"We must note the foundations. For we are justified by faith, not because it is so firm, robust, and perfect a virtue, but because of the object on which it lays hold, namely Christ, who is the Mediator in the promise of grace. Therefore when faith does not err in its object, but lays hold on that true object, although with a weak faith, or at least tries and wants to lay hold on Christ, then there is true faith, and it justifies. The reason for this is demonstrated in those lovely statements in Philippians 3:12: 'I apprehend, or rather I am apprehended by Christ' and Galatians 4:9: 'You have known God, or rather have been known by God.' Scripture shows a beautiful example of this in Mark 9:24: 'I believe; help my unbelief.'" Martin Chemnitz, Loci Theologici, 2 vols., trans. J. A. O. Preus, St. Louis: Concordia Publishing House, 1989, II, p. 503. Philippians 3:12; Galatians 4:9; Mark 9:24
"Therefore God, 'who is rich in mercy' [Ephesians 2:4], has had mercy upon us and has set forth a propitiation through faith in the blood of Christ, and those who flee as suppliants to this throne of grace He absolves from the comprehensive sentence of condemnation, and by the imputation of the righteousness of His Son, which they grasp in faith, He pronounces them righteous, receives them into grace, and adjudges them to be heirs of eternal life. This is certainly the judicial meaning of the word 'justification,' in almost the same way that a guilty man who has been sentenced before the bar of justice is acquitted." Martin Chemnitz, Loci Theologici, 2 vols., trans. J. A. O. Preus, St. Louis: Concordia Publishing House, 1989, II, p. 482. Ephesians 2:4
"For we are not justified because of our faith (propter fidem), in the sense of faith being a virtue or good work on our part. Thuse we pray, as did the man in Mark 9:24: 'I believe, Lord; help my unbelief'; and with the apostles: 'Lord, increase our faith,' Luke 17:5." Martin Chemnitz, Loci Theologici, 2 vols., trans. J. A. O. Preus, St. Louis: Concordia Publishing House, 1989, II, p. 506 Mark 9:24; Luke 17:5
We need to say something.
Notice what Chemnitz is doing here. He sets forth why faith justifies. What is it about Christ that we are to trust about, that God imputes the righteousness of Christ to the one who is holding on to Christ as propitiator through his death at the Cross. Notice too what Chemnitz did not do that Walther and Pieper did. Chemnitz did not say - you are saved to believe (contra Walther). Nor did he say (contra Pieper) - "I would eliminate faith as a requirement that makes justification true. That would be making faith a work of mine".
None of these.