In this post I will quote from a few fathers and saints of the Church whom all believed that the reason the Son honored the Father as his God is because of the Incarnation, as a result of the eternal Word becoming flesh and taking on a human nature.

Hippolytus

60. To grasp this divine mystery we must see the God in Him without ignoring the Man; and the Man without ignoring the God. We must not divide Jesus Christ, for the Word was made flesh: yet we must not call Him buried, though we know He raised Himself again: must not doubt His resurrection, though we dare not deny He was buried. Jesus Christ was buried, for He died: He died, and even cried out at the moment of death, My God, My God, why have You forsaken Me? Yet He, Who uttered these words, said also: Verily I say unto you, This day shall you be with Me in Paradise Luke 23:43, and He Who promised Paradise to the thief cried aloud, Father, into Your hands I commend My Spirit; and having said this He gave up the Ghost. (On the Trinity, Book X)

John Chrysostom

Ver. 3. Blessed be the God, he says, and Father of our Lord Jesus Christ.

Observe; The God of Him that was Incarnate. And though you will not, The Father of God the Word. (Homilies on Ephesians, Homily 1)

Athanasius

Chapter 26. Introductory to Texts from the Gospels on the Incarnation. Enumeration of texts still to be explained. Arians compared to the Jews. We must recur to the Regula Fidei. Our Lord did not come into, but became, man, and therefore had the acts and affections of the flesh. The same works divine and human. Thus the flesh was purified, and men were made immortal. Reference to I Peter 4:1.

26. For behold, as if not wearied in their words of irreligion, but hardened with Pharaoh, while they hear and see the Saviour’s human attributes in the Gospels , they have utterly forgotten, like the Samosatene, the Son’s paternal Godhead , and with arrogant and audacious tongue they say, ‘How can the Son be from the Father by nature, and be like Him in essence,’ who says, ‘All power is given unto Me;’ and ‘The Father judges no man, but has committed all judgment unto the Son.’ and ‘The Father loves the Son, and has given all things into His hand; he that believes in the Son has everlasting life;’ and again, ‘All things were delivered unto Me of My Father, and no one knows the Father save the Son, and he to whomsoever the Son will reveal Him;’ and again, ‘All that the Father has given unto Me, shall come to Me.’ On this they observe, ‘If He was, as you say, Son by nature, He had no need to receive, but He had by nature as a Son.’ Or how can He be the natural and true Power of the Father, who near upon the season of the passion says, ‘Now is My soul troubled, and what shall I say? Father, save Me from this hour; but for this came I unto this hour. Father, glorify Your Name. Then came there a voice from heaven, saying, I have both glorified it, and will glorify it again John 12:27-28.’ And He said the same another time; ‘Father, if it be possible, let this cup pass from Me;’ and ‘When Jesus had thus said, He was troubled in spirit and testified and said, Verily, verily, I say unto you, that one of you shall betray Me.’ Then these perverse men argue; ‘If He were Power, He had not feared, but rather He had supplied power to others.’ Further they say; ‘If He were by nature the true and own Wisdom of the Father,’ how is it written, ‘And Jesus increased in wisdom and stature, and in favour with God and man?’ In like manner, when He had come into the parts of Cæsarea Philippi, He asked the disciples whom men said that He was; and when He was at Bethany He asked where Lazarus lay; and He said besides to His disciples, ‘How many loaves have ye?’ How then,‘ say they, ‘is He Wisdom, who increased in wisdom and was ignorant of what He asked of others?’ This too they urge; How can He be the own Word of the Father, without whom the Father never was, through whom He makes all things, as you think, who said upon the Cross ‘My God, My God, why have You forsaken Me?’ and before that had prayed, ‘Glorify Your Name,’ and, ‘O Father, glorify Thou Me with the glory which I had with You before the world was.’ And He used to pray in the deserts and charge His disciples to pray lest they should enter into temptation; and, ‘The spirit indeed is willing,’ He said, ‘but the flesh is weak.’ And, ‘Of that day and that hour knows no man, no, nor the Angels, neither the Son.’ Upon this again say the miserable men, ‘If the Son were, according to your interpretation , eternally existent with God, He had not been ignorant of the Day, but had known as Word; nor had been forsaken as being coexistent; nor had asked to receive glory, as having it in the Father; nor would have prayed at all; for, being the Word, He had needed nothing; but since He is a creature and one of things originate, therefore He thus spoke, and needed what He had not; for it is proper to creatures to require and to need what they have not.’

