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The doctrine of the Trinity — one God eternally existing in three persons: Father, Son, and Holy Spirit — is the foundational doctrine of Christian theology. While the word 'Trinity' does not appear in Scripture, the concept is woven throughout both Testaments. The Father is God (John 6:27), the Son is God (John 1:1), and the Holy Spirit is God (Acts 5:3–4), yet there is only one God (Deuteronomy 6:4).
"Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit."
"In the beginning was the Word, and the Word was with God, and the Word was God."
"May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all."
"Hear, O Israel: The Lord our God, the Lord is one."
"I and the Father are one."
The Trinity is not explicitly named in the Old Testament, but hints appear throughout. Genesis 1:26 uses the plural 'Let us make mankind.' Isaiah 48:16 distinguishes the Lord, the Servant, and the Spirit. The Shema (Deuteronomy 6:4) uses the Hebrew word echad for 'one,' which can denote a composite unity (as in Genesis 2:24, where husband and wife become 'one flesh').
The Trinity is not three gods (tritheism) or one God wearing three masks (modalism) — both are heresies. The orthodox formulation, established at the Council of Nicaea (325 AD), is one divine essence (substance) in three distinct persons. Each person is fully God, yet there is only one God. This is a mystery that transcends human categories, not a logical contradiction.
The Trinity reveals that God is inherently relational — love existed within the Godhead before creation (John 17:24). This grounds human community and love. The Trinity also explains salvation: the Father planned it, the Son accomplished it, and the Spirit applies it (Ephesians 1:3–14). Worship, prayer, and the Christian life are all Trinitarian in structure.