In Galatians 2 we get to hear a little of the Apostle Paul's life and we even get to hear about an argument that Paul has with Peter. Peter was wrong. Peter sinned. I love that God doesn't hesitate to share people's failures to show God's forgiveness. We hear without a doubt, doing good stuff doesn't earn us justification. The Law's job is to kill us, so God can make us alive in Christ Jesus and declare us righteous in His eyes. God gets all the credit.