Definition of the Union of the Divine and Human Natures in the Person of Christ
Council of Chalcedon, 451 A.D., Act V
Therefore, following the holy fathers, we all with one accord teach men to acknowledge one and the same Son, our Lord Jesus Christ, at once complete in Godhead and complete in manhood, truly God and truly man, consisting also of a reasonable soul and body; of one substance (homoousios) with the Father as regards his Godhead, and at the same time of one substance with us as regards his manhood; like us in all respects, apart from sin; as regards his Godhead, begotten of the Father before the ages, but yet as regards his manhood begotten, for us men and for our salvation, of Mary the Virgin, the God-bearer (Theotokos); one and the same Christ, Son, Lord, Only-begotten, recognized in two natures, without confusion, without change, without division, without separation; the distinction of natures being in no way annulled by the union, but rather the characteristics of each nature being preserved and coming together to form one person and subsistence, not as parted or separated into two persons, but one and the same Son and Only-begotten God the Word, Lord Jesus Christ; even as the prophets from earliest times spoke of him, and our Lord Jesus Christ himself taught us, and the creed of the Fathers has handed down to us.
Quicunque Vult
commonly called
The Creed of Saint Athanasius
Which Faith except everyone do keep whole and undefiled, without doubt he shall perish everlastingly.
And the Catholic Faith is this: That we worship one God in Trinity, and Trinity in Unity, neither confounding the Persons, nor dividing the Substance.
For there is one Person of the Father, another of the Son, and another of the Holy Ghost.
But the Godhead of the Father, of the Son, and of the Holy Ghost, is all one, the Glory equal, the Majesty co-eternal.
Such as the Father is, such is the Son, and such is the Holy Ghost.
The Father uncreate, the Son uncreate, and the Holy Ghost uncreate.
The Father incomprehensible, the Son incomprehensible, and the Holy Ghost incomprehensible.
The Father eternal, the Son eternal, and the Holy Ghost eternal.
And yet they are not three eternals, but one eternal.
As also there are not three incomprehensibles, nor three uncreated, but one uncreated, and one incomprehensible.
So likewise the Father is Almighty, the Son Almighty, and the Holy Ghost Almighty.
And yet they are not three Almighties, but one Almighty.
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