Isaiah 43:11 and Isaiah 45:5-6 are very similar passages:
“I, even I, am the Lord, And besides Me there is no savior.” Isa 43:11 NKJV
“I am the Lord, and there is no other; There is no God besides Me. I will gird you, though you have not known Me, That they may know from the rising of the sun to its setting That there is none besides Me. I am the Lord, and there is no other;” Isa 45:5-6 NKJV
In these passages, obviously, God speaks in an exclusive way, proclaiming Himself the only true God. In light of the New Testament’s teaching that there is a Trinity of divine persons of the Father, Son, and Holy Spirit, some might wonder who the person speaking in these verses is. The most natural reading is that it is the Father, if for no other reason than that it is the ordinary pattern of scripture that when “God” is spoken of absolutely without qualification, it is referring to the one who scripture calls the “one God”, the person of the Father. We could give many examples of this throughout the New Testament, such as John 3:16, 18, and 2 Corinthians 13:14:
“For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life. 17 For God did not send His Son into the world to condemn the world, but that the world through Him might be saved. 18 “He who believes in Him is not condemned; but he who does not believe is condemned already, because he has not believed in the name of the only begotten Son of God.” John 3:16-18 NKJV
“The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Spirit be with you all. Amen.” 2 Cor 13:14 NKJV
But sometimes the Son is also called “God”, so if a person is still unsure who is being spoken of, they may still wonder which person of the Trinity is in view. It is only natural, from the scriptures and reason, to think that one person is spoken of here, and utterly unnatural and foreign to scripture to think that a plurality of persons would speak as though they were one. So which person is it?
Greater clarity can be provided by employing one of the most natural, fundamental, and basic rules of scriptural interpretation: that we interpret scripture by scripture, understanding the unclear with the help of the clear. It is clear, in the fullness of revelation in the new Testament, that the “one God” 1 Cor 8:6 and “only true God” John 17:3 is the person of the Father in particular. Since this is explicitly taught, we can interpret scripture by scripture; if the scriptures throughout the New Testament reserve those titles for the person of the Father alone, we may safely understand that in the old testament, the same titles refer to the same person. This is the natural way to read these passages.
Yet, some insist that it must refer to the entire Trinity, a reading of the text that is entirely unnatural. The grammar of the text gives no indication of a plurality of persons, but rather, a single person is clearly indicated by the use of singular personal pronouns. But for dogmatic reasons, some wish to insert the entire Trinity, as if a single person, into the text of scripture here. This is all that those who want to teach that the Trinity is a single person can do; since no where in scripture is their absurd error ever taught, they must mutilate the scriptures to their own ends, and pretend they speak of a person unspoken of in scripture, their “God the Trinity”, that person who they suppose is all three persons of the Trinity.
And yet, as we have shown, the scriptural reading of these verses is to refer them to the person of the Father. This view, being the natural reading, is also, as should be expected, the way that we see the early church fathers of the ante-nicene and nicene eras apply these texts of scripture, as can be seen from the extensive quotations below:
Hilary of Poitiers
“XXIII. If any man, after the example of the Jews, understand as said for the destruction of the Eternal Only-begotten God, the words, I am the first God, and I am the last God, and beside Me there is no God Isaiah 44:6, which were spoken for the destruction of idols and them that are no gods: let him be anathema.
57. Though we condemn a plurality of gods and declare that God is only one, we cannot deny that the Son of God is God. Nay, the true character of His nature causes the name that is denied to a plurality to be the privilege of His essence. The words, Beside Me there is no God, cannot rob the Son of His divinity: because beside Him who is of God there is no other God. And these words of God the Father cannot annul the divinity of Him who was born of Himself with an essence in no way different from His own nature. The Jews interpret this passage as proving the bare unity of God, because they are ignorant of the Only-begotten God. But we, while we deny that there are two Gods, abhor the idea of a diversity of natural essence in the Father and the Son. The words, Beside Me there is no God, take away an impious belief in false gods. In confessing that God is One, and also saying that the Son is God, our use of the same name affirms that there is no difference of substance between the two Persons.” (Hilary of Poitiers, De Synodis)
Novatian of Rome
“And now, indeed, concerning the Father, and the Son, and the Holy Spirit, let it be sufficient to have briefly said thus much, and to have laid down these points concisely, without carrying them out in a lengthened argument. For they could be presented more diffusely and continued in a more expanded disputation, since the whole of the Old and New Testaments might be adduced in testimony that thus the true faith stands. But because heretics, ever struggling against the truth, are accustomed to prolong the controversy of pure tradition and Catholic faith, being offended against Christ; because He is, moreover, asserted to be God by the Scriptures also, and this is believed to be so by us; we must rightly — that every heretical calumny may be removed from our faith— contend, concerning the fact that Christ is God also, in such a way as that it may not militate against the truth of Scripture; nor yet against our faith, how there is declared to be one God by the Scriptures, and how it is held and believed by us. For as well they who say that Jesus Christ Himself is God the Father, as moreover they who would have Him to be only man, have gathered thence the sources and reasons of their error and perversity; because when they perceived that it was written that
