Council of Chalcedon, 451

man nature, like unto us in all things except sin, [cf. Heb. 4:15]; indeed born of the Father before the ages according to divine nature, but in the last days the same born of the virgin Mary, Mother of God according to human nature; for us and for our deliverance, one and the same Christ only begotten Son, our Lord, acknowledged in two natures,¹ without mingling, without change, indivisibly, undividedly, the distinction of the natures nowhere removed on account of the union but rather the peculiarity of each nature being kept, and uniting in one person and substance, not divided or separated into two persons, but one and the same Son only begotten God Word, Lord Jesus Christ, just as from the beginning the prophets taught about Him and the Lord Jesus Himself taught us, and the creed of our fathers has handed down to us.

Therefore, since these have been arranged by us with all possible care and diligence, the holy and ecumenical synod has declared that no one is allowed to profess or in any case to write up or to compose or to devise or to teach others a different faith.

vine nature, consubstantial with us according to the human nature, like unto us in all things except sin [cf. Heb. 4:15]: indeed born of the Father before the ages according to divinity, but in the latest days the same born of the virgin Mary, Mother of God according to the humanity; for us and for our salvation, one and the same Christ, only begotten Son, our Lord, acknowledged in two natures without mingling, without change, indivisibly, undividedly, the distinction of the natures removed on account of the union, but rather the uniqueness of each nature being kept and uniting in one person and one substance, not divided or separated into two persons, but one and the same Son only begotten God Word, Lord Jesus Christ, just as from the beginning the prophets taught about Him and the Lord Jesus Christ Himself taught us, and as the creed of the Fathers has handed down to us [see n. 54 86].

Therefore, since these having been arranged by us with all possible care and diligence, the sacred and universal Synod has declared that no one is allowed to profess or to write up or to compose or to devise or to teach others a different faith.