the same sense at the same time. The Trinity does not. It says God is one in being (one 'what') and three in person (three 'whos'). That is a mystery that stretches our minds, but it is not nonsense. And it is not a philosopher's invention: it is what you get when you take seriously both the Bible's insistence that there is only one God and its treatment of the Son and the Spirit as truly divine.
What Scripture says
4Hear, O Israel: The LORD our God, the LORD is One.
The Shema: Israel's foundational confession that the LORD is one. The Trinity affirms this, not denies it.
5I am the LORD, and there is no other; there is no God but Me. I will equip you for battle, though you have not known Me, 6so that all may know, from where the sun rises to where it sets, that there is none but Me; I am the LORD, and there is no other.
There is no God besides the LORD. Biblical monotheism rules out a family of three gods.
6yet for us there is but one God, the Father, from whom all things came and for whom we exist. And there is but one Lord, Jesus Christ, through whom all things came and through whom we exist.
Paul splits the Shema's 'God' and 'Lord' between the Father and Jesus Christ while still confessing one God.
19Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,
Baptism into one 'name' (singular) that belongs to Father, Son and Holy Spirit together.
1In the beginning was the Word, and the Word was with God, and the Word was God. 2He was with God in the beginning. 3Through Him all things were made, and without Him nothing was made that has been made.
The Word is both 'with God' (distinct) and 'was God' (sharing the divine nature), and is the agent of all creation.
14The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with all of you.
An early benediction naming the three together as the one source of grace, love and fellowship.
24For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh.
Two persons become 'one flesh'. The Hebrew word for 'one' (echad) can describe a unity made of more than one.
The case
What a contradiction actually is
The law of non-contradiction, as Aristotle stated it, says a thing cannot both be and not be something in the same respect at the same time. "God is one God and three Gods" would violate it. "God is one person and three persons" would too. The Trinity says neither.
The historic formula, shared by Catholic, Orthodox and Protestant Christians, is:
- One in being (Greek ousia, Latin substantia): there is exactly one divine nature, one God.
- Three in person (Greek hypostasis, Latin persona): the Father, the Son and the Holy Spirit are each a distinct "who", able to love, speak to and glorify one another.
"One what, three whos" is a short way to put it. The oneness and the threeness answer different questions, so there is no arithmetic contradiction. The "1 + 1 + 1 = 3" objection assumes that each person is a separate portion or copy of deity that must be added up. Christian theology denies that. Each person is fully God, not one-third of God, because each fully shares the one undivided divine being.
Why Christians hold such a strange doctrine
Nobody would invent the Trinity to make religion easier. It arose because the early Christians, almost all of them Jews, were trying to be faithful to three things Scripture said at once.
1. There is only one God
Israel's confession is uncompromising (Deuteronomy 6:4; Isaiah 44:6; 45:5). The first Christians never abandoned it. Paul still calls idols "nothing" and insists there is "one God" (1 Corinthians 8:4-6).
2. The Father, Son and Spirit are each truly divine
- The Father is God (John 6:27; Galatians 1:1).
- The Son is the Word who "was God" (John 1:1), whom Thomas confesses as "my Lord and my God" (John 20:28), through whom all things were made (John 1:3; Colossians 1:16).
- The Spirit is the one Ananias lied to when he lied to God (Acts 5:3-4), who searches "the depths of God" (1 Corinthians 2:10-11).
3. The three are genuinely distinct
The Son is "with" God (John 1:1). The Father sends the Son (John 3:17). The Son prays to the Father (John 17). The Son asks the Father to send "another Helper", the Spirit (John 14:16). At Jesus' baptism all three appear at once (Matthew 3:16-17). This rules out the view that God is one person wearing three masks.
Drop any one of these three truths and the puzzle disappears, but only by discarding part of the biblical evidence. Drop (1) and you get polytheism. Drop (2) and you get Arianism, where the Son is a lesser creature. Drop (3) and you get modalism. The doctrine of the Trinity is simply the refusal to drop any of them.
A unique being should be expected
| Claim | Contradiction? | Why |
|---|---|---|
| One God and three Gods | Yes | "God" used in the same sense both times |
| One person and three persons | Yes | "Person" used in the same sense both times |
| One being in three persons | No | Being and person answer different questions |
Some find it suspicious that God is unlike anything else. But if a Creator exists, we would expect him to be unlike his creation. Human beings are one being, one person. Rocks are one being, no person. It is not irrational to think the Creator's way of being might be richer than ours: one being, three persons. Theologians call this a mystery, a truth revealed by God that we can state coherently but cannot exhaustively comprehend. A mystery is not a contradiction.
