In May of 381, Emperor Theodosius I convened a council at Constantinople. Its purpose was twofold: (1) to reaffirm the Church’s fidelity to the faith of Nicaea; and (2) to accomplish unity in the Church in the face of numerous and disastrous divisions caused by Arianism.

This council adopted an updated form of the Nicene Creed which is essentially the same as the one recited in the Catholic and Orthodox churches and many other Protestant communities to this day. The Nicene-Constantinopolitan Creed affirmed the divinity of the Holy Spirit and listed the four marks of the true Church: one, holy, catholic, and apostolic.

This is its text:

We believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible;

And in one Lord Jesus Christ, the Son of God, the Only-begotten, Begotten of the Father before all ages, Light of Light, Very God of Very God, Begotten, not made; of one essence with the Father, by whom all things were made:
Who for us men and for our salvation came down from heaven, and was incarnate of the Holy Spirit and the Virgin Mary, and was made man;
And was crucified also for us under Pontius Pilate, and suffered and was buried;
And the third day he rose again, according to the Scriptures;
And ascended into heaven, and sits at the right hand of the Father;
And he shall come again with glory to judge the living and the dead, Whose kingdom shall have no end.

And we believe in the Holy Spirit, the Lord, and Giver of Life, Who proceeds from the Father, Who with the Father and the Son together is worshipped and glorified, Who spoke by the Prophets;

And we believe in one, holy, catholic, and apostolic Church.
We acknowledge one Baptism for the remission of sins.
We look for the Resurrection of the dead,
And the Life of the age to come. Amen.

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