God is not changeable or unreliable
The Bible is clear that God is not fickle. He does not discover new facts, make mistakes, or break a promise because someone has argued well enough. Balaam says God is not like a human who lies or needs to reverse himself, and the Lord declares that he does not change (Numbers 23:19; Malachi 3:6).
That gives prayer a solid foundation. You are not trying to manage God’s mood or persuade a distant ruler to care. You are coming to the God whose character is always faithful, holy, merciful, and wise.
God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good?
Yet God really responds
At the same time, Scripture does not treat prayer as empty words. When Israel made the golden calf, Moses pleaded for the people. The account says that the Lord relented from the disaster he had spoken of bringing on them (Exodus 32:10-11; Exodus 32:14). Moses’ prayer was part of the story, not an irrelevant detail.
Jonah saw something similar in Nineveh. God warned the city of judgement, but its people turned from their violence. God did not bring the announced disaster upon them (Jonah 3:10). These moments show a personal God who sees repentance, hears intercession, and acts with justice and mercy.
And the Lord repented of the evil which he thought to do unto his people.
Warnings can be invitations to turn
Through Jeremiah, God explained a pattern behind many biblical warnings. If he announces judgement against a nation and that nation turns from evil, he may withhold the judgement. If he promises blessing and people turn to evil, he may withhold the blessing (Jeremiah 18:7-10). The warning is real, but it can also be a merciful call to repent.
So when the Bible says God “relented”, it does not mean his nature suddenly changed. It means his action toward people changed because their response changed. His stated character and moral purposes remained steady throughout.
At what instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy it; If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them. And at what instant I shall speak concerning a nation, and concerning a kingdom, to build and to plant it; If it do evil in my sight, that it obey not my voice, then I will repent of the good, wherewith I said I would benefit them.
Prayer is one of God’s chosen means
Jesus teaches that the Father already knows what his children need before they ask (Matthew 6:8). Still, Jesus also tells them to ask, seek, and knock (Matthew 7:7). God’s knowledge does not cancel prayer. Rather, he has chosen to work through the prayers of his people.
James points to Elijah as an example. He prayed earnestly, and God’s purposes unfolded through that prayer (James 5:16-18). This is why Christians can pray honestly for healing, guidance, changed circumstances, and mercy. Pray boldly, then trust that God’s answer will come from wiser love than your own.
You do not need to solve every mystery before you pray. Bring the request to God plainly. Keep listening to Scripture, keep asking, and leave room for him to answer in ways you may not expect.