What is the Trinity?

The Trinity is the Christian doctrine that God is one God who exists eternally as three distinct persons — Father, Son, and Holy Spirit. Each person is fully God. There are not three gods. There is one God in three persons.

This is admittedly difficult to grasp, and the difficulty is a feature rather than a bug. We are talking about the infinite God — we should expect that He exceeds our categories. The Trinity is not a contradiction; it is a mystery. A contradiction would be saying God is one person and three persons at the same time. The Trinity says God is one being and three persons — different levels of description.

The doctrine is not found as a neat formula in any single verse, but it is woven through the entire fabric of Scripture.

The oneness of God is established clearly in the Old Testament: "Hear, O Israel: The Lord our God, the Lord is one." (Deuteronomy 6:4). There is only one God.

Yet the New Testament just as clearly identifies all three persons as God. The Father is God (John 6:27). Jesus is called God explicitly — "My Lord and my God" (John 20:28), and "In the beginning was the Word, and the Word was with God, and the Word was God." (John 1:1). The Holy Spirit is called God in Acts 5:3-4, where lying to the Holy Spirit is equated with lying to God.

All three appear simultaneously at the baptism of Jesus — the Son in the water, the Spirit descending as a dove, the Father speaking from heaven (Matthew 3:16-17). The Great Commission baptises in the singular name of "the Father and of the Son and of the Holy Spirit" (Matthew 28:19) — one name, three persons.

The early church did not invent the Trinity. They formulated it to describe what Scripture taught. It took centuries of debate to articulate precisely, but the reality behind the doctrine is present on every page of the New Testament.