Isaiah 45:5 — I am the LORD, and there is no other

“I am the LORD, and there is no other; besides me there is no God. I equip you, though you do not know me, that people may know, from the rising of the sun and from the west, that there is none besides me; I am the LORD, and there is no other.”

Isaiah 45:5–6

Context: Deutero-Isaiah and the monotheistic provocation

Isaiah 45 belongs to so-called “Deutero-Isaiah” (chs. 40–55), a complex which most probably came into being during or toward the end of the Babylonian exile (ca. 550–539 BC), immediately before the rise of the Persian king Cyrus II. Babylon — the cultural and religious stronghold of the ancient world — was the centre of a rich polytheistic pantheon: Marduk as the patron god of the city, Ishtar as queen of heaven, Nabu as the scribal god of wisdom. For the deported people of Israel the existential question was: has the God of Israel been defeated by the Babylonian gods, or is he the one real God, who even harnesses a pagan great king like Cyrus as the instrument of his history?

It is precisely this question that Isaiah 45 answers with relentless sharpness. Vv.1–4 portray Cyrus as YHWH's “anointed” (máshíach), who is unknowingly God's instrument: “I have called you by name, I have given you a title of honour, though you did not know me.” In v.5 the theological point sets in: this God, who can harness Cyrus without Cyrus knowing him, is not one among the gods, but the only God whatsoever. The monotheistic statement here has a quite concrete world-historical edge: history is not a struggle of competing gods, but the work of the one God of Israel.

The rhetorical structure of the chapter is highly deliberately composed. The uniqueness statement repeats sevenfold (v.5: “and there is no other”; v.6: “none besides me”; v.14: “and there is no other, no other God”; v.18: “and there is no other”; v.21: “a righteous God and a Saviour, there is none besides me”; v.22: “I am God, and there is no other”; v.24: “in the LORD alone”). In the Hebrew Bible the sevenfold repetition is taken as the expression of the highest intensification — cf. the sevenfold structuring of the creation narrative in Genesis 1. What Isaiah 45 says, it says with the greatest possible rhetorical emphasis that the Hebrew language system knows.

Socinian reception history: Fausto Sozzini and his successors in the 16th and 17th centuries used the uniqueness statements of Deutero-Isaiah as the Old Testament backbone of their critique of the Trinity. The Racovian Catechism (1605) builds its doctrine of the one God on a chain of Scripture passages that take Isaiah 44:6; 45:5; 46:9 together with Deuteronomy 6:4; Mark 12:29; 1 Corinthians 8:6; Ephesians 4:6 and John 17:3 as locus classicus: the one God of Scripture is numerically one, a single person, and this person is, according to NT usage, expressly the Father of Jesus Christ.

Johann Crell (1590–1633), arguably the greatest systematician of the Polish Brethren, devotes in De Uno Deo Patre (1631) a chapter of its own to the exegesis of Isa 45. His main argument: when God says in v.5 “efes — there is utterly nothing besides me,” then this excludes not only the idols of the heathen, but every one who would stand in numerical divinity alongside the speaker of this sentence. The trinitarian attempt to set a second person of the same numerical essence beside the speaker abandons the linguistic space within which Isa 45 itself formulates.

The Socinian core thesis

Socinianly, Isaiah 45:5 is not an abstract monotheistic confession but a linguistically precise self-statement of God about the structure of his personhood. Three observations carry the thesis:

First: The speaker speaks consistently in the first person singular — not in the pluralis maiestatis and not in a triadic we-speech. Aní YHWH we-'ên 'ôd — “I (am) YHWH and there is none besides.” Whoever says “I” here identifies himself grammatically as one speaking person — not as three persons who through a common essence would together say “I.” Trinitarian doctrine demands that the reader read “I” trinitarianly; the text itself does not yield this reading.

Second: The exclusion particles efes (“there is utterly nothing,” v.5b: zûláti 'efes 'Elohim) and 'ên 'ôd (“there is none besides”) are the strongest exclusion formulas that Biblical Hebrew knows. Efes denotes in the OT the utterly null (cf. Isa 40:17: “All the nations are as nothing before him; he counts them as efes and emptiness”). When God says “besides me efes Elohim,” he radically removes the status “God” from every other candidate — not only from Marduk and Ishtar, but from every numerical competitor.

