The Lord repenting does not mean the same as believers repenting from sin. The suggestion would be then that the Lord somehow was going to do something evil and was talked out of it. The truth is simply that the Lord changed His mind. It may for instance not have been His plan to begin with and that He was using this discussion as a teachable moment (what if I). I remember as a father proposing different forms of discipline with my children to get them to think about their wrong (what if I take away television privileges for a week?). Another way of thinking it is that the Lord had options, out of these options he was going to do this (and would have been within His rights to do so) but, chose rather to do that.
The land could not bear words of Amos' mouth. He was being blamed for everything that was going on. No, it wasn't the idolatry or the thievery or the oppression or deceit, it was the words of one minor herdsman prophet near Bethel. The well meaning friend is just as off by trying to talk Amos into moving to Judah for his own safety. When it is God's words one better hold true.
2012 - pBiblx2 Field Wise Bible System Version 2.0.9d - GPL3