27. This then is what the irreligious men allege in their discourses; and if they thus argue, they might consistently speak yet more daringly; ‘Why did the Word become flesh at all?’ and they might add; ‘For how could He, being God, become man?’ or, ‘How could the Immaterial bear a body?’ or they might speak with Caiaphas still more Judaically, ‘Wherefore at all did Christ, being a man, make Himself God ?’ for this and the like the Jews then muttered when they saw, and now the Ario-maniacs disbelieve when they read, and have fallen away into blasphemies. If then a man should carefully parallel the words of these and those, he will of a certainty find them both arriving at the same unbelief, and the daring of their irreligion equal, and their dispute with us a common one. For the Jews said; ‘How, being a man, can He be God?’ And the Arians, ‘If He were very God from God, how could He become man?’ And the Jews were offended then and mocked, saying, ‘Had He been Son of God, He had not endured the Cross;’ and the Arians standing over against them, urge upon us, ‘How dare ye say that He is the Word proper to the Father’s Essence, who had a body, so as to endure all this?’ Next, while the Jews sought to kill the Lord, because He said that God was His own Father and made Himself equal to Him, as working what the Father works, the Arians also, not only have learned to deny, both that He is equal to God and that God is the own and natural Father of the Word, but those who hold this they seek to kill. Again, whereas the Jews said, ‘Is not this the Son of Joseph, whose father and mother we know? How then is it that He says, Before Abraham was, I am, and I came down from heaven?’ The Arians on the other hand make response and say conformably, ‘How can He be Word or God who slept as man, and wept, and inquired?’ Thus both parties deny the Eternity and Godhead of the Word in consequence of those human attributes which the Saviour took on Him by reason of that flesh which He bore…

Chapter 29. Texts Explained; Twelfthly, Matthew 26:39; John 12:27, etc. Arian inferences are against the Regula Fidei, as before. He wept and the like, as man. Other texts prove Him God. God could not fear. He feared because His flesh feared.

54. Therefore as, when the flesh advanced, He is said to have advanced, because the body was His own, so also what is said at the season of His death, that He was troubled, that He wept, must be taken in the same sense. For they, going up and down , as if thereby recommending their heresy anew, allege; Behold, ‘He wept,’ and said, ‘Now is My soul troubled,’ and He besought that the cup might pass away; how then, if He so spoke, is He God, and Word of the Father? Yea, it is written that He wept, O God’s enemies, and that He said, ‘I am troubled,’ and on the Cross He said, ‘Eloi, Eloi, lama sabachthani,’ that is, ‘My God, My God, why have You forsaken Me?’ and He besought that the cup might pass away. Thus certainly it is written; but again I would ask you (for the same rejoinder must of necessity be made to each of your objections ), If the speaker is mere man, let him weep and fear death, as being man; but if He is the Word in flesh (for one must not be reluctant to repeat), whom had He to fear being God? Or wherefore should He fear death, who was Himself Life, and was rescuing others from death? Or how, whereas He said, ‘Fear not him that kills the body Luke 12:4,’ should He Himself fear? And how should He who said to Abraham, ‘Fear not, for I am with you,’ and encouraged Moses against Pharaoh, and said to the son of Nun, ‘Be strong, and of a good courage,’ Himself feel terror before Herod and Pilate? Further, He who succours others against fear (for ‘the Lord,’ says Scripture, ‘is on my side, I will not fear what man shall do unto me ‘), did He fear governors, mortal men? Did He who Himself had come against death, feel terror of death? Is it not both unseemly and irreligious to say that He was terrified at death or hades, whom the keepers of the gates of hades saw and shuddered? But if, as you would hold, the Word was in terror wherefore, when He spoke long before of the conspiracy of the Jews, did He not flee, nay said when actually sought, ‘I am He?’ for He could have avoided death, as He said, ‘I have power to lay down My life, and I have power to take it again;’ and ‘No one takes it from Me.’

