24. Since the Word is from God, He must be Son. Since the Son is from everlasting, He must be the Word; else either He is superior to the Word, or the Word is the Father. Texts of the New Testamentwhich state the unity of the Son with the Father; therefore the Son is the Word. Three hypotheses refuted— 1. That the Man is the Son; 2. That the Word and Man together are the Son; 3. That the Word became Son on His incarnation. Texts of the Old Testamentwhich speak of the Son. If they are merely prophetical, then those concerning the Word may be such also
15 Such absurdities will be the consequence of saying that the Monad is dilated into a Triad. But since those who say so venture to separate Word and Son, and to say that the Word is one and the Son another, and that first was the Word and then the Son, come let us consider this doctrine also. Now their presumption takes various forms; for some say that the man whom the Saviour assumed is the Son; and others both that the man and the Word then became Son, when they were united. And others say that the Word Himself then became Son when He became man; for from being Word, they say, He has become Son, not being Son before, but only Word. Now both are Stoic doctrines, whether to say that God was dilated or to deny the Son, but especially is it absurd to name the Word, yet deny Him to be Son. For if the Word be not from God, reasonably might they deny Him to be Son; but if He is from God, how see they not that what exists from anything is son of him from whom it is? Next, if God is Father of the Word, why is not the Word Son of His own Father? For one is and is called father, whose is the son; and one is and is called son of another, whose is the father. If then God is not Father of Christ, neither is the Word Son; but if God be Father, then reasonably also the Word is Son. But if afterwards there is Father, and first God, this is an Arian thought. Next, it is absurd that God should change; for that belongs to bodies; but if they argue that in the instance of creation He became afterwards a Maker, let them know that the change is in the things which afterwards came to be, and not in God.
16. If then the Son too were a work, well might God begin to be a Father towards Him as others; but if the Son is not a work, then ever was the Father and ever the Son. But if the Son was ever, He must be the Word; for if the Word be not Son, and this is what a man waxes bold to say, either he holds that Word to be Father or the Son superior to the Word. For the Son being 'in the bosom of the Father,' of necessity either the Word is not before the Son (for nothing is before Him who is in the Father), or if the Word be other than the Son, the Word must be the Father in whom is the Son. But if the Word is not Father but Word, the Word must be external to the Father, since it is the Son who is 'in the bosom of the Father.' For not both the Word and the Son are in the bosom, but one must be, and He the Son, who is Only-begotten. And it follows for another reason, if the Word is one, and the Son another, that the Son is superior to the Word; for 'no one knows the Father save the Son,' not the Word. Either then the Word does not know, or if He knows, it is not true that 'no one knows.' And the same of 'He that has seen Me, has seen the Father,' and 'I and the Father are One,' for this is uttered by the Son, not the Word, as they would have it, as is plain from the Gospel; for according to John when the Lord said, 'I and the Father are One,' the Jews took up stones to stone Him. 'Jesus answered them, Many good works have I showed you from My Father, for which of those works do ye stone Me? The Jews answered Him, saying, For a good work we stone You not, but for blasphemy, and because that Thou, being a man, makest Yourself God. Jesus answered them, Is it not written in your law, I said, You are gods? If he called them gods unto whom the Word of God came, and the Scripture cannot be broken, say ye of Him, whom the Father has sanctified and sent into the world, Thou blaspheme, because I said, I am the Son of God? If I do not the works of My Father, believe Me not. But if I do, though ye believe not Me, believe the works, that you may know and believe that the Father is in Me, and I in the Father.' And yet, as far as the surface of the words intimated, He said neither 'I am God,' nor 'I am Son of God,' but 'I and the Father are One.'
17. The Jews then, when they heard 'One,' thought like Sabellius that He said that He was the Father, but our Saviour shows their sin by this argument: 'Though I had said “God,” you should have remembered what is written, “I said, You are gods;”' then to clear up 'I and the Father are One,' He has explained the Son's oneness with the Father in the words, 'Because I said, I am the Son of God.' For if He did not say it in words, still He has referred the sense of 'are One' to the Son. For nothing is one with the Father, but what is from Him. What is that which is from Him but the Son? And therefore He adds, 'that you may know that I am in the Father, and the Father in Me.' For, when expounding the 'One,' He said that the union and the inseparability lay, not in This being That, with which It was One, but in His being in the Father and the Father in the Son. For thus He overthrows both Sabellius, in saying, 'I am' not, “the Father,” but, 'the Son of God;' and Arius, in saying, 'are One.' If then the Son and the Word are not the same, it is not that the Word is one with the Father, but the Son; nor he that has seen the Word 'has seen the Father,' but 'he that has seen' the Son. And from this it follows, either that the Son is greater than the Word, or the Word has nothing beyond the Son. For what can be greater or more perfect than 'One,' and 'I in the Father and the Father in Me,' and 'He that has seen Me, has seen the Father.' for these utterances also belong to the Son. And hence the same John says, 'He that has seen Me, has seen Him that sent Me,' and, 'He that receives Me, receives Him that sent Me;' and, 'I have come a light into the world, that whosoever believes in Me, should not abide in darkness. And, if any one hear My words and observe them not, I judge him not; for I came not to judge the world, but to save the world. The word which he shall hear, the same shall judge him in the last day, because I go unto the Father. ' The preaching, He says, judges him who has not observed the commandment; 'for if,' He says, 'I had not come and spoken unto them, they had not had sin; but now they shall have no cloke,' He says, having heard My words, through which those who observe them shall reap salvation.
Source: Four Discourses Against the Arians (New Advent)