One God in Three Persons

There is one God, eternally existent in three Persons: Father, Son, and Holy Spirit. Each Person is fully God, sharing the same divine essence, yet they are distinct in their relations and roles.

Go, and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit,
— Matthew 28:19 (WEB)

Note

The Trinity is not a contradiction — it is the mystery at the heart of Christian worship and the foundation of God's self-giving love.

Bible references

Deuteronomy 6:4 · Matthew 28:19 · 2 Corinthians 13:14 · John 1:1-3 · John 14:16-17 · 1 Peter 1:2