"We must, after all, confess that in certain other articles the enthusiasts hold views which accord with Scripture and God's Word and that although they are impious heretics and blasphemers of Christ, he who hears and believes them on these points shall be saved. That God proclaims His Word even through the wicked and the godless is not an insignificant blessing (Gnad). In fact, in some respects it is more dangerous for Him to proclaim it through holy than through unholy people, for then those who lack understanding fall into the error of attaching more importance to the holiness of men than to the Word of God. In this way more honor is ascribed to men than to God and His Word. The danger of doing this does not exist if Judas, Caiaphas, and Herod preach. At the same time, no one is excused for his evil life, even though God is able to use it for a good purpose."
What Luther Says, An Anthology, 3 vols., ed. Ewald M. Plass St. Louis: Concordia Publishing House, 1959, III, p. 1467f. Letter, 1528, about Anabaptists.