Perhaps it is the consistency and credibility of his admirable understanding of his cultural and church traditions, and the way in which he accepted the shaking of these foundations, while he lived and conceived a new Christianity for the future. Perhaps part of our sense of his conviction comes from the incompleteness of the of the man and his answers–because he presents us, not with a finished doctrine, but with an active process of learning. Perhaps it was a strong identity he preserved, even as he wrestled with a complexity of themes, answers, and problems. Perhaps we are fascinated by his utterly unfashionable renunciation of publicity. Perhaps, too, it was the triumph of his humanity over its betrayal by the means he was forced to use. To explain the widespread attention that has been given to his theological contentions, Christian testimony, and actions, we must look along all these lines. 

~ Eberhard Bethge, Dietrich Bonhoeffer: A Biography (Revised Edition); Preface to the First English Edition (1970), xiii.