In volume 3 of Tracts and Treatises you can find Calvin’s 1547 critical commentary on the canons and decrees of the Council of Trent. It’s an excellent resource that not only sheds theological light on the central aspects of the Reformation, it’s also a wonderful and edifying defense of the solas and the doctrines of grace. Here are some of Calvin’s helpful comments on the distinction between justification and sanctification:
It is not to be denied, however, that the two things, Justification and Sanctification, are constantly conjoined and cohere; but from this it is erroneously inferred that they are one and the same. For example: The light of the sun, though never unaccompanied with heat, is not to be considered heat. Where is the man so undiscerning as not to distinguish the one from the other? We acknowledge, then, that as soon as any one is justified, renewal also necessarily follows: and there is no dispute as to whether or not Christ sanctifies all whom he justifies. It were to rend the gospel, and divide Christ himself, to attempt to separate the righteousness which we obtain by faith from repentance.
The whole dispute is as to The Cause of Justification. The Fathers of Trent pretend that it is twofold, as if we were justified partly by forgiveness of sins and partly by spiritual regeneration; or, to express their view in other words, as if our righteousness were composed partly of imputation, partly of quality.
I maintain that it is one, and simple, and is wholly included in the gratuitous acceptance of God. I besides hold that it is without us [outside of us], because we are righteous in Christ only. Let them produce evidence from Scripture, if they have any, to convince us of their doctrine. I, while I have the whole Scripture supporting me, will now be satisfied with this one reason, viz., that when mention is made of the righteousness of works, the law and the gospel place it [righteousness of works] in the perfect obedience of the law; and as that nowhere appears, they leave us no alternative but to flee to Christ alone, that we may be regarded as righteous in him, not being so in ourselves. Will they produce to us one passage which declares that begun newness of life is approved by God as righteousness either in whole or in part? But if they are devoid of authority, why may we not be permitted to repudiate the figment of partial justification which they here obtrude [impose]?
…I, on the contrary, while I admit that we are never received into the favour of God without being at the same time regenerated to holiness of life, contend that it is false to say that any part of righteousness (justification) consists in quality, or in the habit which resides in us, and that we are righteous (justified) only by gratuitous acceptance. For when the Apostle teaches that “by the obedience of one many were made righteous,” (Rom. 6:19,) he sufficiently shews, if I mistake not, that the righteousness wanting in ourselves is borrowed elsewhere. …For however small the portion attributed to our work, to that extent faith will waver, and our whole salvation be endangered.
Covenant Presbyterian Church (OPC)
Hammond, WI, 54015