The Nicene Creed (325 CE): This is the primary authoritative document defining the Trinity. It was established to resolve theological disputes and clearly states that the Son is 'of one being' (consubstantial) with the Father.
The Apostles' Creed: A shorter, foundational statement of faith structured around the three persons of the Trinity, used widely in Christian liturgy and baptismal rites.
Scriptural Basis: While the word 'Trinity' does not appear in the Bible, the doctrine is derived from passages where the Father, Son, and Spirit are mentioned together, such as the Great Commission or the baptism of Jesus.
| Term | Definition | Theological Context |
|---|---|---|
| Essence (Ousia) | The 'what' of God; the divine nature. | There is only ONE divine essence shared by all three. |
| Person (Hypostasis) | The 'who' of God; the individual expression. | There are THREE distinct persons who possess the essence. |
| Economic Trinity | God's interaction with the created world. | Focuses on the specific roles (Creator, Redeemer, Sanctifier). |
| Ontological Trinity | God's internal nature and relationship. | Focuses on the eternal relationship between the three persons. |
Avoid the 'Three Gods' Trap: Always emphasize that Christianity is monotheistic. If an exam question asks about the Trinity, ensure you use the phrase 'One God in three persons' to avoid the error of tritheism.
Use Creedal Language: Terms like 'consubstantial,' 'incarnate,' and 'proceeds' are high-value keywords. Using these correctly demonstrates a deep understanding of the formal doctrine.
Relate Roles to Impact: When discussing the persons, connect their roles to how they influence a believer's life (e.g., the Son provides empathy because he experienced human suffering).
Check for Balance: Ensure you don't over-emphasize one person at the expense of the others; the doctrine requires that all three are co-equal and co-eternal.
Modalism: The error of thinking God is one person who simply wears three different 'masks' or takes on three different modes at different times. In the Trinity, the persons are distinct and exist simultaneously.
Partialism: The misconception that the Father, Son, and Spirit are each 'one-third' of God. Each person is fully and completely God, not a part of a whole.
Arianism: The belief that the Son was a created being and not eternal. The Trinity asserts that the Son is 'begotten, not made' and has always existed.