God is one, they thought that they could not otherwise hold such an opinion than by supposing that it must be believed either that Christ was man only, or really God the Father. And they were accustomed in such a way to connect their sophistries as to endeavour to justify their own error. And thus they who say that Jesus Christ is the Father argue as follows:— If God is one, and Christ is God, Christ is the Father, since God is one. If Christ be not the Father, because Christ is God the Son, there appear to be two Gods introduced, contrary to the Scriptures. And they who contend that Christ is man only, conclude on the other hand thus:— If the Father is one, and the Son another, but the Father is God and Christ is God, then there is not one God, but two Gods are at once introduced, the Father and the Son; and if God is one, by consequence Christ must be a man, so that rightly the Father may be one God. Thus indeed the Lord is, as it were, crucified between two thieves, even as He was formerly placed; and thus from either side He receives the sacrilegious reproaches of such heretics as these. But neither the Holy Scriptures nor we suggest to them the reasons of their perdition and blindness, if they either will not, or cannot, see what is evidently written in the midst of the divine documents. For we both know, and read, and believe, and maintain that God is one, who made the heaven as well as the earth, since we neither know any other, nor shall we at any time know such, seeing that there is none.
I, says He,
am God, and there is none beside me, righteous and a Saviour. And in another place:
I am the first and the last, and beside me there is no God who is as I. And, Who has meted out heaven with a Span, and the earth with a handful? Who has suspended the mountains in a balance, and the woods on scales? And Hezekiah:
That all may know that You are God alone. Moreover, the Lord Himself:
Why do you ask me concerning that which is good? God alone is good. Moreover, the Apostle Paul says:
Who only has immortality, and dwells in the light that no man can approach unto, whom no man has seen, nor can see. And in another place:
But a mediator is not a mediator of one, but God is one. But even as we hold, and read, and believe this, thus we ought to pass over no portion of the heavenly Scriptures, since indeed also we ought by no means to reject those marks of Christ’s divinity which are laid down in the Scriptures, that we may not, by corrupting the authority of the Scriptures, be held to have corrupted the integrity of our holy faith. And let us therefore believe this, since it is most faithful that Jesus Christ the Son of God is our Lord and God; because
in the beginning was the Word, and the Word was with God, and God was the Word. The same was in the beginning with God. And,
The Word was made flesh, and dwelt in us. And,
My Lord and my God. And,
Whose are the fathers, and of whom according to the flesh Christ came, who is over all, God blessed for evermore.” (Novatian of Rome, On the Trinity, Chapter 30)
We see here Novatian refers the verse in question to the person of the Father, continuing afterwards to speak of the Son distinctly.
“Him, then, we acknowledge and know to be God, the Creator of all things — Lord on account of His power, Parent on account of His discipline — Him, I say, who spoke, and all things were made; He commanded, and all things went forth: of whom it is written,
You have made all things in wisdom; of whom Moses said,
God in heaven above, and in the earth beneath; Deuteronomy 4:39 who, according to Isaiah,
has meted out the heaven with a span, the earth with the hollow of His hand;
who looks on the earth, and makes it tremble; who bounds the circle of the earth, and those that dwell in it like locusts; who has weighed the mountains in a balance, and the groves in scales, that is, by the sure test of divine arrangement; easily fall into ruins if it were not balanced with equal weights, He has poised this burden of the earthly mass with equity. Who says by the prophet,
I am God, and there is none beside me Isaiah 45:22 Who says by the same prophet
Because I will not give my majesty to another, Isaiah 13:8 that He may exclude all heathens and heretics with their figments; proving that that is not God who is made by the hand of the workman, nor that which is feigned by the intellect of a heretic. For he is not God for whose existence the workman must be asked. And He has added hereto by the prophet,
The heaven is my throne, and the earth is my footstool: what house will you build me, and where is the place of my rest? that He may show that He whom the world does not contain is much less contained in a temple; and He says these things not for boastfulness of Himself, but for our knowledge. For He does not desire from us the glory of His magnitude; but He wishes to confer upon us, even as a father, a religious wisdom. And He, wishing moreover to attract to gentleness our minds, brutish, and swelling, and stubborn with cloddish ferocity, says,
And upon whom shall my Spirit rest, save upon him that is lowly, and quiet, and that trembles at my words? Isaiah 66:2 — so that in some degree one may recognise how great God is, in learning to fear Him by the Spirit given to him: Who, similarly wishing still more to come into our knowledge, and, by way of stirring up our minds to His worship, said,
I am the Lord, who made the light and created the darkness; that we might deem not that some Nature, — what I know not — was the artificer of those vicissitudes whereby nights and days are controlled, but might rather, as is more true, recognise God as their Creator. And since by the gaze of our eyes we cannot see Him, we rightly learn of Him from the greatness, and the power, and the majesty of His works.
