To “change one’s mind,” in the New Testament means to repent. When the Bible speaks of my repenting or your repenting, it means that we are called to change our minds or our dispositions with respect to sin—that we are to turn away from evil. Repent is loaded with these kinds of connotations, and when we talk about God’s repenting, it somehow suggests that God has to turn away from doing something wicked. But that’s not what is always meant when the Bible uses this word.
Using a word like repentance with respect to God raises some problems for us. When the Bible describes God for us, it uses human terms, because the only language God has by which to speak to us about himself is our human language. The theological term for this is anthropomorphic language, which is the use of human forms and structures to describe God. When the Bible talks about God’s feet or the right arm of the Lord, we immediately see that as just a human way of speaking about God. But when we use more abstract terms like repent, then we get all befuddled about it.
What About Moses in Numbers 14?
There’s one sense in which it seems God is changing his mind, and there’s another sense in which the Bible says God never changes his mind because God is omniscient. He knows all things from the beginning, and he is immutable. He is unchanging. There’s no shadow of turning within him. For example, He knows what Moses is going to say to him in Numbers 14 before Moses even opens his mouth to plead for the people. Then after Moses has actually said it, does God suddenly changes his mind? He doesn’t have any more information than he had a moment before. Nothing has changed as far as God’s knowledge or his appraisal of the situation.