We can mention only one point (which experience confirms), namely, that next to the Word of God, music deserves the highest praise. No greater commendation than this can be found — at least not by us. After all, the gift of language combined with the gift of song was only given to man to let him know that he should praise God with both word and music, namely, by proclaiming [the Word of God] through music.
Martin LutherAll laws and philosophy merely tell us what should be done, but they do not provide the strength to do it.
Martin LutherWhilst a man is persuaded that he has it in his power to contribute anything, be it ever so little, to his salvation, he remains in carnal self-confidence; he is not a self-despairer, and therefore is not duly humbled before God, he believes he may lend a helping hand in his salvation, but on the contrary, whoever is truly convinced that the whole work depends singly on the will of God, such a person renounces his own will and strength; he waits and prays for the operation of God, nor waits and prays in vain
Martin LutherChrist is the Master; the Scriptures are only the servant. The true way to test all the Books is to see whether they work the will of Christ or not. No Book which does not preach Christ can be apostolic, though Peter or Paul were its author. And no Book which does preach Christ can fail to be apostolic, although Judas, Ananias, Pilate, or Herod were its author.
Martin Luther