55. But these affections were not proper to the nature of the Word, as far as He was Word; but in the flesh which was thus affected was the Word, O Christ’s enemies and unthankful Jews! For He said not all this prior to the flesh; but when the ‘Word became flesh,’ and has become man, then is it written that He said this, that is, humanly. Surely He of whom this is written was He who raised Lazarus from the dead, and made the water wine, and vouchsafed sight to the man born blind, and said, ‘I and My Father are one.’ If then they make His human attributes a ground for low thoughts concerning the Son of God, nay consider Him altogether man from the earth, and not from heaven, wherefore not from His divine works recognise the Word who is in the Father, and henceforward renounce their self-willed irreligion? For they are given to see, how He who did the works is the same as He who showed that His body was passible by His permitting it to weep and hunger, and to show other properties of a body. For while by means of such He made it known that, though God impassible, He had taken a passible flesh; yet from the works He showed Himself the Word of God, who had afterwards become man, saying, ‘Though you believe not Me, beholding Me clad in a human body, yet believe the works, that you may know that I am in the Father, and the Father in Me. ‘ And Christ’s enemies seem to me to show plain shamelessness and blasphemy; for, when they hear ‘I and the Father are one,’ they violently distort the sense, and separate the unity of the Father and the Son; but reading of His tears or sweat or sufferings, they do not advert to His body, but on account of these rank in the creation Him by whom the creation was made. What then is left for them to differ from the Jews in? For as the Jews blasphemously ascribed God’s works to Beelzebub, so also will these, ranking with the creatures the Lord who wrought those works, undergo the same condemnation as theirs without mercy. (Discourse III Against the Arians)

Gregory of Nazianzen

V. Take, in the next place, the subjection by which you subject the Son to the Father. What, you say, is He not now subject, or must He, if He is God, be subject to God? You are fashioning your argument as if it concerned some robber, or some hostile deity. But look at it in this manner: that as for my sake He was called a curse, Who destroyed my curse; and sin, who takes away the sin of the world; and became a new Adam to take the place of the old, just so He makes my disobedience His own as Head of the whole body. As long then as I am disobedient and rebellious, both by denial of God and by my passions, so long Christ also is called disobedient on my account. But when all things shall be subdued unto Him on the one hand by acknowledgment of Him, and on the other by a reformation, then He Himself also will have fulfilled His submission, bringing me whom He has saved to God. For this, according to my view, is the subjection of Christ; namely, the fulfilling of the Father’s Will. But as the Son subjects all to the Father, so does the Father to the Son; the One by His Work, the Other by His good pleasure, as we have already said. And thus He Who subjects presents to God that which he has subjected, making our condition His own. Of the same kind, it appears to me, is the expression, “My God, My God, why hast Thou forsaken Me?” It was not He who was forsaken either by the Father, or by His own Godhead, as some have thought, as if It were afraid of the Passion, and therefore withdrew Itself from Him in His Sufferings (for who compelled Him either to be born on earth at all, or to be lifted up on the Cross?) But as I said, He was in His own Person representing us. For we were the forsaken and despised before, but now by the Sufferings of Him Who could not suffer, we were taken up and saved. Similarly, He makes His own our folly and our transgressions; and says what follows in the Psalm, for it is very evident that the Twenty-first Psalm refers to Christ.

VI. The same consideration applies to another passage, “He learnt obedience by the things which He suffered,” and to His “strong crying and tears,” and His “Entreaties,” and His “being heard,” and His” Reverence,” all of which He wonderfully wrought out, like a drama whose plot was devised on our behalf. For in His character of the Word He was neither obedient nor disobedient. For such expressions belong to servants, and inferiors, and the one applies to the better sort of them, while the other belongs to those who deserve punishment. But, in the character of the Form of a Servant, He condescends to His fellow servants, nay, to His servants, and takes upon Him a strange form, bearing all me and mine in Himself, that in Himself He may exhaust the bad, as fire does wax, or as the sun does the mists of earth; and that I may partake of His nature by the blending. Thus He honours obedience by His action, and proves it experimentally by His Passion. For to possess the disposition is not enough, just as it would not be enough for us, unless we also proved it by our acts; for action is the proof of disposition.