Third: The sevenfold repetition in ch. 45 shifts the statement out of the realm of occasional polemic into the realm of theological fundamental statement. What is said sevenfold is not incidental rhetoric, but foundational law. The OT here formulates its image of God in its sharpest version — and precisely this image of God is not withdrawn in the NT but confirmed: Mark 12:29 (Jesus quotes the Shema); 1 Corinthians 8:6 (“for us there is one God, the Father”); Ephesians 4:6 (“one God and Father of all”); John 17:3 (“you, the only true God”); 1 Timothy 2:5 (“one God and one mediator”).

Sozzini and the Polish Brethren draw the consequence: whoever divides the one God trinitarianly into three persons overstrains the biblical linguistic space. The Father of Christ is not one of three personae in a common esse, but that one God of whom Isa 45:5 speaks. Christ is the sent, exalted and only mediator of this God — not a second subsistence of the same numerical essence.

Key terms

Five terms and expressions decide the exegesis of Isaiah 45:5 linguistically and philologically:

aní YHWH — “I am YHWH”

The formula aní YHWH (“I am YHWH”) is the central self-introductory formula of God in the OT. It appears more than 160 times, more than 50 of those in Ezekiel alone as the “recognition formula”: wída'tem ki aní YHWH — “and you will know that I am YHWH” (cf. Ex 6:7; 7:5; 14:4; Ezek passim). The formula establishes the subject of the self-statement: it is YHWH, the proper name of God — not a triadic subject subsisting in three persons.

Here lies the first hermeneutical basic decision: who is the speaker of the OT speeches of God? Socinianly the answer is clear: the one who according to NT witness reveals himself as “the Father.” John 8:54: “My Father glorifies me, of whom you say, He is our God.” Jesus identifies the God of Israel as the Father — not as himself, not as a triadic being. The presupposition that the OT YHWH-speaker is to be read in a trinitarian way is a dogmatic reading that the text itself does not demand.

we-'ên 'ôd — “and there is none besides”

The expression 'ên 'ôd is an exclusive denial of existence: not merely “there is no other” (in the sense of “none different”), but “there is utterly none besides” (in the sense of “none additional”). The particle 'ôd means “still, further, besides” and is the strongest Hebrew form of excluding additionality.

Theologically decisive: 'ên 'ôd also excludes the possibility of a second person of the same essence. Whoever would come numerically “in addition” to the speaker — even as “consubstantial” — would be an 'ôd. The Hebrew text knows no distinction between ontological and personal additionality; every additionality is excluded according to Isa 45:5.

zûláti 'efes 'Elohim — “besides me: no God at all”

The second half of v.5 sharpens the first: zûláti (“besides me,” “apart from me”) plus 'efes 'Elohim (“no God at all”). The particle 'efes denotes in the OT the radically null — cf. Isa 40:17 (“All the nations are efes”); Isa 41:12 (your enemies become efes); Isa 41:29 (the images of the idols are efes); Isa 52:4 (“without cause, efes”).

In the Hellenistic linguistic space of the LXX, efes is regularly rendered with ouk éstin (“it is not”) or ou plên (“none besides”). The Septuagint of Isa 45:5 translates: ouk éstin theos plên emoú — “there is no God besides me.” This formulation is taken up in 1 Corinthians 8:4 by Paul: oudeis theós ei mê heis — “there is no God but one” — and in v.6 identified: this one God is the Father. The line Isa 45 → LXX → 1 Cor 8 is linguistically consistently monad-monotheistic.

'ázar — “equipped” / “girded”

In v.5 it reads: a'azzerká — “I equip/gird you” (Cyrus). The verb 'ázar denotes “girding” with power, “equipping” with strength. Theologically important: God equips a pagan great king for his task “though he does not know him” (v.4). Cyrus becomes an instrument of history without himself being God.