Why it matters
The Trinity is not a puzzle for its own sake. It means God did not create the world because he was lonely or needed someone to love. Love was already eternal within God's own life: "God is love" (1 John 4:8), because the Father has always loved the Son in the Spirit (John 17:24). The gospel is the invitation to be brought into that love through the Son, by the Spirit, to the Father (Ephesians 2:18).
Word study
hebrew · “one” · Deuteronomy 6:4
The ordinary Hebrew word for 'one'. It does not by itself prove plurality in God, and Christians should not overstate it. But it is the same word used for the 'one flesh' of husband and wife (Genesis 2:24) and for a single cluster of grapes (Numbers 13:23). It denotes a genuine unity without forbidding internal distinctions.
greek · “underlying reality, substance; later 'person'” · Hebrews 1:3
In Hebrews 1:3 the Son is the exact imprint of God's hypostasis, meaning his very being. In the fourth century the Cappadocian Fathers gave the word a technical sense: one ousia (being) in three hypostaseis (persons). The later vocabulary is a tool for stating clearly what Scripture already says, not a new revelation.
“But what about…?”
Isn't 'one being, three persons' just a word game?
No. We already distinguish 'what' something is from 'who' someone is. You and I share one human nature but are two persons. The Trinity is unlike us in that the three persons do not each possess a separate copy of the divine nature: they share the one, undivided being of God. The distinction is real even if its inner workings exceed our grasp.
Can you give me an analogy?
Use analogies cautiously. Water, ice and steam suggests one person in three modes (the ancient error of modalism). An egg's shell, white and yolk suggests three parts of God (partialism). C. S. Lewis's image of a cube, made of six squares yet one object, at least shows how a higher dimension can unite what is separate at a lower one. Every analogy breaks down because God is unique.
If it's beyond understanding, why should I believe it?
Beyond full comprehension is not the same as contrary to reason. Physicists accept that light behaves as both wave and particle because the evidence demands it, though no picture captures it. Christians confess the Trinity because the evidence of Scripture demands it. A God small enough to fit entirely in our heads would not be God.
Doesn't the New Testament just call the Father 'God'?
Usually, yes, but not exclusively. Jesus is called God in John 1:1, John 20:28, Titus 2:13 and Hebrews 1:8, and the Spirit is treated as God in Acts 5:3-4. The New Testament also applies Old Testament passages about the LORD directly to Jesus (compare Isaiah 45:23 with Philippians 2:10-11).
Where Christians differ
Go deeper
- book · 1952Mere Christianity (Book IV, 'Beyond Personality')C. S. Lewis
- book · 2010The Deep Things of God: How the Trinity Changes EverythingFred Sanders
- book · 2012Delighting in the TrinityMichael Reeves
- book · 1979The Orthodox WayKallistos Ware
- ancientOn 'Not Three Gods' (To Ablabius)Gregory of Nyssa
- ancientOn the Trinity (De Trinitate)Augustine
Sources (4)
- Aristotle, Metaphysics IV.3 (1005b): the law of non-contradiction, that the same attribute cannot belong and not belong to the same subject in the same respect
- Gregory of Nyssa, To Ablabius (On 'Not Three Gods')
- Catechism of the Catholic Church, paragraphs 232–267
- Richard Bauckham, Jesus and the God of Israel (2008), on 1 Corinthians 8:6 as a reworking of the Shema
Related questions
If the word 'Trinity' isn't in the Bible, where does it come from?
The word 'Trinity' is a one-word summary, like 'monotheism' or 'incarnation', neither of which is in the Bible either. What matters is whether the teaching is there. The New Testament repeatedly names Father, Son and Spirit together, calls each divine, and insists there is one God. Within about a century of the apostles, Christians coined the Greek word trias and the Latin trinitas to summarize what they found.
If Jesus is God, who was He praying to?
Jesus wasn't praying to himself. He, the Son, was praying to the Father, a distinct person. The objection would refute the idea that Jesus and the Father are the same person, but Christians have never believed that. And because the Son truly became human, he lived a fully human life of dependence, including prayer. His prayers show his true humanity and his relationship with the Father; they do not cancel his deity.
Is the Holy Spirit a person or just a force?
Scripture uses impersonal images for the Spirit, but it also does things with him that only make sense for a person: he speaks, teaches, decides, intercedes, can be lied to and can be grieved. Jesus calls him 'another Helper' like himself. A force can be used; it cannot be insulted, cannot will and cannot love. The Bible presents the Spirit as a 'he', the third person of the one God.
Doesn't John 1:1 say the Word was 'a god'?
The missing article does not make theos indefinite. In Greek a predicate noun placed before the verb often lacks the article for reasons of word order and emphasis. Most grammarians read theos here as qualitative: the Word has the very nature of God. 'A god' also creates a problem the Bible won't allow: a second, lesser god beside the one true God, who says there is no other (Isaiah 44:6-8).
This entry is a draft and has not yet been theologically reviewed.