And perhaps it would not be wrong to assume this also, that by the art of His love for man He gauges our obedience, and measures all by comparison with His own Sufferings, so that He may know our condition by His own, and how much is demanded of us, and how much we yield, taking into the account, along with our environment, our weakness also. For if the Light shining through the veil upon the darkness, that is upon this life, was persecuted by the other darkness (I mean, the Evil One and the Tempter), how much more will the darkness be persecuted, as being weaker than it? And what marvel is it, that though He entirely escaped, we have been, at any rate in part, overtaken? For it is a more wonderful thing that He should have been chased than that we should have been captured;-at least to the minds of all who reason aright on the subject. I will add yet another passage to those I have mentioned, because I think that it clearly tends to the same sense. I mean “In that He has suffered being tempted, He is able to succour them that are tempted.” But God will be all in all in the time of restitution; not in the sense that the Father alone will Be; and the Son be wholly resolved into Him, like a torch into a great pyre, from which it was reft away for a little space, and then put back (for I would not have even the Sabellians injured by such an expression); but the entire Godhead when we shall be no longer divided (as we now are by movements and passions), and containing nothing at all of God, or very little, but shall be entirely like.

VII. As your third point you count the Word Greater; and as your fourth, To My God and your God. And indeed, if He had been called greater, and the word equal had not occurred, this might perhaps have been a point in their favour. But if we find both words clearly used what will these gentlemen have to say? How will it strengthen their argument? How will they reconcile the irreconcilable? For that the same thing should be at once greater than and equal to the same thing is an impossibility; and the evident solution is that the Greater refers to origination, while the Equal belongs to the Nature; and this we acknowledge with much good will. But perhaps some one else will back up our attack on your argument, and assert, that That which is from such a Cause is not inferior to that which has no Cause; for it would share the glory of the Unoriginate, because it is from the Unoriginate. And there is, besides, the Generation, which is to all men a matter so marvellous and of such Majesty. For to say that he is greater than the Son considered as man, is true indeed, but is no great thing. For what marvel is it if God is greater than man? Surely that is enough to say in answer to their talk about Greater.

VIII. As to the other passages, My God would be used in respect, not of the Word, but of the Visible Word. For how could there be a God of Him Who is properly God? In the same way He is Father, not of the Visible, but of the Word; for our Lord was of two Natures; so that one expression is used properly, the other improperly in each of the two cases; but exactly the opposite way to their use in respect of us. For with respect to us God is properly our God, but not properly our Father. And this is the cause of the error of the Heretics, namely the joining of these two Names, which are interchanged because of the Union of the Natures. And an indication of this is found in the fact that wherever the Natures are distinguished in our thoughts from one another, the Names are also distinguished; as you hear in Paul’s words, “The God of our Lord Jesus Christ, the Father of Glory.” The God of Christ, but the Father of glory. For although these two terms express but one Person, yet this is not by a Unity of Nature, but by a Union of the two. What could be clearer? (Oration 30 Fourth Theological Oration)

