Friday, May 29, 2026

The First Ecumenical Council: The Council of Nicaea By Father Glenn Baaten

The first of the seven Ecumenical Councils of the undivided Church was the First Council of Nicaea. Convened in 325 AD by Roman Emperor Constantine the Great with the support of Pope Sylvester I, the council met from May through July in the Greek-speaking city of Nicaea, located in Asia Minor, modern-day Turkey. More than 300 bishops from across the Christian world—both East and West—gathered to address one of the most pressing theological crises of the time.

At the heart of the council was the controversy sparked by Arius, a popular and influential priest from Alexandria. Arius taught that Jesus Christ, while exalted above all creation, was not fully divine in the same way as God the Father. He argued that the Son had a beginning—summarized in his striking phrase: “there was a time when the Son was not.”

According to Arius, if the Father “begot” the Son, then the Son must have come into existence at some point in time. This meant that Christ, though the highest and most glorious of God’s creations and the agent through whom the universe was made, was still a creature—not equal to the Father in eternal divinity. For Arius, the key idea was clear: Jesus was created, not eternal.

This teaching spread rapidly and gained significant support throughout the Church. Its influence became so widespread that it has been estimated a large portion – up to half - of Christians in the following decades leaned toward Arian beliefs. Concerned about both theological truth and the unity of his empire, Constantine called the council to settle the issue decisively.

The bishops at Nicaea overwhelmingly rejected Arianism. In response, they produced the original form of the Nicene Creed, affirming the full divinity of Christ. Central to their declaration was the term homoousios—meaning “of the same substance.” This word expressed that the Son is not merely similar to the Father, but fully shares in the same divine nature.

The creed makes this explicit: Christ is “begotten, not made.” He is eternally begotten of the Father, not created, and is consubstantial with the Father and the Holy Spirit. As the second Person of the Trinity, He possesses the fullness of the Godhead and has no beginning. For our salvation, this eternal Son “came down from heaven” and was incarnate by the Holy Spirit in the womb of the Virgin Mary.

A single letter became the focal point of the debate. You may have heard the phrase, “it doesn’t make an iota of difference.” In this case, it made all the difference. An iota—the smallest letter in the Greek alphabet—distinguished two crucial Christological terms. Arius preferred homoiousios (“of similar substance”), while the council affirmed homoousios (“of the same substance”). That one small difference safeguarded the Church’s understanding of Christ’s true divinity.

As concerns Jesus Christ, the Son, the unified voice of the Church at Nicaea gave us a lasting gift: the Nicene Creed, still proclaimed by Christians around the world today:

 

I believe in one Lord Jesus Christ, the Only Begotten Son of God,
born of the Father before all ages.
God from God, Light from Light, true God from true God,
begotten, not made, consubstantial with the Father;
through him all things were made.
For us men and for our salvation he came down from heaven,
and by the Holy Spirit was incarnate of the Virgin Mary,
and became man.

 

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