This structural pattern — God appoints a chosen one who is not God, but executes God's commission — is Socinianly central for Christology. As Cyrus is “equipped” by God without being God, so Christ is “appointed” by God as Messiah (Acts 2:36: God has made him Lord and Christ), without being that one God. The logic of OT commissioning stands opposed to a trinitarian Christology of essence.

Sevenfold repetition — rhetorical intensification as confession

In ch. 45 the uniqueness statement repeats seven times: v.5 (twice: “and there is no other” / “no God besides me”); v.6 (“none besides me”); v.14 (“and there is no other, no other God”); v.18 (“and there is no other”); v.21 (“no righteous God and Saviour besides me”); v.22 (“I am God, and there is no other”).

In Biblical Hebrew the number seven is the number of completion (cf. Gen 1; the sevenfold temple-dedication trumpets in Josh 6; the sevenfold sprinkling language in Lev 16). A sevenfold repetition of the uniqueness statement within a single chapter is not stylistic redundancy but theological maximum: what is said sevenfold is confession in the strictest sense. Whoever relativises this confession by a trinitarian reading overstrains the rhetorical structure of the text itself.

Sozzini in the original: the Racovian Catechism on Isaiah 45 and the uniqueness of God

The Racovian Catechism (1605) uses the uniqueness statements of Isaiah throughout as the scriptural foundation of its central doctrine of the one God. The argument is made explicit in the section “Against the error of three persons in God's essence.” Three passages are here decisive:

“Prove that in the one essence of God there is only a single person. — This can certainly already be seen from this alone, that the essence of God is one, not in kind but in number. Therefore there can in no way be in him several persons differing in number, since it is one and the same indivisible thinking essence. Consequently, if one counts three persons, in the same way one would also have to count three individual essences, so that, as one says it is one essence in number, in the same way one must also say it is one person in number.”

Racovian Catechism, on the one God the Father

The Catechism operates here with the scholastic distinction between “in kind” (specie) and “in number” (numero). Two human beings are “in kind” one — they share the genus humanity — but “in number” two. Trinitarian doctrine wants to call God “one in number” and at the same time count three persons. Precisely this counting operation, the Racovian Catechism says, is logically impossible: whoever counts three persons thereby counts three numerically different subjects — and that is tritheism, not monotheism.

Precisely here Isaiah 45:5 becomes the supporting scriptural proof: if the speaker of the self-introduction “I am YHWH, and there is no other” is in number one, then there can be no second subject which in the same numerical sense would be “God.” The Polish Brethren draw the consequence that this one speaker is to be identified with the Father of Christ:

“Who is this one divine person? — The Father of our Lord Jesus Christ. By what do you prove this? — By the clearest testimonies of Scripture, which run thus: ‘This is eternal life’ (says Jesus, John 17:3), ‘that they may know you, Father, the only true God.’ And to the Corinthians the apostle writes: ‘For us there is one God, the Father, from whom are all things’ (1 Cor. 8:6). And to the Ephesians: ‘One God and Father of all, who is over all and through all and in all’ (Eph. 4:6).”

Racovian Catechism, on the one God the Father

The line is clear: Isaiah 45:5 says “I am the LORD, and there is no other”; the NT identifies this one, beside whom there is no other, as “the Father.” Whoever counts Christ or the Spirit as further persons of this one God goes beyond what both OT and NT allow. Christ himself prays to this one God (John 17:3), distinguishes himself from him, and calls him “the only true God” — a linguistically precise difference.

The Catechism further adds the important distinction between the strict and the derivative usage of the word “God”:

“The word ‘Deus’ is used in the Scriptures chiefly in two ways: The first way occurs when it denotes him who rules and governs over all things in heaven and on earth in such a way that he acknowledges no one above himself, who is the author and origin of all things, so that he depends on no one, and who possesses an absolutely infinite power. In this meaning Scripture maintains that God is one. The second way occurs when it denotes those who possess some power, … and who thus in a certain way share in the divinity of that one God. … In this very second meaning the Son of God is in some places of Scripture called God.”

