This introduction or prospectus is supplementary to that in the first volume on the Psalms, in that it likewise emphasizes, though from different view-points, the history and fruits, as well as the present need and future mission of the Protestant Classics of the greatest of all reformers in their relation to the development of the human race. Let us in this introduction briefly notice the following: The progress of the movement to translate and circulate Luther's works in English, and then emphasize the need of developing an interest to read them; first, because of the relation of Luther and his writings to the public library; and secondly, because as the chief of the Teuton Protestant Church Fathers, we need to understand Luther in his relation to the Greek and Latin Church Fathers, and our true historic relations to them all.