How can God be three persons yet one God?
Question 2027
“Three persons but one God” sounds, on first hearing, like a straightforward contradiction. If there are three persons, surely there are three gods? If there is only one God, how can there be three persons? The objection is natural, and it deserves a direct answer rather than a retreat into vague appeals to mystery. The mystery is real, but it is not where the objection thinks it is.
The Objection Misunderstands the Claim
Christians do not claim that God is three persons and one person. That would be a logical contradiction — and it is not the Christian doctrine. Christians also do not claim that God is three gods and one God. That would be equally self-contradictory — and again, it is not the Christian doctrine. The claim is that God is one in one sense and three in a different sense. One what, three whos. One in being or essence; three in distinct personhood. Once this is stated clearly, the logical contradiction evaporates, even if the underlying reality remains beyond full comprehension.
The technical Trinitarian language, settled at the Council of Nicaea in 325 AD and refined at Constantinople in 381 AD, expressed it as one ousia (being or substance) and three hypostaseis (persons or subsistences). These terms were chosen with precision to express exactly the distinction between the sense in which God is one and the sense in which God is three. The Father, the Son, and the Holy Spirit share one divine nature — everything that makes God who He is belongs equally and fully to each of the three persons. There is not one-third of deity in each person. Each person is fully and completely God.
What “Person” Does Not Mean
Part of the confusion comes from the word “person.” In everyday speech, three persons means three separate individuals, each with their own body, their own independent existence, their own centre of consciousness distinct from all others. Three human persons are three human beings. But the three persons of the Trinity do not have three separate divine essences. They share one divine nature, as three human persons do not share one human nature. The analogy is imperfect in both directions, which is why no analogy for the Trinity is fully adequate. What matters is the logical structure: one in being, three in personal identity and relationship.
Why Not Three Gods?
Tritheism — the view that Father, Son, and Spirit are simply three separate divine beings — founders on the Bible’s absolute insistence on the unity of God. Deuteronomy 6:4 declares: “The LORD our God, the LORD is one.” Isaiah 45:5: “I am the LORD, and there is no other, besides me there is no God.” The New Testament maintains this without qualification (1 Corinthians 8:4; 1 Timothy 2:5). Three divine beings with three separate divine essences would be three gods, and that is precisely what Scripture everywhere prohibits.
Why Not One Person in Three Modes?
The opposite error, called modalism, teaches that Father, Son, and Spirit are not three distinct persons but three different modes or manifestations of one divine person — three roles adopted by the same being at different times or in different contexts. This has a certain simplicity to it, but it flatly contradicts what Scripture actually shows.
At the baptism of Jesus (Matthew 3:16-17), all three are simultaneously present and distinguishable: the Son standing in the water, the Father speaking from heaven, the Spirit descending visibly as a dove. These are not three sequential appearances of one person. They are three simultaneously present, distinct realities. Jesus prays to the Father throughout the Gospels — an act that would be strange to the point of incoherence if Father and Son were simply two names for the same person. The Father sends the Son (John 3:17). The Son intercedes with the Father (Romans 8:34). The Father and Son together send the Spirit (John 15:26). These are genuine relationships between genuinely distinct persons, not internal monologues of a single actor playing different parts.
The Shape of the Distinction
What distinguishes the three persons is not their divine nature — that they share equally — but their personal relations and roles within the Godhead. The Father is unbegotten. The Son is eternally begotten of the Father (John 1:14, 18; Hebrews 1:5). The Spirit proceeds from the Father and the Son (John 15:26; 16:7). These eternal relations of origin are what distinguish the three persons from one another, not any difference in divine attributes, power, or status.
Ian holds the eternal functional subordination of the Son to the Father. The Son’s submission to the Father is not purely a feature of the incarnation — it reflects the eternal relational ordering within the Godhead. Crucially, this is functional, not ontological. The Son is co-equal with the Father and the Spirit in every attribute of deity. The Father initiates; the Son fulfils. The Father sends; the Son is sent. The ordering is relational, not a hierarchy of being.
So, now what?
The Trinity is not primarily a puzzle to be solved. It is a reality to be worshipped. A God who could be fully comprehended within human categories of thought would be limited by human categories of thought — which would mean He was not God at all. The fact that the Trinity exceeds our full grasp is not a mark against it. It is precisely what one should expect when a finite mind encounters an infinite being. When someone objects that the Trinity does not make sense, the honest response is that it does make sense — one in being, three in person, no contradiction — but it is not simple. There is an important difference between those two things.
“Go therefore and make disciples of all nations, baptising them in the name of the Father and of the Son and of the Holy Spirit.” Matthew 28:19
