Apologetics · FaithLogic
1 John 5:20 — "This Is the True God and Eternal Life": Does It Mean Jesus?
1 John 5:20 ends: "…in his Son Jesus Christ. This one (houtos) is the true God and eternal life." If "this one" is Jesus, the apostle John calls him "the true God" — the same phrase Jesus uses of the Father in John 17:3. The identification of the antecedent is genuinely debated; this section lays out both readings and why the Christ reading is the stronger one.
The Grammatical Question — Honestly
The two readings
The text (1 John 5:20): "And we know that the Son of God has come and has given us understanding, so that we may know him who is true; and we are in him who is true, in his Son Jesus Christ. This one (houtos) is the true God (ho alēthinos Theos) and eternal life."
Reading A — "this one" = Jesus Christ. The nearest noun before houtos is "his Son Jesus Christ," and a demonstrative pronoun most often points to the nearest preceding noun. On this reading John directly calls Christ "the true God."
Reading B — "this one" = "him who is true" (the Father). The whole sentence is about knowing "him who is true," and a demonstrative can point back to the main subject of a sentence rather than the last word in it. On this reading John is restating that the Father — the one we now truly know through the Son — is the true God.
Grammar alone does not settle it. Murray Harris, in his full study Jesus as God (1992), works through every option and concludes that the reference to Christ is probable but not certain — which is the fair verdict. So this verse belongs in the cumulative case as a likely witness, not as a knock-down proof.
Reading A — "this one" = Jesus Christ. The nearest noun before houtos is "his Son Jesus Christ," and a demonstrative pronoun most often points to the nearest preceding noun. On this reading John directly calls Christ "the true God."
Reading B — "this one" = "him who is true" (the Father). The whole sentence is about knowing "him who is true," and a demonstrative can point back to the main subject of a sentence rather than the last word in it. On this reading John is restating that the Father — the one we now truly know through the Son — is the true God.
Grammar alone does not settle it. Murray Harris, in his full study Jesus as God (1992), works through every option and concludes that the reference to Christ is probable but not certain — which is the fair verdict. So this verse belongs in the cumulative case as a likely witness, not as a knock-down proof.
Why the Christ reading is the stronger one: "and eternal life"
The clause does not say "this is the true God." It says "this is the true God and eternal life" — two titles joined. And "the eternal life" is a title John has already, unmistakably, given to Christ in the same letter:
— 1 John 1:2 — "the eternal life, which was with the Father and was made manifest to us." That is the Son.
— 1 John 5:11–12 — "this life is in his Son. Whoever has the Son has life."
— And in the Gospel, John 11:25 — Jesus: "I am the resurrection and the life"; John 14:6 — "I am… the life."
So the second half of the compound title ("eternal life") is Christ's without dispute. The most natural reading of a single pronoun governing both halves is that both halves describe the same person — Christ. That is the internal argument that tips it: the phrase's own back half identifies its subject.
— 1 John 1:2 — "the eternal life, which was with the Father and was made manifest to us." That is the Son.
— 1 John 5:11–12 — "this life is in his Son. Whoever has the Son has life."
— And in the Gospel, John 11:25 — Jesus: "I am the resurrection and the life"; John 14:6 — "I am… the life."
So the second half of the compound title ("eternal life") is Christ's without dispute. The most natural reading of a single pronoun governing both halves is that both halves describe the same person — Christ. That is the internal argument that tips it: the phrase's own back half identifies its subject.
This is also the answer to the John 17:3 objection
The objection: "Jesus calls the Father 'the only true God' in John 17:3 — so the Son is not that God."
The reply does not depend on 1 John 5:20 alone. In John 17:3 the word doing the work is "only" — the only true God, as opposed to the false gods of the nations (the same contrast runs through 1 John 5:21, which ends "keep yourselves from idols"). "Only true God" excludes idols; it does not, in John's usage, exclude the Son, because the same John opens his Gospel "the Word was God" (John 1:1), calls the Son "the only God" / "God the only Son" at the Father's side (John 1:18, best manuscripts), and records Thomas addressing Jesus as "my Lord and my God" without correction (John 20:28). 1 John 5:20, on the stronger reading, simply makes explicit what the rest of John's writing already says.
