Paul explains that God has always had only one means of salvation: faith. He rebukes the foolish Galatians for forgetting this fundamental doctrine and trying to be justified by works of the law instead of by faith like Abraham was. Paul argues that anyone who clings to works of the law is cursed, but Christ redeemed believers from this curse by becoming cursed on the cross in their place. He cites Old Testament passages to show that justification by faith, not works, has always been God's plan.