then now, O heretic, a sign given you from heaven; and not one only, but many and special ones? For there is one in the opening of heaven, another in the descent of the Spirit, a third in the voice of the Father. All of which most clearly show that Christ is God, for the laying open of the heavens indicates that He is God, and the descent of the Holy Spirit upon Him supports His Divinity, and the address of the Father confirms it. For heaven would not have been opened except in honour of its Lord: nor would the Holy Ghost have descended in a bodily form except upon the Son of God: nor would the Father have declared Him to be the Son, had he not been truly such; especially with such tokens of a Divine birth, as not merely to confirm the truth of the right faith, but also to exclude the wickedness of guilty and erroneous belief. For when the Father had expressly and pointedly said with the inexpressible majesty of a Divine utterance, “This is My Son,” He added also what follows—I mean, “My beloved, in whom I am well pleased.” As He had already declared Him by the prophet to be God the Mighty and God the Great, so when He says here, “My beloved Son in whom I am well pleased,” He adds further to the name of His own Son the title also of His beloved Son, in whom He is well pleased: that the addition of the titles might denote the special properties of the Divine nature; and that that might specially redound to the glory of the Son of God, which had never happened to any man. And so just as in the case of our Lord Jesus Christ these special and unique things happened; viz., that the heavens were opened, that in the sight of all God the Father touched Him in a sort of way, through the coming and presence of the dove, and pointed almost with His finger to Him saying, “This is My Son;” so this too is special and unique in His case; viz., that He is specially beloved, and is specially named as well-pleasing to the Father, in order that these special accompaniments might mark the special import of His nature, and that the special character of His names might support the special position of the only begotten Son, which the honour of the signs previously given had already confirmed. But here comes the end of this book. For this saying of God the Father can neither be added to, nor equalled by any words of men. For us God the Father Himself is a sufficiently satisfactory witness concerning our Lord Jesus Christ, when He says “This is My Son.” If you think that it is possible for these utterances of God the Father to be gainsaid, then you are forced to contradict Him, who by the clearest possible announcement caused Him to be acknowledged as His Son by the whole world.
Complete source paragraph · Against Nestorius, Chapter XVI.; original source section: Chapter 16; original book/conference: Book III., source paragraph 4 · Original source