Does God change His mind? We read so in the Book of Jonah.

“And God saw their works, that they turned from their evil way; and God repented of [or changed his mind concerning] the evil, that He had said He would do unto them; and He did it not” (Jonah 3:10). We get a similar impression from other passages (Genesis 6:7, Exodus 32:14, I Samuel 15:11, Psalm 106:45, Hosea 11:8, Joel 2:13).
Some critics parade this as Scriptural contradiction, reading with statements like, “I am the Lord, I change not” (Malachi 3: 6) or other passages like James 1: 17 or 1 Samuel 15: 29. This contradiction is not real, only apparent. In logic this is called a fallacy of equivocation, i.e. using a word which has two different meanings.
God’s character never changes, but His dealing with people does change. In the Book of Jonah, God’s character has not changed (Jonah 3:10); He is still the same holy and righteous God that He was before Jonah’s preaching. But when the Ninevites changed, God’s dealing with them must change; He decided not to punish them. What changed was the people’s attitude, not God’s standards or His nature.
When a man bicycling against the wind suddenly turns around, it may seem that the wind has changed its direction, although it is blowing just the same way.