Arianism and the full divinity of the Son
Nicaea I
325 ADNicaea
First Council of Nicaea
The first ecumenical council answered the claim that the Son was a creature and confessed that the Son is truly God from God.
Emperor Constantine
Traditionally remembered as 318 bishops
Outcome
What the council decided
Produced the Nicene Creed's confession of the Son as begotten, not made, and of one essence with the Father.
Why it matters
The doctrine at stake
Nicaea protects the gospel itself: if Christ is not truly God, then worship, salvation, baptism, and prayer lose their Christian center.
Council teaching
Core Nicene confession
The council confessed Jesus Christ as the Son of God, begotten from the Father, true God from true God, begotten not made, and of one essence with the Father.
It rejected the claim that there was a time when the Son was not, or that the Son belongs to the order of created things.
Controversy explained
The Arian controversy
Arius wanted to preserve the uniqueness of the Father by saying the Son was exalted above creation but still made. The council judged that this destroyed Christian worship and salvation.
The central question was not abstract philosophy. Christians prayed to Christ, were baptized into his name, and trusted him for salvation. Nicaea insisted that this only makes sense if the Son is truly God.
Study path
How to understand it
The crisis
The Church had to answer whether Jesus Christ is truly divine or the greatest of created beings.
The confession
The council used precise language to guard biblical worship of the Son.
The reception
The council did not end the controversy instantly; Athanasius and later fathers defended its meaning.
Reception
How the traditions receive it
Catholic
Received as the first ecumenical council and a foundation for Trinitarian doctrine, creed, worship, and later catechesis.
Orthodox
Received as the decisive conciliar confession of the Son's full divinity, defended especially through Athanasius and the Cappadocians.
Protestant
Classical Protestant traditions generally receive Nicaea as a faithful summary of biblical Trinitarian doctrine.
Oriental Orthodox
Received as fully ecumenical and foundational for the shared pre-Chalcedonian faith.
Key terms
Words to know
Arianism
The teaching associated with Arius that the Son was made and therefore not eternal God in the same sense as the Father.
Homoousios
Of one essence; the word used to confess that the Son shares the same divine being as the Father.
Begotten, not made
The Son is eternally from the Father, not a creature brought into existence.
Scripture
Biblical connections
John 1:1-18John 20:28Colossians 1:15-20Hebrews 1:1-4
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