For the invisible things of Him, says the Apostle Paul, from the creation of the world, are clearly seen, being understood by those things which are made, even His eternal power and godhead; so that the human mind, learning hidden things from those that are manifest, from the greatness of the works which it should behold, might with the eyes of the mind consider the greatness of the Architect. Of whom the same apostle,
Now unto the King eternal, immortal, invisible, the only God, be honour and glory. 1 Timothy 1:17 For He has gone beyond the contemplation of the eyes who has surpassed the greatness of thought.
For, it is said, of Him, and through Him, and in Him are all things. Romans 11:33 For all things are by His command, because they are of Him; and are ordered by His word as being through Him; and all things return to His judgment; as in Him expecting liberty when corruption shall be done away, they appear to be recalled to Him.
Moreover, He is Good, Always the Same, Immutable, One and Only, Infinite; And His Own Name Can Never Be Declared, and He is Incorruptible and Immortal.
Him alone the Lord rightly declares good, of whose goodness the whole world is witness; which world He would not have ordained if He had not been good. For if
everything was very good, Genesis 1:31consequently, and reasonably, both those things which were ordained have proved that He that ordained them is good, and those things which are the work of a good Ordainer cannot be other than good; wherefore every evil is a departure from God. ” (Novatian of Rome, On the Trinity, Chapters 3-4)
Here we see again Novatian applies the verse to the Father, the only true God, speaking of the same person who that verse speaks of as the one Whom the Lord said was alone good- the Father.
Ignatius of Antioch
“There is then one God and Father, and not two or three; One who is; and there is no other besides Him, the only true [God]. For “the Lord thy God,” saith [the Scripture], “is one Lord.” And again, “Hath not one God created us? Have we not all one Father? And there is also one Son, God the Word. For “the only-begotten Son,” saith [the Scripture], “who is in the bosom of the Father.” And again, “One Lord Jesus Christ.” And in another place, “What is His name, or what His Son’s name, that we may know?” And there is also one Paraclete. For “there is also,” saith [the Scripture], “one Spirit,” since “we have been called in one hope of our calling.” And again, “We have drunk of one Spirit,”” (Letter to the Philippians)
Here we see Ignatius apply the verse in question to the Father, going on afterwards to speak of the Son and Spirit.
“For God cannot be called by any proper name, for names are given to mark out and distinguish their subject-matters, because these are many and diverse; but neither did any one exist before God who could give Him a name, nor did He Himself think it right to name Himself, seeing that He is one and unique, as He Himself also by His own prophets testifies, when He says, “I God am the first,” and after this, “And beside me there is no other God.”” (On the Monarchy of God, Chapter 21)
It is manifest that he speaks of the Father in particular here, who he frequently styles “the unbegotten God”, as he describes the one to whom he refers the passage as having none before who might give Him a name- yet this is not true of all three persons, but of the Father in particular, as He is unbegotten and of none; yet the Son, being from the Father by eternal generation, was given by His Father “that name which is above all names”.
Irenaeus of Lyons
“1. God, therefore, is one and the same, who rolls up the heaven as a book, and renews
the face of the earth; who made the things of time for man, so that coming to maturity in
them, he may produce the fruit of immortality; and who, through His kindness, also bestows [upon him] eternal things, “that in the ages to come He may show the exceeding riches of His grace;”1195 who was announced by the law and the prophets, whom Christ confessed as His Father. Now He is the Creator, and He it is who is God over all, as Esaias says, “I am witness, saith the Lord God, and my servant whom I have chosen, that ye may know, and believe, and understand that I am. Before me there was no other God, neither shall be after me. I am God, and besides me there is no Saviour. I have proclaimed, and I have saved.”1196 And again: “I myself am the first God, and I am above things to come.”1197 For neither in an ambiguous, nor arrogant, nor boastful manner, does He say these things; but since it was impossible, without God, to come to a knowledge of God, He teaches men, through His Word, to know God. To those, therefore, who are ignorant of these matters, and on this account imagine that they have discovered another Father, justly does one say, “Ye do err, not knowing the Scriptures, nor the power of God.”” (Irenaeus Chapter 5)
Here again we see Irenaeus take the natural meaning of the text, applying it to the Father, who teaches men about Himself through His Word, the Son.
