From Bonhoeffer's Letters & Papers From Prison

What is bothering me incessantly is the question what Christianity really is, or indeed who Christ really is, for us today. The time when people could be told everything by means of words, whether theological or pious, is over, and so is the time of inwardness and conscience--and that means the time of religion in general. We are moving toward a completely religionless time; people as they are now simply cannot be religious anymore. Even those who honestly describe themselves as "religious" do not in the least act up to it, and so they presumably mean something quite different by "religious."[1]

Our whole nineteen-hundred-year-old Christian preaching and theology rest on the "religious a priori" of mankind. "Christianity" has always been a form--perhaps the true form--of "religion." But if one day it becomes clear that this a priori does not exist at all, but was a historically conditioned and transient form of human self-expression, and if therefore man becomes radically religionless--and I think that that is already more or less the case (else how is it, for example, that this war, in contrast to all previous ones, is not calling forth any "religious" reaction?)--what does that mean for "Christianity"?[2]

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[1] Dietrich Bonhoeffer, Letters and Papers From Prison (New York, Touchstone: 1997) 279.

[2] [Tegel] 30 April 1944 To Eberhard Bethge, Dietrich Bonhoeffer, Letters and Papers From Prison, 281.