“The doctrine of justification was the great natural principle of the Reformation. With respect to the nature of justification the Reformers corrected the error of confounding justification with sanctification by stressing its legal character and representing it an act of God’s free grace, whereby He pardons our sins and accepts us as righteous in His sight, but does not change us inwardly. As far as the ground of justification is concerned, they rejected the idea of Rome that this lies, at least in part, in the inherent righteousness of the regenerate and in good works, and substituted for it the doctrine that it is found only in the imputed righteousness of the Redeemer. And in connection with the means of justification they emphasized the fact that man is justified freely by that faith which receives and rests in Christ only for salvation. Moreover, they rejected the doctrine of progressive justification, and held that it was instantaneous and complete, and did not depend for its completion on some further satisfaction for sin.” (Louis Berkhof, Systematic Theology, 512-513)
— Dr. Marcus J. Serven