Hence, even though the converted and believing [in Christ] have incipient renewal, sanctification, love, virtue, and good works, yet these neither can nor should be drawn into, or mingled with, the article of justification before God, in order that the honor due Him may remain with Christ the Redeemer, and tempted consciences may have a sure consolation, since our new obedience is incomplete and impure...By faith alone in Christ we are justified before God and saved. For thereby works are excluded, not in the sense that a true faith can exist without contrition, or that good works should, must, and dare not follow true faith as sure and indubitable fruits, or that believers dare not nor must do anything good; but good works are excluded from the article of justification before God, so that they must not be drawn into, woven into, or mingled with the transaction of the justification of the poor sinner before God as necessary or belonging thereto...
1. That thereby [through these particles] all our own works, merit, worthiness, glory, and confidence in all our works are entirely excluded in the article of justification so that our works shall not be constituted or regarded as either the cause or the merit of justification, neither entirely, nor half, nor in the least part, upon which God could or ought to look, or we to rely in this article and action.
2. That this remain the office and property of faith alone, that it alone, and nothing else whatever, is the means or instrument by and through which God's grace and the merit of Christ in the promise of the Gospel are received, apprehended, accepted, applied to us, and appropriated; and that from this office and property of such application or appropriation love and all other virtues or works are excluded.
3. That neither renewal, sanctification, virtues nor good works are tamquam forma aut pars aut causa iustificationis, that is, our righteousness before God, nor are they to be constituted and set up as a part or cause of our righteousness, or otherwise under any pretext, title, or name whatever to be mingled in the article of justification as necessary and belonging thereto; but that the righteousness of faith consists alone in the forgiveness of sins out of pure grace, for the sake of Christ's merit alone; which blessings are offered us in the promise of the Gospel, and are received, accepted, applied, and appropriated by faith alone.
Formula of Concord, Solid Declaration, Of the Righteousness of Faith before God, 1580