Racovian Catechism, double use of the word “God”

With this philological distinction the passages are resolved at which the NT calls Christ “God” (e.g. John 1:1; John 20:28; Heb 1:8). In the strict, absolute sense God is only one — that is the meaning in which Isa 45:5 says “and there is no other.” In the derivative sense, persons authorised by God can also be called “God” (cf. John 10:34–36: “If he called those gods to whom the word of God came…”; Ps 82:6). Christ is called “God” in this second, derivative sense — not in the strict sense in which Isa 45 states the uniqueness.

The Catechism further draws the soteriological-ethical consequence from the confession of the one God:

“That opinion [the trinitarian doctrine] can, first, easily shake and undermine faith in the one God, namely, in that it now confesses one God, now proclaims three persons, each of whom is said to be God; indeed, it shakes it in so far as it denies that that God who is called the one is a person. Second, it obscures the glory of the one God, who alone is the Father of Christ, in that it transfers it to another who is not the Father.”

Racovian Catechism, on the consequences of the three-person error

The concern of the Polish Brethren is not abstract-philosophical but highly concrete: the trinitarian doctrine “obscures the glory of the one God” because it transfers the worship and honour, which Isaiah 45 expressly assigns to the one Father alone, to another. In the OT linguistic sense that is the very definition of idolatry — and the point of Isaiah's polemic against the idols of Babylon (Isa 44:9–20; 46:1–7) is exactly this: the glory of the one God is shifted onto something else.

Book overview of the writings of Sozzini and the Polish Brethren

Logical arguments

From Isaiah 45:5 the following linguistic and theological arguments against a trinitarian reading of God's uniqueness follow:

1. Argument from the first person singular. The speaker in Isa 45:5 speaks consistently in the first person singular: aní — “I.” A triadic “we-speech” would have been possible in Hebrew (cf. the disputed plural na'asé in Gen 1:26, “let us make humankind”), but precisely is not used here. Whoever says “I” here identifies himself as one speaking person.
2. Argument from the exclusion particle efes. Efes denotes the radically null (cf. Isa 40:17; 41:29; 52:4). When God says “besides me efes Elohim,” he radically removes the status “God” from every other candidate — including a second or third person of the same essence. The particle admits no numerical differentiation.
3. Argument from the sevenfold repetition. In ch. 45 the uniqueness statement is repeated seven times (vv.5.6.14.18.21.22). In Biblical Hebrew the number seven is the number of completion. A sevenfold repetition is rhetorical maximum — what is said sevenfold is confession in the strictest sense. Whoever “extends” this confession trinitarianly overstrains the rhetorical structure of the text.
4. Argument from the NT identification. 1 Cor 8:6; Eph 4:6; John 17:3; 1 Tim 2:5: throughout the NT identifies the one God of the OT with “the Father” — not with a triadic being in which Father, Son and Spirit would share equally. Whoever wishes to read Isa 45:5 trinitarianly must ignore this NT line of identification.
5. Argument from countability (Racovian Catechism). If the essence of God is “one in number,” then the persons posited in this essence must likewise be counted “in number.” Three persons count three subjects — that is tritheism, not monotheism. Isa 45:5 with 'ên 'ôd excludes every numerical additionality.
6. Argument from the OT logic of commissioning. Cyrus is in Isa 45:1–4 “equipped” by God without being God. This structural pattern of OT commissioning — God appoints a chosen one without this chosen one being numerically included in God — is, Socinianly, the model for Christology: Christ is the appointed Messiah, not a second subsistence.
7. Argument from the LXX translation. The Septuagint translates Isa 45:5 with ouk éstin theos plên emoú — “there is no God besides me.” Exactly this formula is taken up in 1 Cor 8:4 by Paul: oudeis theós ei mê heis. The linguistic line Isa 45 LXX → 1 Cor 8 is consistently monad-monotheistic.
8. Argument from the exclusivity of worship. Isa 45:23 — “To me every knee shall bow” — combines uniqueness and exclusivity of worship: to the one God alone bowing of knees is due. When Phil 2:10–11 applies these words to Christ, this is not an identification of Christ with that one God, but expressly a transfer of honour to the exalted one “to the glory of God the Father” (v.11) — the goal of the knee-bowing returns to the one God of Isa 45.
9. Argument from the double use (Racovian Catechism). The word “God” is used in Scripture in two ways: strict-absolute (only the Father) and derivative-functional (also for authorised persons such as Moses, judges, angels and Christ; cf. Ps 82:6; John 10:34–36). Isa 45:5 speaks in the strict sense — and in the strict sense God is only one.
10. Argument from hermeneutical priority. The sevenfold, expressly exclusive statement of Isa 45 has hermeneutical priority over ambiguous NT passages such as John 1:1 or John 20:28. The clear interprets the obscure. Whoever reinterprets the most precise OT confession through NT ambiguities goes hermeneutically in the wrong direction.

