The rich world of  his ancestors set the standards for Dietrich Bonhoeffer’s own life. It gave him a certainty of judgement and manner that cannot be acquired in a single generation. He grew up in a family that believed that the essence of learning lay not in a formal education but in the deeply rooted obligation to be guardians of a great historical obligation and intellectual tradition. To Dietrich Bonhoeffer, this meant learning to understand and respect the ideas and experiences of earlier generations It could also lead him to decisions and actions that conflicted with those of his ancestors–and, precisely  in this way, to honor them. Ultimately, it might even mean voluntarily accepting history’s inevitable judgement on the world of his ancestors–while not allowing this to distract from delight in its amicable representatives.   

~ Eberhard Bethge, Dietrich Bonhoeffer: A Biography (Revised Edition); Chapter 1: Childhood and Youth: 1906-1923, 13.