What kind of union, then, between God and man has been effected? Is it as when two bodies are laid the one against the other, so that they are only joined locally, and no touch of the quality of the one reaches the other--the kind of union which the Greeks term [Greek: kata parathesin] "by juxtaposition"? But if humanity has been united to divinity in this way no one thing has been formed out of the two, and hence Christ is nothing. The very name of Christ, indeed, denotes by its singular number a unity. But if the two persons continued and such a union of natures as we have above described took place, there could be no unity formed from two things, for nothing could ever possibly be formed out of two persons. Therefore Christ is, according to Nestorius, in no respect one, and therefore He is absolutely nothing. For what is not one cannot exist either; because Being and unity are convertible terms, and whatever is one is. Even things which are made up of many items, such as a heap or chorus, are nevertheless a unity. Now we openly and honestly confess that Christ is; therefore we say that Christ is a Unity. And if this is so, then without controversy the Person of Christ is one also. For if the Persons were two He could not be one; but to say that there are two Christs is nothing else than the madness of a distraught brain. Could Nestorius, I ask, dare to call the one man and the one God in Christ two Christs? Or why does he call Him Christ who is God, if he is also going to call Him Christ who is man, when his combination gives the two no common factor, no coherence? Why does he wrongly use the same name for two utterly different natures, when, if he is compelled to define Christ, he cannot, as he himself admits, apply the substance of one definition to both his Christs? For if the substance of God is different from that of man, and the one name of Christ applies to both, and the combination of different substances is not believed to have formed one Person, the name of Christ is equivocal[66] and cannot be comprised in one definition. But in what Scriptures is the name of Christ ever made double? Or what new thing has been wrought by the coming of the Saviour? For the truth of the faith and the unwontedness of the miracle alike remain, for Catholics, unshaken. For how great and unprecedented a thing it is--unique and incapable of repetition in any other age--that the nature of Him who is God alone should come together with human nature which was entirely different from God to form from different natures by conjunction a single Person! But now, if we follow Nestorius, what happens that is new? "Humanity and divinity," quoth he, "keep their proper Persons." Well, when had not divinity and humanity each its proper Person? And when, we answer, will this not be so? Or wherein is the birth of Jesus more significant than that of any other child, if,