This chapter contains two principal heads: I. A brief exposition of the doctrine of Christ’s two natures in one person, sec. 1–4. II. A refutation of the heresies of Servetus, which destroy the distinction of natures in Christ, and the eternity of the divine nature of the Son.
1. Proof of two natures in Christ—a human and a divine. Illustrated by analogy, from the union of body and soul. Illustration applied
1. When it is said that the Word was made flesh, we must not understand it as if he were either changed into flesh, or confusedly intermingled with flesh, but that he made choice of the Virgin’s womb as a temple in which he might dwell. He who was the Son of God became the Son of man, not by confusion of substance, but by unity of person. For we maintain, that the divinity was so conjoined and united with the humanity, that the entire properties of each nature remain entire, and yet the two natures constitute only one Christ. If, in human affairs, any thing analogous to this great mystery can be found, the most apposite similitude1 seems to be that of man, who obviously consists of two substances, neither of which however is so intermingled with the other as that both do not retain their own properties. For neither is soul body, nor is body soul. Wherefore that is said separately of the soul which cannot in any way apply to the body; and that, on the other hand, of the body which is altogether inapplicable to the soul; and that, again, of the whole man, which cannot be affirmed without absurdity either of the body or of the soul separately. Lastly, the properties of the soul are transferred to the body, and the properties of the body to the soul, and yet these form only one man, not more than one. Such modes of expression intimate both that there is in man one person formed of two compounds, and that these two different natures constitute one person. Thus the Scriptures speak of Christ. They sometimes attribute to him qualities which should be referred specially to his humanity and sometimes qualities applicable peculiarly to his divinity, and sometimes qualities which embrace both natures, and do not apply specially to either. This combination of a twofold nature in Christ they express so carefully, that they sometimes communicate them with each other, a figure of speech which the ancients termed ijdiwmavtwn koinoniva (a communication of properties).
2. Proof from passages of Scripture which distinguish between the two natures. Proof from the communication of properties
2. Little dependence could be placed on these statements, were it not proved by numerous passages throughout the sacred volume that none of them is of man’s devising. What Christ said of himself, “Before Abraham was I am,” (John 8:58), was very foreign to his humanity. I am not unaware of the cavil by which erroneous spirits distort this passage—viz. that he was before all ages, inasmuch as he was foreknown as the Redeemer, as well in the counsel of the Father as in the minds of believers. But seeing he plainly distinguishes the period of his manifestation from his eternal existence, and professedly founds on his ancient government, to prove his precedence to Abraham, he undoubtedly claims for himself the peculiar attributes of divinity. Paul’s assertion that he is “the first-born of every creature,” that “he is before all things, and by him all things consist,” (Col. 1:15, 17); his own declaration, that he had glory with the Father before the world was, and that he worketh together with the Father, are equally inapplicable to man. These and similar properties must be specially assigned to his divinity. Again, his being called the servant of the Father, his being said to grow in stature, and wisdom, and favour with God and man, not to seek his own glory, not to know the last day, not to speak of himself, not to do his own will, his being seen and handled,2 apply entirely to his humanity; since, as God, he cannot be in any respect said to grow, works always for himself, knows every thing, does all things after the counsel of his own will, and is incapable of being seen or handled. And yet he not merely ascribes these things separately to his human nature, but applies them to himself as suitable to his office of Mediator. There is a communication of ijdiwvmata, or properties, when Paul says, that God purchased the Church “with his own blood,” (Acts 20:28), and that the Jews crucified the Lord of glory (1 Cor. 2:8). In like manner, John says, that the Word of God was “handled.” God certainly has no blood, suffers not, cannot be touched with hands; but since that Christ, who was true God and true man, shed his blood on the cross for us, the acts which were performed in his human nature are transferred improperly, but not ceaselessly, to his divinity. We have a similar example in the passage where John says that God laid down his life for us (1 John 3:16). Here a property of his humanity is communicated with his other nature. On the other hand, when Christ, still living on the earth, said, “No man has ascended up to heaven but he that came down from heaven, even the Son of man, which is in heaven,” (John 3:13), certainly regarded as man in the flesh which he had put on, he was not then in heaven, but inasmuch as he was both God and man, he, on account of the union of a twofold nature, attributed to the one what properly belonged to the other.