The Trinity

Matthew 28:19; John 1:1-14; 2 Corinthians 13:14

The Doctrine in One Sentence

There is one God, eternally existing in three persons — Father, Son, and Holy Spirit — each fully God, yet there is only one God. Not three gods; not one person wearing three masks; one divine Being, three distinct persons.

Where Scripture Teaches It

The word "Trinity" isn't in the Bible; the reality is everywhere:

  • One God — Deuteronomy 6:4; Isaiah 45:5.
  • The Father is God — John 6:27; the Son is God — John 1:1, 20:28; Titus 2:13; the Spirit is God — Acts 5:3-4.
  • All three together — Jesus' baptism (Matthew 3:16-17: Son in the water, Spirit descending, Father speaking); the baptismal formula, one name, three persons (Matthew 28:19); the benediction (2 Corinthians 13:14).

The Classic Errors

The doctrine was clarified against real mistakes, each still around:

  • Modalism — one person in three modes/costumes. Fails at Jesus' baptism: all three present at once.
  • Arianism — the Son as highest creature, not fully God. Answered at Nicaea (AD 325): the Son is "of one being with the Father."
  • Tritheism — three gods. Scripture's monotheism forbids it.

Why It Matters

  1. God is love eternally — love requires a beloved; Father, Son, and Spirit have loved from before creation (John 17:24). God didn't need to create to have someone to love.
  2. Salvation is Trinitarian — the Father sends, the Son accomplishes, the Spirit applies (Ephesians 1:3-14). Every rescue is a joint operation.
  3. Prayer makes sense — we pray to the Father, through the Son, in the Spirit (Ephesians 2:18).

Kingdom Connection

The Kingdom of God is the reign of the triune God — the Father's plan, established through the Son ("the kingdom of his beloved Son," Colossians 1:13), experienced in the Spirit ("righteousness, peace and joy in the Holy Spirit," Romans 14:17).

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