J. Gresham Machen in Christianity & Liberalism:
The atoning death of Christ, and that alone, has presented sinners as righteous in God’s sight; the Lord Jesus has paid the full penalty of their sins, and clothed them with His perfect righteousness before the judgment seat of God.
But Christ has done for Christians even far more than that. He has given to them not only a new and right relation to God, but a new life in God’s presence for evermore. He has saved them from the power as well as from the guilt of sin.
The New Testament does not end with the death of Christ; it does not end with the triumphant words of Jesus on the Cross, ‘It is finished.’ The death was followed by the resurrection, and the resurrection like the death was for our sakes.
Jesus rose from the dead into a new life of glory and power, and into that life He brings those for whom He died. The Christian, on the basis of Christ’s redeeming work, not only has died unto sin, but also lives unto God.