“And he who worships and honours the Son, in the Son worships and honours the Father; for one is the Godhead; and therefore one the honour and one the worship which is paid to the Father in and through the Son. And he who thus worships, worships one God; for there is one God and none other than He. Accordingly when the Father is called the only God, and we read that there is one God, and ‘I am,’ and ‘beside Me there is no God,’ and ‘I the first and I the last,’ this has a fit meaning. For God is One and Only and First; but this is not said to the denial of the Son, perish the thought; for He is in that One, and First and Only, as being of that One and Only and First the Only Word and Wisdom and Radiance. And He too is the First, as the Fulness of the Godhead of the First and Only, being whole and full God. This then is not said on His account, but to deny that there is other such as the Father and His Word.”
“And this account of the meaning of such passages is satisfactory; for since those who are devoted to gods falsely so called, revolt from the True God, therefore God, being good and careful for mankind, recalling the wanderers, says, ‘I am Only God,’ and ‘I Am,’ and ‘Besides Me there is no God,’ and the like; that He may condemn things which are not, and may convert all men to Himself. And as, supposing in the daytime when the sun was shining, a man were rudely to paint a piece of wood, which had not even the appearance of light, and call that image the cause of light, and if the sun with regard to it were to say, ‘I alone am the light of the day, and there is no other light of the day but I,’ he would say this, with regard, not to his own radiance, but to the error arising from the wooden image and the dissimilitude of that vain representation; so it is with ‘I am,’ and ‘I am Only God,’ and ‘There is none other besides Me,’ viz. that He may make men renounce falsely called gods, and that they may recognise Him the true God instead. Indeed when God said this, He said it through His own Word, unless forsooth the modern2853 Jews add this too, that He has not said this through His Word; but so hath He spoken, though they rave, these followers of the devil. For the Word of the Lord came to the Prophet, and this was what was heard; nor is there a thing which God says or does, but He says and does it in the Word. Not then with reference to Him is this said, O Christ’s enemies, but to things foreign to Him and not from2855 Him. For according to the aforesaid illustration, if the sun had spoken those words, he would have been setting right the error and have so spoken, not as having his radiance without him, but in the radiance shewing his own light. Therefore not for the denial of the Son, nor with reference to Him, are such passages, but to the overthrow of falsehood.”
In both these passages it is clear Athanasius refers these words to the Father, saying in the latter that He spoke them through His Son.
“And if he should say, “See, see that I am, and there is no God beside me,” again it was the Father claiming this through the Son as through an image and mediator. For if, then, Isaiah the prophet says, “Sons I have reared and brought up,” and again, “Israel does not know me, and my people do not understand me,” and again, “I have commanded the stars, and by my hand I made firm the heavens,” and everything else of this sort, we will not say that Isaiah said these things, but that God was speaking through him and in him [the prophet]? Will it, then, not be fitting also with regard to the only-begotten Son of God [to say] that the Father needed to confirm these things through him for those who stood in need of these sorts of commandments? These men were idolaters, as the same scripture teaches, saying, “And the Lord said, ‘Where are [their] gods, in whom they trusted, of whose sacrifices you eat the fat and of whose libations you drink the wine? Let them arise and help you, and let them become your protectors.” For to these remarks was added the statement “See, see that I am, and there is no God beside me.”
Well now, if pronouncing countless times through the prophet he proclaimed, “Beside me there is no God,” and, “A righteous God and a savior, there is none beside me,” and, “You shall know no other god besides me, and besides me there is no savior,” and all the other remarks akin to these that are referenced in the other prophets, God was also on that basis “in Christ reconciling the world to himself,” and it was the Father himself who was saying these things to human beings through the only-begotten Son as through an interpreter.
And indeed, the Son himself handed down in the gospels, teaching [the people] to acknowledge only one God, when he said, “And this is eternal life, that they know you, the only true God, and Jesus Christ, whom you have sent.” Therefore, he himself was the true God, who alone is one and besides whom there is no other, who enjoined these things upon the Jewish nation when they had fallen into idolatry, not only through the prophets, but [also] through His own Son.”” (On Ecclesiastical Theology, Book 2, Chapters 21-22)
We may notice that there is no indication given whatsoever in any of these quotes that the fathers understood these passages to refer to a person other than the Father, and the Father alone; not to the exclusion of the Son and Spirit from the divine nature, as they explain, but rather to the exclusion of idols and false gods. Rather, they regarded these as words of the Father spoken in reference to His own person, through His Son, Who is His Word.
They do not refer these words to the Trinity conceived of as a person; but rather, these passages refute the blasphemy of “God the Trinity” altogether, since they rule out the possibility that there is any other person higher than or equal to God the Father; which certainly “God the Trinity” must be, since God the Father is but the third part of Him, according to the ravings of the semi-modalists.
Quote from Eusebius taken from: Eusebius Pamphilius, On Ecclesiastical Theology, trans. Kelly McCarthy Sproerl and Markus Vinzent (Washington, D.C.: The Catholic University of America Press, 2017).