"God is not man, that he should lie, or a son of man, that he should change his mind. Has he said, and will he not do it? Or has he spoken, and will he not fulfill it?"
— Numbers 23:19
Quick Answer
God's character, promises, and purposes never change (Numbers 23:19, Malachi 3:6), but Scripture describes him relenting from judgment in relational response to human repentance (Jonah 3:10) or intercession (Exodus 32:14). These are not changes in his nature but consistent expressions of his unchanging mercy and justice toward changing human circumstances.
A Tension Right There in Scripture
Open your Bible and you will find both kinds of statements: verses declaring God never changes his mind, and verses describing God relenting, or repenting, of a judgment he had announced. This is not a contradiction hidden in obscure corners of Scripture; both kinds of texts sit openly alongside each other, sometimes within the same book.
Resolving this tension well matters, because it shapes how you understand prayer, repentance, and whether your choices genuinely interact with a sovereign, unchanging God.
Verses Where God Relents
Several passages describe God changing course. When Israel worshiped the golden calf, God told Moses he intended to destroy the nation, but after Moses interceded, “the LORD relented from the disaster that he had spoken of bringing on his people” (Exodus 32:14). When Jonah finally preached to Nineveh and the city repented, “God relented of the disaster that he had said he would do to them, and he did not do it” (Jonah 3:10).
Genesis 6:6 even says God was sorry he had made humanity, using the same Hebrew root often translated relent or repent elsewhere. These are real, meaningful statements, not incidental language to be explained away.
Verses Where God Never Changes
Set alongside these are equally clear statements of God's absolute unchangeableness. Numbers 23:19 declares, “God is not man, that he should lie, or a son of man, that he should change his mind. Has he said, and will he not do it? Or has he spoken, and will he not fulfill it?” Malachi 3:6 grounds Israel's ongoing existence in this very truth: “For I the LORD do not change; therefore you, O children of Jacob, are not consumed.”
James 1:17 describes God as the Father of lights “with whom there is no variation or shadow due to change.” This attribute, called immutability, means God's essential character, purposes, and promises are eternally fixed, never improving, degrading, or shifting.
How Both Can Be True: Consistent Character, Different Responses
The key to holding these together is recognizing that the relenting passages describe a change in God's relational stance toward changing human circumstances, not a change in his unchanging character. God's fixed character includes a consistent commitment: mercy toward the repentant, judgment toward the persistently rebellious, a general pattern of how God deals with nations spelled out explicitly in Jeremiah 18:7-10.
When Nineveh repented, God's unchanging commitment to show mercy to the repentant meant his response to Nineveh changed, precisely because his character did not. If God had destroyed Nineveh after their genuine repentance, that would have been the real inconsistency.
Nineveh: A Case Study in Divine Relenting
Jonah's story shows this principle perfectly. God's message through Jonah was a warning, not an unconditional decree: “Yet forty days, and Nineveh shall be overthrown!” (Jonah 3:4). Built into the very nature of prophetic warnings was the implicit reality that repentance could change the outcome, exactly what Jeremiah 18:7-10 explains as the general pattern for how God relates to nations under threat of judgment.
Jonah himself understood this dynamic and resented it, admitting he fled to Tarshish in the first place because he knew God was gracious and relenting from disaster (Jonah 4:2). God's relenting was not a surprise change of plan; it was the entirely predictable, consistent outworking of his merciful character in response to genuine repentance.
What This Means for Your Prayers
This truth gives real weight to prayer and repentance without threatening God's sovereignty. When you pray, you are not trying to manipulate an unpredictable deity into a better mood; you are engaging, by his own design, with a God whose unchanging mercy responds meaningfully to genuine repentance and faith-filled intercession, as Moses's prayer for Israel and Nineveh's repentance both illustrate.
You can trust both truths at once: God's promises and character will never shift beneath your feet, and your prayers and repentance genuinely matter to how his unchanging faithfulness plays out in your life.
Hezekiah's Prayer: Another Case of Relenting
A second clear example of this pattern appears in the life of King Hezekiah. When the prophet Isaiah announced that Hezekiah would die of his illness, Hezekiah wept and prayed earnestly, reminding God of his faithful walk (2 Kings 20:1-3). Before Isaiah had even left the palace courtyard, God sent him back with a different message: fifteen years would be added to Hezekiah's life (2 Kings 20:4-6).
This account shows the same principle at work as Nineveh's repentance: God's revealed word through the prophet expressed a real, immediate trajectory, while his hidden, ultimate purposes accounted for and responded to Hezekiah's prayer. God was not caught off guard by Hezekiah's request, nor did his character shift; rather, his unchanging commitment to hear the prayers of his people (Psalm 34:15) meant that the sincere prayer of a righteous king became the means by which God's greater purpose unfolded.
These accounts should encourage believers to pray boldly rather than fatalistically. Because God is unchangingly gracious toward those who call on him, prayer is never wasted breath directed at an indifferent, fixed decree; it is a genuine means God has ordained for his unchanging purposes to be accomplished.