Paul realised that the reason the Galatians had fallen into legalism, was that they had lost sight of the Cross, and that the antidote to legalism is to present the finished work of Christ on the Cross. We see how the Great Exchange of our sin and His righteousness, accomplished on the Cross, is the basis for us receiving the imputed righteousness of Christ, when we believe in Him, which in turn is the basis for our justification through faith alone. Moreover, we see that at the same time we are justified by faith, Christ's righteousness is imparted to our spirit, causing the New Birth. Also, we receive the indwelling Holy Spirit. We also discuss the nature of saving faith, and the importance of knowing that we are truly born again, through receiving Jesus as our Saviour and Lord.