The reply does not depend on 1 John 5:20 alone. In John 17:3 the word doing the work is "only" — the only true God, as opposed to the false gods of the nations (the same contrast runs through 1 John 5:21, which ends "keep yourselves from idols"). "Only true God" excludes idols; it does not, in John's usage, exclude the Son, because the same John opens his Gospel "the Word was God" (John 1:1), calls the Son "the only God" / "God the only Son" at the Father's side (John 1:18, best manuscripts), and records Thomas addressing Jesus as "my Lord and my God" without correction (John 20:28). 1 John 5:20, on the stronger reading, simply makes explicit what the rest of John's writing already says.
How the Church Read It
The fathers
Athanasius, Four Discourses Against the Arians 3.24 cites the verse of the Son: "we are in Him that is true, in His Son Jesus Christ; this is the true God — therefore the Son is true God." Athanasius uses it against the Arian claim that only the Father is "the true God."
Ambrose, On the Christian Faith (De Fide) 3.5 makes the same argument: John says "that we may be in His true Son. This is the true God" — "the Son, therefore, is true God," of one substance with the Father.
Cyril of Alexandria, commenting on John 17:3, argues that "the only true God" cannot exclude the Son, and points to 1 John 5:20 as John's own clarification that the Son is "true God."
The Latin commentary tradition (Bede, On the Seven Catholic Epistles) reads "hic est verus Deus" of Christ without hesitation. The Arians, who would have welcomed reading it of the Father, did not — because the church's reading was already fixed on the Son.
Ambrose, On the Christian Faith (De Fide) 3.5 makes the same argument: John says "that we may be in His true Son. This is the true God" — "the Son, therefore, is true God," of one substance with the Father.
Cyril of Alexandria, commenting on John 17:3, argues that "the only true God" cannot exclude the Son, and points to 1 John 5:20 as John's own clarification that the Son is "true God."
The Latin commentary tradition (Bede, On the Seven Catholic Epistles) reads "hic est verus Deus" of Christ without hesitation. The Arians, who would have welcomed reading it of the Father, did not — because the church's reading was already fixed on the Son.
Where Jesus is called "God" more plainly
1 John 5:20 is one link in a chain, not the whole case:
— John 1:1 — "the Word was God" (see the Pre-Existence and I AM sections).
— John 20:28 — Thomas: "My Lord and my God" — addressed to Jesus, accepted by him.
— Romans 9:5 — "Christ… who is God over all, blessed forever" (see that section for the grammar and the fathers).
— Titus 2:13; 2 Peter 1:1 — "our great God and Saviour Jesus Christ" (see the Granville Sharp section).
— Hebrews 1:8 — the Father to the Son: "Your throne, O God, is forever and ever." (A minority render this "God is your throne"; the majority of translations and the Greek fathers keep the vocative — the Father addressing the Son as God.)
— John 1:1 — "the Word was God" (see the Pre-Existence and I AM sections).
— John 20:28 — Thomas: "My Lord and my God" — addressed to Jesus, accepted by him.
— Romans 9:5 — "Christ… who is God over all, blessed forever" (see that section for the grammar and the fathers).
— Titus 2:13; 2 Peter 1:1 — "our great God and Saviour Jesus Christ" (see the Granville Sharp section).
— Hebrews 1:8 — the Father to the Son: "Your throne, O God, is forever and ever." (A minority render this "God is your throne"; the majority of translations and the Greek fathers keep the vocative — the Father addressing the Son as God.)
💡 1 John 5:20 — Reasonable Summary"The antecedent of 'this one is the true God' is debated: nearest-noun grammar points to Jesus Christ; sentence-subject grammar points to the Father. Murray Harris (Jesus as God) concludes the Christ reading is probable, not certain — so this is a likely witness, not a proof. The internal argument that tips it: the title is 'the true God and eternal life,' and 'the eternal life' is Christ's without dispute (1 John 1:2; 5:11–12), so the single pronoun most naturally makes both halves describe Christ. Athanasius (Against the Arians 3.24), Ambrose (De Fide 3.5) and Cyril all read it of the Son and used it against the Arians. It confirms — it does not carry alone — the plainer texts: John 1:1, John 20:28, Romans 9:5, Titus 2:13."
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