Objections and Socinian responses

Objection 1: “Isaiah speaks against pagan idols, not against intra-trinitarian persons.”

Objection: The statement “no other God” in Isa 45 is directed against the Babylonian idols Marduk, Ishtar and Nabu, not against the question whether the Son or the Spirit could be “God” in a derivative sense. Trinitarian doctrine speaks anyway of a different kind of divinity than the idols against which Isaiah preaches.

Response: The objection is linguistically precise and theologically nevertheless untenable. Linguistically: efes and 'ên 'ôd are not polemic-relative but absolute exclusion formulas. They exclude not only the polytheistic competitors, but every one who would stand numerically alongside the speaker of this sentence. Theologically: whoever sets a second person of the same essence alongside the speaker of Isa 45:5 undoes the rhetorical point of the text. The scholastic distinction of a “different kind of divinity” (consubstantiality + personal distinction) is a later dogmatic construction which has no foothold whatever in the linguistic space of the OT. The Racovian Catechism rejects this objection with the observation that the essence of God is one “not in kind but in number” — which excludes numerical countability of other persons. Whoever circumvents this imports post-Christian concepts into a text that was written half a millennium before those concepts.

Objection 2: “The NT reveals an extension of the understanding of God.”

Objection: The OT does not yet have a full understanding of the Trinity. The NT reveals that the one God exists in three persons. Isaiah speaks of the unity of essence, not of the uniqueness of person. Only Christian revelation makes the inner differentiation of God clear.

Response: This thesis (salvation-historical “self-revelation of God”) has a peculiar problem: the NT quotes Isa 45 and the other uniqueness statements of the OT consistently in a strictly monad-monotheistic sense, never in an “extended” trinitarian sense. Jesus himself quotes the Shema (Mk 12:29) without trinitarian extension. Paul identifies in 1 Cor 8:4–6 the one God of the OT expressly as “the Father” and sets Christ alongside him as “one Lord” — with a prepositional separation of ex hou (Father as origin) and di' hou (Christ as mediator). Had the NT wished to make a binitarian or trinitarian reading of Isa 45, it could have done so. It does not. The Racovian Catechism expresses this as follows: the NT identification of the one God as “Father” is the express confirmation of the OT uniqueness statements, not their extension. The “self-revelation extension” is a later dogmatic reading that the NT itself does not make.

Objection 3: “Isaiah 45:23 is applied to Christ in Phil 2:10–11 — this proves his divinity.”

Objection: In Isa 45:23 God says: “To me every knee shall bow.” Paul applies this text in Phil 2:10–11 expressly to Christ: at the name of Jesus every knee bows. If the worship which Isa 45:23 reserves to the one God falls in Phil 2 to the exalted Christ, then Christ is to be identified with that one God of Isa 45.

Response: The application of Isa 45:23 in Phil 2:10–11 is, Socinianly, not an identification of Christ with the one God, but an express transfer of honour to the one exalted by God. The key words are in v.9: di` ho kaí ho theós autón hyperhýpsôsen kaí echarísato autôi to ónoma to hyper pân ónoma — “Therefore God has highly exalted him and bestowed on him the name that is above every name.” Christ receives the honour as a gift of God after the exaltation; he did not eternally have it in himself. Whoever receives, did not have before. And the goal of the knee-bowing (v.11): eis dóxan theoú patrós — “to the glory of God the Father.” Worship of Christ does not lead away from the Father, but back to him. That is exactly the structure that Isa 45 triggers: to the one God honour is due — and the one God installs his Messiah as the person through whom this honour returns to him. The trinitarian reading must ignore v.11 in order to use Phil 2 as proof of the Trinity.

