Niceno-Constantinopolitan Creed (381)

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

And in one Lord Jesus Christ, the only-begotten Son of God, begotten from the Father before all ages, light from light, true God from true God, begotten not made, of one substance with the Father, through Whom all things came into existence, Who because of us men and because of our salvation came down from heaven, and was incarnate from the Holy Spirit and the Virgin Mary and became man, and was crucified for us under Pontius Pilate, and suffered and was buried, and rose again on the third day according to the Scriptures and ascended to heaven, and sits on the right hand of the Father, and will come again with glory to judge living and dead, of Whose kingdom there will be no end;

And in the Holy Spirit, the Lord and life-giver, Who proceeds from the Father, Who with the Father and the Son is together worshipped and together glorified, Who spoke through the prophets; in one holy Catholic and apostolic Church. We confess one baptism to the remission of sins; we look forward to the resurrection of the dead and the life of the world to come. Amen

Kelly, J. N. D. (2006). Early Christian Creeds (Third Edition, pp. 297–298). Continuum.

Excepts from the Council

Through them we wish to make it plain that our disposition is all for peace with unity for its sole object, and that we are full of zeal for the right faith. For we, whether we suffered persecutions, or afflictions, or the threats of emperors, or the cruelties of princes, or any other trial at the hands of heretics, have undergone all for the sake of the evangelic faith, ratified by the three hundred and eighteen fathers at Nicæa in Bithynia. This is the faith which ought to be sufficient for you, for us, for all who wrest not the word of the true faith; for it is the ancient faith; it is the faith of our baptism; it is the faith that teaches us to believe in the name of the Father, of the Son, and of the Holy Ghost. According to this faith there is one Godhead, Power and Substance of the Father and of the Son and of the Holy Ghost; the dignity being equal, and the majesty being equal in three perfect hypostases, i.e. three perfect persons.

Thus there is no room for the heresy of Sabellius by the confusion of the hypostases, i.e. the destruction of the personalities; thus the blasphemy of the Eunomians, of the Arians, and of the Pneumatomachi is nullified, which divides the substance, the nature, dud the godhead, and super-induces on the uncreated consubstantial and co-eternal Trinity a nature posterior, created and of a different substance. We moreover preserve unperverted the doctrine of the incarnation of the Lord, holding the tradition that the dispensation of the flesh is neither soulless nor mindless nor imperfect; and knowing full well that God’s Word was perfect before the ages, and became perfect man in the last days for our salvation.

Let this suffice for a summary of the doctrine which is fearlessly and frankly preached by us, and concerning which you will be able to be still further satisfied if you will deign to read the tome of the synod of Antioch, and also that tome issued last year by the Ecumenical Council held at Constantinople, in which we have set forth our confession of the faith at greater length, and have appended an anathema against the heresies which innovators have recently inscribed.

Schaff, P., & Wace, H., eds. (1900). Council of Constantinople: The Synodical Letter. In H. R. Percival (Trans.), The Seven Ecumenical Councils (Vol. 14, pp. 189–190). Charles Scribner’s Sons.