WLC Q.77: Wherein do justification and sanctification differ?
Although sanctification be inseparably joined with justification, (1 Cor. 6:11, 1 Cor. 1:30) yet they differ, in that God in justification impureth the righteousness of Christ; (Rom. 4:6 ,8) in sanctification of his Spirit infuseth grace, and enableth to the exercise thereof; (Ezek. 36:27) in the former, sin is pardoned; (Rom. 3:24–25) in the other, it is subdued: (Rom. 6:6,14) the one doth equally free all believers from the revenging wrath of God, and that perfectly in this life, that they never fall into condemnation (Rom. 8:33–34) the other is neither equal in all, (1 John 2:12–14, Heb. 5:12–14) nor in this life perfect in any, (1 John 1:8,10) but growing up to perfection. (2 Cor. 7:1, Phil. 3:12–14)