Cyril of Alexandria

Therefore, to her honour and glory and perpetual renown, the Saviour vouchsafed unto Mary the duty of proclaiming to the brethren the tidings contained in His words: I ascend unto My Father and your Father, and My God and your God; and do thou for thy part accept this great and profound mystery, not suffering thine heart to vault over the measure of the truth of the Divine doctrines. Observe how the Only-begotten Word of God came among us, that we also might be even as He is, so far as is possible for our nature to attain thereto, and so far as relates unto our new creation by grace. For He humbled Himself that He might exalt that which was by nature lowly to His own high station; and wore the form of a servant, though He was by Nature Lord and Son of God, that He might uplift that which was by nature enslaved to the dignity of Sonship, in conformity with His own Likeness, and in His Image. How, and in what sense, then, He, becoming one of us as Man, in order that we also might be like Him, that is, Gods and Sons, receives our attributes into Himself, and gives back unto us His own, you may well be anxious to inquire. I will explain, then, as far as I am able: In the first place, then, though we are servants by rank and nature (for creatures are subject to their Creator), He calls us His brethren, and designates God the common Father of Himself and us; and, making humanity His own, by taking our likeness upon Him, He calls our God His God, though He is His Son by Nature; that, as we mount up to His exceeding great dignity of station by likeness to Him (for it is not because we are by nature sons of God that we are so called, for He cries in our hearts by His own Spirit, Abba, Father), so also He, since He took our form-—for He became Man, according to the Scriptures-—might have God for His God, though He was truly God by Nature, and proceeded from Him. Be not, therefore, offended, |664 though you hear Him calling God His God, but rather contemplate His words in a teachable spirit, and attentively consider their true meaning. For He says that God is both His Father and our God; and both sayings are true. For, in very truth, the God of the universe is Christ’s Father, but not ours by nature; but rather our God as our Creator and Sovereign Lord. But the Son, as it were, blending Himself with us, vouchsafes to our nature the dignity that is in a special and peculiar sense His own, calling Him That begat Him the common Father of us all; while, on the other hand, He receives into Himself, by taking upon Him our likeness, that which belonged to our nature. For He calls His Father His God, being unwilling, through His inherent love and mercy toward mankind, to dishonour our likeness that He had taken upon Himself. If, then, you choose in ignorance to cavil at this saying, and it seem intolerable to you that the Lord should say that God the Father was His God, you will then, in your perversity, be bringing a charge against the scheme for your own redemption; and when you ought to be offering up thanksgiving you will be dishonouring your Benefactor, and be foolishly objecting to the manner in which He manifested His love towards you. For if He humbled Himself, despising shame, and became a Man for your sake, on your head is the charge of humiliation, and to Him Who chose to undergo this for your sake, exceeding great is the honour due. And I am amazed that you have ears merely for the eclipse of glory (for He humbled Himself for our sake), and consider not its restoration, and, regarding only the degradation, reflect not upon the exaltation. For how was He humiliated, if you do not regard Him as perfect, as being God? And in what sense was He degraded, if you do not take into account the lofty attributes of His ineffable Nature? Therefore, when He was perfect and all-sufficient as God, He humbled Himself for your sake, transforming Himself to your likeness; and though He was high |665 exalted as the Son of God, and of the very Essence of the Father, He degraded Himself, being mulcted of the attributes of Divine glory, so far as His Nature admitted. As therefore, now, He is at the same time God and Man, being high exalted because of His parentage (for He is God of God and truly Begotten of His Father), and also made lowly for our sake (for He became Man for us); be of a tranquil mind when you hear Him saying: I ascend unto My Father and your Father, and My God and your God. For it was very meet and right that, as being by Nature God and Son of God, He should call Him That begat Him His Father; and that, as being Man, even as we are men. He should call God His God. (Cyril of Alexandria, Commentary on John, LFC 43, 48 (1874/1885). Book 12. Vol. 2 pp. 589-708. , CHAPTER I. That the Son is by Nature God, even though we find Him calling the Father His God. xx. 17. But go unto My brethren, and say to them, I ascend unto My Father and your Father, and My God and your God.)

Ambrose of Milan

Chapter 14. That the Son of God is not a created being is proved by the following arguments: (1) That He commanded not that the Gospel should be preached to Himself; (2) that a created being is given over unto vanity; (3) that the Son has created all things; (4) that we read of Him as begotten; and (5) that the difference of generation and adoption has always been understood in those places where both natures — the divine and the human — are declared to co-exist in Him. All of which testimony is confirmed by the Apostle’s interpretation.

