Immutability of God

They shall perish, but thou shalt endure: yea, all of them shall wax old like a garment; as a vesture shalt thou change them, and they shall be changed: but thou art the same, and thy years shall have no end.

— Psalm 102:26-27

The immutability of God is the teaching that God does not change, whether in his being, his perfections, his purposes, or his promises. Immutability follows from God’s self-existence: because God depends on nothing outside himself for his being, nothing outside himself can act on him to alter it. If God were not immutable, he would not be God at all, since a being capable of losing or gaining perfection could not have been the most perfect being to begin with.¹²

Confessional Witness

The 1689 Second London Baptist Confession lists immutability among a series of attributes describing God’s essence: he is “immutable, immense, eternal, incomprehensible, almighty, every way infinite, most holy, most wise, most free, most absolute; working all things according to the counsel of his own immutable and most righteous will for his own glory.”³ The Savoy Declaration states the identical clause almost word for word, naming God “immutable, immense, eternal, incomprehensible, almighty.”⁴ Immutability is Reformed teaching generally, not a distinctive of the Baptist confession.

Biblical Basis

God names his own immutability directly: “For I the Lord do not change” (Mal. 3:6), and Balaam declares to Balak, “God is not man, that he should lie, or a son of man, that he should change his mind” (Num. 23:19). The psalmist contrasts the perishing heavens and earth with God’s own endurance: “They will perish, but you will remain… you are the same, and your years have no end” (Ps. 102:26-27), a passage the author of Hebrews applies directly to Christ (Heb. 1:11-12). James calls God “the Father of lights, with whom there is no variation or shadow due to change” (James 1:17), and the author of Hebrews grounds the believer’s hope in “the unchangeable character of his purpose,” confirmed by God’s own oath, “so that by two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement” (Heb. 6:17-18).

Historical Development

The Puritan argument from the divine name

Puritan theologian Stephen Charnock’s discourse on Psalm 102:26-27 grounds immutability in the name God gave Moses at the burning bush: “I am that I am” (Exod. 3:14).⁵ “I am,” Charnock writes, “signifies his eternity; that, or the same that I am, his immutability: as it respects the essence of God, it signifies his unchangeable being from eternity to eternity.”⁵ A changeable thing cannot truly be said “to be,” since it “is not always the same,” but of God alone can it be said simply “I am,” without “was” or “will be.”⁵

Charnock also argues from the nature of perfection itself: any change in God would have to be either toward greater perfection or toward less. If toward greater perfection, “he was not before the most excellent Being,” and so was never truly God; if toward less perfection, he would cease to be the best Being and so cease to be God. “So that the sovereign perfection of God is an invincible bar to any change in him.”²

Reformed scholastic grounding in the divine simplicity

Seventeenth-century Reformed scholastics tied immutability to the whole cluster of attributes belonging to God alone. Francis Turretin argued that God’s simplicity “demands immutability because God is purus actus and cannot be compounded with anything”; his infinity means nothing can be added to or taken from him; his eternity excludes any “before” or “after” in his being; and his self-existence as Jehovah means nothing outside God can act on him to change him.⁶ On the will specifically, Turretin distinguished changing the will from willing a change: “It is one thing to change the will; another to will the change of anything.” God does not change his will when he wills, from eternity, that circumstances themselves should change, such as the passing of the Levitical priesthood under the new covenant.⁷ Petrus van Mastricht made the same argument for why the incarnation does not introduce change into God: the Word’s assumption of human nature was “not by the conversion of the Word into flesh, but by the assumption of the flesh to the hypostasis of the Word,” a new relation rather than an alteration of the divine essence.⁸

Opposing Views

Process theology, Jürgen Moltmann’s “dynamic panentheism,” and open theism each depart from the classical doctrine by making God capable of real change. Craig Carter describes the shared claim: on these views, “God changes his mind from time to time, gets angry, and does not know the future.”⁹ Open theism in particular denies that God exhaustively knows the future in order to preserve a genuinely responsive relationship between God and his creatures, a relationship its proponents hold classical immutability cannot allow.

Objections and Responses

Scripture repeatedly says God “repents” or changes his mind (Gen. 6:6; 1 Sam. 15:11; Jonah 3:10), which seems flatly to contradict immutability. Bavinck states the difficulty as strongly as any critic would before answering it: God “comes and goes, reveals and conceals himself… God even repents.”¹⁰ Charnock’s answer comes in three parts. First, repentance in the strict sense, a change of mind accompanied by grief, cannot belong to a being whose blessedness cannot be interrupted: “God is of one mind, and who can turn him? what his soul desires that he doth” (Job 23:13).¹¹ Second, such language is an accommodation to human weakness, the way Scripture ascribes bodily parts to God without meaning he has a body: “God therefore frames his language to our dulness… as nurses talk broken language to young children.”¹² Third, positively, “repentance in God is only a change of his outward conduct, according to his infallible foresight and immutable will. He changes the way of his providential proceeding according to the carriage of the creature, without changing his will.”¹³ When God is said to repent of making man in Genesis 6:6, this is “a change of events, not of counsels,” since God, “foreseeing man would fall, and decreeing to permit it, he could not be said to repent in time of what he did not repent from eternity.”¹³ Bavinck answers the same objection differently, not by explaining away the language but by denying that unchanging being and genuine relation are opposites: “the unchanging God is a living God who is related to his creatures in manifold ways and participates in their lives… [he] can enter into an infinite number of relations to his creatures,” the way the sun does not change whether it warms or scorches, or a pillar remains the same object whether seen from the left or the right.¹⁴

