Definition of Chalcedon

Following, then, the holy fathers, we unite in teaching all men to confess the one and same Son, our Lord Jesus Christ. This selfsame one is perfect both in deity and in humanity; truly God and truly man, with a rational soul and a body; consubstantial with the Father according to His deity, and consubstantial with us according to the humanity; like us in all respects, sin only excepted. Before the ages He was begotten of the Father, according to the deity, and in these last days, for us and for our salvation, He was born of Mary the virgin, who is God-bearer according to His humanity; one and the same Christ, Son, Lord, only-begotten, to be acknowledged in two natures; without confusing them, without interchanging them, without dividing them, and without separating them; the distinction of natures by no means taken away by the union, but the properties 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 only begotten Son, the Lord Jesus Christ, as from the beginning the prophets have declared concerning Him, and the Lord Jesus Christ Himself has taught us, and the symbol of the fathers has handed down to us.