86. It is now made plain, as I believe, your sacred Majesty, that the Lord Jesus is neither unlike the Father, nor one that began to exist in course of time. We have yet to confute another blasphemy, and to show that the Son of God is not a created being. Herein is the quickening word that we read as our help, for we have heard the passage read where the Lord says: Go into all the world, and preach the Gospel to all creation. Mark 16:15 He Who says all creation excepts nothing. How, then, do they stand who call Christ a creature? If He were a creature, could He have commanded that the Gospel should be preached to Himself? It is not, therefore, a creature, but the Creator, Who commits to His disciples the work of teaching created beings.

87. Christ, then, is no created being; for created beings are, as the Apostle has said, given over to vanity. Romans 8:20 Is Christ given over unto vanity? Again, creation— according to the same Apostle — groans and travails together even until now. What, then? Does Christ take any part in this groaning and travailing — He Who has set us miserable mourners free from death? Creation, says the Apostle, shall be set free from the slavery of corruption. Romans 8:21-22 We see, then, that between creation and its Lord there is a vast difference, for creation is enslaved, but the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom. 2 Corinthians 3:17

88. Who was it that led first into this error, of declaring Him Who created and made all things to be a creature? Did the Lord, I would ask, create Himself? We read that all things were made by Him, and without Him was nothing made. John 1:3 This being so, did He make Himself? We read — and who shall deny?— that in wisdom has God made all things. If so, how can we suppose that wisdom was made in itself?

89. We read that the Son is begotten, inasmuch as the Father says: I brought you forth from the womb before the morning star. We read of the first-born Son, Colossians 1:15 of the only-begotten John 1:14 — first-born, because there is none before Him; only-begotten, because there is none after Him. Again, we read: Who shall declare His generation? Isaiah 53:8 Generation, mark you, not creation. What argument can be brought to meet testimonies so great and mighty as these?

90. Moreover, God’s Son discovers the difference between generation and grace when He says: I go up to My Father and your Father, to My God and your God. He did not say, I go up to our Father, but I go up to My Father and your Father. This distinction is the sign of a difference, inasmuch as He Who is Christ’s Father is our Creator.

91. Furthermore He said, to My God and your God, because although He and the Father are One, and the Father is His Father by possession of the same nature, while God began to be our Father through the office of the Son, not by virtue of nature, but of grace— still He seems to point us here to the existence in Christ of both natures, Godhead and Manhood — Godhead of His Father, Manhood of His Mother, the former being before all things, the latter derived from the Virgin. For the first, speaking as the Son, He called God His Father, and afterward, SPEAKING AS MAN, NAMED HIM AS GOD.

92. Everywhere, indeed, we have witness in the Scriptures to show that Christ, in naming God as His God, DOES SO AS A MAN. My God, My God, why have You forsaken Me? And again: From My mother’s womb You are My God. In the former place He suffers as a man; in the latter it is a man who is brought forth from his mother’s womb. And so when He says, From My mother’s womb You are My God, He means that He Who was always His Father is His God FROM THE MOMENT WHEN HE WAS BROUGHT FORTH FROM HIS MOTHER’S WOMB.

93. Seeing, then, that we read in the Gospel, in the Apostle, in the Prophets, of Christ as begotten, how dare the Arians to say that He was created or made? But, indeed, they ought to have bethought them, where they have read of Him as created, where as made. For it has been plainly shown that the Son of God is begotten of God, born of God — let them, then, consider with care where they have read that He was made, seeing that He was not made God, but born as God, the Son of God; afterward, however, He was, according to the flesh, made man of Mary.

94. But when the fullness of time had come, God sent His Son, made of a woman, made under the Law.  His Son, observe, not as one of many, not as His in common with another, but His own, and in saying His Son, the Apostle showed that it is of the Son’s nature that His generation is eternal. Him the Apostle has affirmed to have been afterwards made of a woman, in order that the making might be understood not of the Godhead, but of the putting on of a body — made of a woman, then, by taking on of flesh; made under the Law through observance of the Law. Howbeit, the former, the spiritual generation is before the Law was, the latter is after the Law. (Exposition of the Christian Faith, Book I)