God announced through Jonah that Nineveh would be destroyed in forty days, yet the city was spared: didn’t God’s declared purpose change? Charnock treats this as one instance of a general rule for how prophetic threats function. Such predictions declare “what would follow by natural causes, or by the demerit of man, not what he would absolutely himself do,” and every threat carries an implied condition, just as every promise carries an implied condition of perseverance.¹⁵ He quotes Jeremiah’s own statement of this principle as a rule for reading all such cases: “At what instant I shall speak concerning a nation… to pluck up, and to pull down, and destroy it; if that nation… turn from their evil, I will repent of the evil that I thought to do unto them” (Jer. 18:7-10).¹⁵ Nineveh’s repentance triggered the very outcome the threat’s own unstated condition anticipated, so nothing in God changed when the city was spared.

Related Doctrines

References

Herman Bavinck, Reformed Dogmatics: Abridged in One Volume, ed. John Bolt (Grand Rapids: Baker Academic, 2011), chap. 8, “The Living, Acting God”: “Immutability is a natural implication of God’s aseity. While everything changes, God is and remains the same. If God were not immutable, he would not be God.” ↩
Stephen Charnock, The Existence and Attributes of God, ed. William Symington, 2 vols. (New York: Robert Carter & Brothers, 1853), vol. 1, Discourse VI, “On the Immutability of God,” 330-31: “if he changes to acquire a perfection he had not, then he was not before the most excellent Being… So that the sovereign perfection of God is an invincible bar to any change in him.” ↩ ↩²
The Second London Baptist Confession of Faith (1677), chap. 2, “Of God, and of the Holy Trinity,” para. 1. ↩
The Savoy Declaration (1658), chap. 2, “Of God, and of the Holy Trinity,” para. 1. ↩
Charnock, Discourse VI, 330: “The name Jehovah signifies this attribute (Exod. iii. 14): ‘I am that I am’… I am, signifies his eternity; that, or the same that I am, his immutability.” ↩ ↩² ↩³
Francis Turretin, Institutio Theologiae Elencticae 3.11.6 (ed. James T. Dennison Jr., trans. George Musgrave Giger, 1:205), quoted in Alex Charles Tibbott, “Turretin and Classical Theism,” in “De Impassibilitate Et Satisfactione: An Examination of the Methodological Implications of Trinitarian Classical Theism for the Doctrine of the Atonement” (PhD diss., The Southern Baptist Theological Seminary, 2024), 143-44. ↩
Turretin, IET 3.11.7 (Dennison, 1:205), quoted in Tibbott, “Turretin and Classical Theism,” 143. ↩
Turretin, IET 3.11.6 (Dennison, 1:205), quoted in Tibbott, “Turretin and Classical Theism,” 143. Tibbott notes Petrus van Mastricht makes the identical argument in his Theoretical-Practical Theology, vol. 2 (Grand Rapids: Reformation Heritage Books, 2019), 158-59. ↩
Craig A. Carter, Contemplating God with the Great Tradition: Recovering Trinitarian Classical Theism (Grand Rapids: Baker Academic, 2021), chap. 14, “Do We Worship the God of the Bible?”: “Everywhere we look we see novelty and startling departures from the classical tradition, such as the process theology widespread in liberal Protestantism, the dynamic panentheism of Moltmann, and the open theism of Pinnock and Sanders.” ↩
Bavinck, chap. 8: “As Creator of heaven and earth he comes and goes, reveals and conceals himself, averting his face (in wrath) and turning it back in grace. God even repents (Gen. 6:6; 1 Sam. 15:11; Amos 7:3, 6; Joel 2:13; Jon. 3:9; 4:2).” ↩
Charnock, Discourse VI, 341-42: “His blessedness would be impaired and interrupted while he is repenting… ‘God is of one mind, and who can turn him? what his soul desires that he doth’ (Job xxiii. 13).” ↩
Charnock, Discourse VI, 341-42: “God hath no more of a proper repentance, than he hath of a real body… God therefore frames his language to our dulness, not to his own state… as nurses talk broken language to young children.” ↩
Charnock, Discourse VI, 342: “repentance in God is only a change of his outward conduct, according to his infallible foresight and immutable will… for God, foreseeing man would fall, and decreeing to permit it, he could not be said to repent in time of what he did not repent from eternity.” ↩ ↩²
Bavinck, chap. 8: “the unchanging God is a living God who is related to his creatures in manifold ways and participates in their lives… while absolutely maintaining his immutability, he can enter into an infinite number of relations to his creatures.” ↩
Charnock, Discourse VI, 343: “God declared what would follow by natural causes, or by the demerit of man, not what he would absolutely himself do… the promises of God are to be understood, with the condition of perseverance in well doing; and threatenings, with a clause of revocation annexed to them, provided that men repent.” ↩ ↩²