I have not only avoided theological polemics with Protestants, but have carefully refrained from considering Protestantism at all, whether that of to-day or of the two previous centuries. To show the effects of Luther’s work upon the history of the world was not my business. The object of my studies has not been Lutheranism, but Luther himself considered apart from later Protestantism, so far as this was possible; of course, we cannot separate Luther from the effects he produced, he foresaw the results of his work, and the acceptance of this responsibility was quite characteristic of him. I will only say, that the task I set myself in this work closes with the first struggles over his grave. I may remark further, that the Luther of theology, even in Protestant circles, is being considered more and more as an isolated fact. Are there not even many Protestant theologians who at the present day allow him no place whatever in the theological and philosophical doctrines which they hold? Indeed, is it not an understood thing with many of our Protestant contemporaries, to reject entirely or in part the doctrines most peculiar and most dear to Luther. Two years ago the cry was raised for “a further development of religion,” for “a return from Trinitarian to Unitarian Christianity, from the dogmatic to the historic Christ,” and at the same time the Allgemeine Evangelisch-Lutherische Konferenz at Hanover received a broad hint that, instead of wasting time in working for the Lutheran tenets, they would be better employed in devising a Christianity which should suit the needs of the day and unite all Protestants in one body. In these and similar symptoms we cannot fail to see a real renunciation of Luther as the founder of Protestant belief, for there are many who refuse to hold fast even to that rudimentary Christianity which he, in agreement with all preceding ages, continued to advocate. Only on account of his revolt against external authority in religious questions and his bitter opposition to the Papacy, is he still looked up to as a leader. There is therefore all the less reason for the historian, who subjects Luther to his scrutiny, to fear any reproach of having unwarrantably assailed the Protestantism of to-day. As in these pages my only object has been to examine Luther’s person, his interior experiences and his opinions from the point of view of pure history, I think I have the right to refuse beforehand to be drawn into any religious controversy. On the other hand, historical criticism of facts will always be welcomed by me, whether it comes from the Catholic or from the Protestant camp, and will be particularly appreciated wherever it assists in elucidating those questions which still remain unsolved and to which I shall refer when occasion arises.