God doesn’t change

For I am the LORD, I change not. (Malachi 3:6)

The immutability of God—or His unchangeableness or constancy—is part of His divine nature. It means that God doesn’t change in His being, His perfections, His purposes, and promises. He doesn’t change in His nature or character.

God’s character, His attributes or perfections, don’t change. He is always good, loving, just, righteous, holy, all-knowing, all-powerful, etc. There is never any varying in these things. He is constant.

God doesn’t change in regard to His Word and His promises. If He stopped honouring His promises, if He acted contrary to His Word, then He couldn’t be trusted. The promise of salvation, of eternal life, and His willingness to answer prayer, would all be in question.

If God could change, then these bedrock foundations of our faith could change. But His promises and Word remain forever. “Your Word, O Lord, is eternal; it stands firm in the heavens.” (Psalm 119:89) – Peter Amsterdam [1]

Remember God is the same, whatever is removed. Your friends may be disaffected, your ministers may be taken away, everything may change, but God does not. Your brethren may change and cast out your name as vile: but God will love you still. - Charles Spurgeon

[1] Anchor The Unchangeable Nature of God