Objection 4: “When the NT calls Christ ‘God’ (John 1:1; John 20:28; Rom 9:5; Titus 2:13; 2 Pet 1:1), then he is to be identified with the one God of Isa 45.”

Objection: If Scripture calls Christ “God” — and it does so expressly in several places —, then the same Scripture must be consistent in itself. Christ is therefore either the one God of Isa 45 (trinitarianly) or a second God beside the one (bitheism). Socinianly only bitheism remains, which is self-contradictory.

Response: This alternative (trinitarianism or bitheism) is false because it ignores the double use of the word “God,” which the Racovian Catechism treats in detail. In the strict, absolute sense “God” is only the Father — that is the meaning of Isa 45:5. In the derivative, functional sense, authorised persons can also be called “God” — as Moses is to be “God” before Pharaoh (Ex 7:1), as the judges of Israel are called “gods” (Ps 82:6), as angels in Zech 3:2 figure as elohim. Jesus himself defends his “God”-predication in John 10:34–36 expressly with reference to Ps 82: “If he called those gods to whom the word of God came, do you say of him whom God has sanctified and sent into the world, ‘You are blaspheming,’ because I said, I am the Son of God?” That is an express application of the second, derivative usage to himself. Socinianly there is no bitheism, because in the strict sense “God” is exclusively the Father. Christ is “God” in the second sense — as the Messiah sanctified and sent by the one God.

Objection 5: “The plural Elohim and the ‘we-speeches’ in the OT prove an inner plurality of God.”

Objection: The noun Elohim is grammatically plural. The “we-speeches” in Gen 1:26 (“let us make humankind”), Gen 3:22, Gen 11:7 and Isa 6:8 (“Who will go for us?”) show that God is plural in himself. This supports the trinitarian reading also of Isa 45.

Response: Linguistically the thesis is overstrained. First: Elohim is indeed grammatically plural, but is consistently construed with singular verbs (bara' Elohim Gen 1:1 — “God created,” singular). It is a pluralis maiestatis or pluralis intensitatis, not a numerical plural. Second: the “we-speeches” are throughout in modern exegesis understood as address to the heavenly court (Gen 1:26 to the bnê ha-elohim — “sons of God”; Isa 6:8 to the seraphim). That fits the theophany language of the OT. Third, and most important: the same Scripture which knows Elohim and “we-speeches” says in Isa 45 sevenfold “I am the LORD, and there is no other” in the first person singular. Whoever upgrades the few “we-speeches” to proofs of the Trinity and plays down the sevenfold singular self-introduction in Isa 45 reverses the hermeneutical burden of proof. The clear interprets the obscure — not the other way around. The singular self-introduction of God is the hermeneutical anchor; the plural forms are to be interpreted in the light of this anchor.

Cross-references

Theological consequences

Summary

Isaiah 45:5 is the sharpest uniqueness statement of the OT — formulated in the first person singular, furnished with the strongest Hebrew exclusion particle efes, repeated sevenfold within the same chapter. Linguistically the text leaves no room for a second or third numerical person of the same divine essence. Whoever fails to see this overstrains the rhetorical and grammatical structure of the text.

Socinianly Isa 45:5 becomes the OT foundation of the central doctrine of the Racovian Catechism: the essence of God is “in number” one, and consequently contains only one person. This one person is, according to NT witness (1 Cor 8:6; Eph 4:6; John 17:3; 1 Tim 2:5), expressly the Father of Jesus Christ. Christ is the Messiah and mediator installed by this one God — not a second subsistence, but the only envoy of the one God.

The application of Isa 45:23 in Phil 2:10–11 is not identification but transfer: God exalts Christ and gives him a name “to the glory of God the Father.” The circle of worship returns to the one God of Isa 45. The NT passages at which Christ is called “God” are, according to the distinction of the Racovian Catechism, to be understood in the second, derivative sense (cf. John 10:34–36 with Ps 82:6) — not in the strict sense in which Isa 45 states the uniqueness. Whoever takes Isaiah 45 seriously cannot let the one God subsist in three persons.