📖 Biblical Definition
Trinitarian theology is the bedrock of Christian orthodoxy. There is one God (Deuteronomy 6:4) who exists eternally as three distinct Persons: the Father, the Son, and the Holy Spirit. Each Person is fully God, yet there are not three Gods but one. Jesus commanded baptism "in the name of the Father and of the Son and of the Holy Spirit" (Matthew 28:19) — one name, three Persons. The Son is eternally begotten of the Father; the Spirit proceeds from the Father (and the Son, per the Western tradition). The Persons are distinguished by their eternal relations, not by degrees of deity. The Trinity is not a problem to be solved but a mystery to be worshipped.
📜 Webster 1828 Definition
One who believes in the doctrine of the Trinity.
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TRINITA'RIAN, n. One who believes the doctrine of the Trinity. TRIN'ITY, n. [L. trinitas.] In theology, the union of three persons in one Godhead; the Father, Son, and Holy Spirit. Webster understood the Trinity as fundamental Christian doctrine, not a debatable opinion.
📖 Key Scripture
• Matthew 28:19 — "Baptizing them in the name of the Father and of the Son and of the Holy Spirit."
• 2 Corinthians 13:14 — "The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all."
• John 1:1-3 — "In the beginning was the Word, and the Word was with God, and the Word was God."
• Deuteronomy 6:4 — "Hear, O Israel: The LORD our God, the LORD is one."
• Acts 5:3-4 — "You have not lied to man but to God." (The Holy Spirit identified as God.)
⚠️ Modern Corruption
The Trinity is trivialized, denied, or reduced to a social model for egalitarianism.
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Anti-Trinitarian heresies persist in groups like Oneness Pentecostals (modalism), Jehovah's Witnesses (Arianism), and Mormonism (tritheism). Within orthodox-professing churches, the Trinity is often so poorly taught that most laypeople could not distinguish between orthodox Trinitarianism and modalism. Progressive theologians have also weaponized the Trinity as a model for human social relations — arguing that the "mutual submission" within the Godhead proves egalitarianism in gender roles. This collapses the Creator-creature distinction and turns the incomprehensible God into a prop for ideology. The Trinity is not an analogy for human politics; it is the self-revelation of the infinite God.
Usage
• "Trinitarian faith is not optional Christianity — it is Christianity. Deny the Trinity and you have denied the God of Scripture."
• "The Trinity is not a puzzle to be solved with clever analogies but a mystery to be received with worship."
• "Every prayer is Trinitarian: we pray to the Father, through the Son, in the power of the Holy Spirit."