The importance of this Commentary on Galatians for the history of Protestantism is very great. It presents like no other of Luther’s writings the central thought of Christianity, the justification of the sinner for the sake of Christ’s merits alone. We have permitted in the final revision of the manuscript many a passage to stand which seemed weak and ineffectual when compared with the trumpet tones of the Latin original. But the essence of Luther’s lectures is there. May the reader accept with indulgence where in this translation we have gone too far in modernizing Luther’s expression—making him “talk American.”