Here is really good, helping to clarify the relationship between these two doctrines. Also our friend, Dr. R. Scott Clark is clearing away much of the fog Here and here.
It seems to me that part of the confusion is the notion that when talking about our sanctification we shouldn’t be talking about our justification, otherwise… otherwise what? If we bring justification into the mix that will undermine our sanctification? But wait! Isn’t it fair to say that our justification is the very ground upon which we live and walk the sanctified life? So, as I am sanctified I can never leave my justification (what Christ Jesus secured for me on the cross ) anymore then when I walk to the store I can somehow leave the ground of the sidewalk. Not a perfect analogy, but… Every sanctified movement rests upon the ground of our justification.
The old hymn reads, On Christ the solid rock I stand, all other ground is sinking sand… I don’t think this speaks of conversion, but living the Christian life. Calvin concisely puts it this way:
“In short, I affirm, that not by our own merit but by faith alone, are both our persons and works justified; and that the justification of works depends on the justification of the person, as the effect on the cause.” (John Calvin, Acts of the Council of Trent with the Antidote)There's no work of ours sanctified except by the blood of Jesus shed for us (Heb. 10). His finished work then is the basis by which our good works, with their yet remaining imperfections, are purified; causing them (and us) to be acceptable to God by grace through faith in Christ.
Eph. 2:8-10. “For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, 9 not a result of works, so that no one may boast. 10 For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.”
Salvation is completely of God, by God’s grace, through faith alone in Christ alone. None of our own doings contribute to this gift from God. Not one of our best works adds to the saving work that Jesus completed on the cross for His people. Yet we work. And in sanctification, we do acts of goodness that are pleasing and acceptable in Christ to God; works He prepared way back in the counsel of His will that we should walk in. So there is effort, there is resisting sin, there is walking in new paths of righteousness, loving God and neighbor. But those efforts are the fruit of His Spirit, the ordained result of an already graciously and completely secured salvation in Christ Jesus for us. Thus we have no boast or glorying except in the Lord.
We are thankful for those who, like Tullian and Scott Clark, unashamedly and clearly proclaim the gospel of God; “for it is the power of God for salvation to everyone who believes…” (Rom. 1:16)