Nicene-Constantinople Creed (381AD)

We believe in one God, the Father, the Almighty, Maker of heaven and earth, of all that is seen and unseen.

      We believe in one Lord Jesus Christ, the only Son of God, eternally begotten of the Father; God from God, Light from Light, true God from true God; begotten not made, one in being with the Father. Through Him all things were made. For us men and for our salvation He came down from heaven. By the power of the Holy Spirit He was born of the Virgin Mary and became man. For our sake He was crucified under Pontius Pilate. He suffered, died, and was buried. On the third day He rose again, in fulfillment of the Scriptures. He ascended into heaven and is seated at the right hand of the Father. He will come again in glory to judge the living and the dead, and His kingdom will have no end.

      We believe in the Holy Spirit, the Lord, the Giver of life, who proceeds from the Father and the Son. With the Father and the Son He is worshipped and glorified. He has spoken through the prophets.

      We believe in one, holy, catholic, and apostolic Church. We acknowledge one baptism for the forgiveness of sins. We look for the resurrection of the dead and the life of the world to come. Amen.

Definition of Chalcedon (451 AD)

We, then, following the holy Fathers, all with one consent, teach men to confess one and the same Son, our Lord Jesus Christ, the same perfect in Godhead and also perfect in manhood; truly God and truly man, of a rational soul and body; consubstantial with the Father according to the Godhead, and consubstantial with us according to the Manhood; in all things like unto us, without sin; begotten before all ages of the Father according to the Godhead, and in these latter days, for us and for our salvation, born of the Virgin Mary, the Mother of God, according to the Manhood; one and the same Christ, Son, Lord, only begotten, to be acknowledged in two natures, inconfusedly, unchangeably, indivisibly, inseparably; the distinction of natures being by no means taken away by the union, but rather the property of each nature being preserved, and concurring in one Person and one Subsistence, not parted or divided into two persons, but one and the same Son, and only begotten, God the Word, the Lord Jesus Christ; as the prophets from the beginning [have declared] concerning Him, and the Lord Jesus Christ Himself has taught us, and the Creed of the holy Fathers has handed down to us.