The Trinity is the biblical teaching that there is one God who eternally exists in three persons — Father, Son, and Holy Spirit — each fully God, yet there is one God (Matthew 28:19; 2 Corinthians 13:14). It’s a mystery we confess rather than solve. Here’s what Scripture teaches and why it matters.
The Trinity can be defined as God eternally and necessarily existing as three persons, Father, Son, and Holy Spirit, and each person is fully God, and there is one God (Deuteronomy 6:4-5).
- The Trinity is partially revealed in the OT (Psalms 45:6-7).
- There are three distinct persons in the Trinity, and the being of each person is equal to the whole being of God (John 1:1-2).
- There are no differences in deity, attributes, or essential nature between Father, Son, and Holy Spirit. The only distinctions between the members if the Trinity are in the ways they have and will always relate to each other and in the ways they relate to creation (1 Corinthians 15:28).
- The doctrine of the Trinity denies both Tritheism (belief in three Gods) and Modalism (belief in only one person of God who appears in different forms).
- Arianism and Subordinationism denied the full deity of the Son and the Holy Spirit. Through the leadership of Athanasius, both of these were condemned as heresy at the Council of Nicea in AD 325, where it was affirmed that Christ is of the same nature as the Father.
- If God were not triune, the atonement, justification by faith, worship of Christ, God as the source of salvation, the independent and personal nature of God, and the basis of the unity of the universe would all be lost.
- Eternal equality is being but subordination in role has been essential to the church’s doctrine of the Trinity.
Frequently Asked Questions
Is the word “Trinity” in the Bible?
No, but the teaching is: one God (Deuteronomy 6:4), and Father, Son, and Spirit each identified as God and distinguished from one another (Matthew 28:19; 2 Corinthians 13:14). “Trinity” is simply the church’s word for what Scripture reveals.
Is Jesus a lesser God than the Father?
No — Jesus is fully God, “the Word was God” (John 1:1), equal in essence with the Father though distinct in person and voluntarily submissive in His mission (Philippians 2:6–8).
How can God be three and one without contradiction?
God is one in essence and three in person — one “what,” three “whos.” That’s a mystery beyond full comprehension but not a logical contradiction, because “one” and “three” refer to different things.
Related: The Work Of The Holy Spirit and Knowing God: The Trinity
*Resources Added From Wayne Grudem, Systematic Theology
The Doctrine of God – Part 1 – Is There Proof Of God’s Existence?
The Doctrine of God – Part 2 – Characteristics of God
The Doctrine of God – Part 3 – What Is The Trinity?
The Doctrine of God – Part 4 – Creation & God’s Providence
