it was composed, of the adversaries against whom he was contending, and of the progress which he made in his opinions as time went on. The great fund of primary sources which the historical methods of the last generation have made available should also be laid under contribution to shed light upon his statements and his attitude toward the various questions involved in his life-struggles.
As long as a writer can be read only in the language or languages in which he wrote, this necessary closer contact with his personality can be enjoyed only by a very limited circle of advanced scholars. But many of these will be grateful for a translation into their vernacular for more rapid reading, from which they may turn to the standard text when a question of more minute criticism is at stake. Even advanced students appreciate accurately rendered and scholarly annotated translations, by which the range of the leaders of human thought, with whom it is possible for them to be occupied, may be greatly enlarged. Such series of translations as those comprised in the well-edited Ante-Nicene, Nicene and Post-Nicene Libraries of the Fathers have served a most excellent purpose.
In the series introduced by this volume the attempt is made to render a similar service with respect to Luther. This is no ambitious project to reproduce in English all that he wrote or that fell from his lips in the lecture-room or in the pulpit. The plan has been to furnish within the space of ten volumes a selection of such treatises as are either of most permanent value, or supply the best means for obtaining a true view of his many-sided literary activity and the sources of his abiding influence. The aim is not to popularize the writer, but to make the English, as far as possible, a faithful reproduction of the German or Latin. The work has been done by a small group of scholarly Lutheran pastors, residing near each other, and jointly preparing the copy for the printer. The first draft of each translation was thoroughly discussed and revised in a joint
