
What shall we say then? Shall we continue in sin, that grace may abound? God forbid.
Rom 6:1-2
Our last sentence may refute the impudent calumny of certain ungodly men, who charge us, first, with destroying good works and leading men away from the study of them, when we say, that men are not justified, and do not merit salvation by works; and, secondly, with making the means of justification too easy, when we say that it consists in the free remission of sins, and thus alluring men to sin to which they are already too much inclined. These calumnies, I say, are sufficiently refuted by that one sentence; however, I will briefly reply to both. The allegation is that justification by faith destroys good works. I will not describe what kind of zealots for good works the persons are who thus charge us. We leave them as much liberty to bring the charge, as they take license to taint the whole world with the pollution of their lives. They pretend to lament, that when faith is so highly extolled works are deprived of their proper place. But what if they are rather ennobled and established? We dream not of a faith which is devoid of good works, nor of a justification which can exist without them: the only difference is, that while we acknowledge that faith and works are necessarily connected, we, however, place justification in faith, not in works. How this is done is easily explained, if we turn to Christ only, to whom our faith is directed and from whom it derives all its power.
Why, then, are we justified by faith? Because by faith we apprehend the righteousness of Christ, which alone reconciles us to God. This faith, however, you cannot apprehend without at the same time apprehending sanctification; for Christ “is made unto us wisdom, and righteousness, and sanctification, and redemption,” (1Co 1: 30). Christ, therefore, justifies no man without also sanctifying him. These blessings are conjoined by a perpetual and inseparable tie. Those whom he enlightens by his wisdom he redeems; whom he redeems he justifies; whom he justifies he sanctifies. But as the question relates only to justification and sanctification, to them let us confine ourselves. Though we distinguish between them, they are both inseparably comprehended in Christ. Would ye then obtain justification in Christ? You must previously possess Christ. But you cannot possess him without being made a partaker of his sanctification: for Christ cannot be divided. Since the Lord, therefore, does not grant us the enjoyment of these blessings without bestowing himself, he bestows both at once but never the one without the other. Thus it appears how true it is that we are justified not without, and yet not by works, since in the participation of Christ, by which we are justified, is contained not less sanctification than justification.
John Calvin. Institutes of the Christian Religion, 3.16.1.