His grandfather (Karl Alfred von Hase) was devoted to cultivating the memory of his famous father, Karl August von Hase, professor of church and dogmatic history in Jena. The figure of this great ancestor influenced Dietrich, although he did not follow the same theological direction. At the same time, the story of his life fascinated Dietrich. 

~ Eberhard Bethge, Dietrich Bonhoeffer: A Biography (Revised Edition); Chapter 1: Childhood and Youth: 1906-1923, 5.