"Moreover, man, for whom he was to pray, and the devil, whom he was to vanquish, have both put on a false likeness to God by their own will. Wherefore they have sinned, as it were, especially against the person of the Son, who is believed to be the very image of God. Wherefore the punishment or pardon of guilt is with peculiar propriety ascribed to him upon whom chiefly the injury was inflicted. Since, therefore, infallible reason has brought us to this necessary conclusion, that the Divine and human natures must unite in one person, and that this is evidently more fitting in respect to the person of the Word than the other persons, we determine that God the Word must unite with man in one person."
St. Anselm of Canterbury, Cur Deus Homo