Dietrich Bonhoeffer first days in prison weighed heavily on him as he contemplated what could happen next to him and his family and friends.  Yet, Bonhoeffer did eventually cope and endure…

That Bonhoeffer’s inward power of resistance was indeed strong enough, the letters written during the next two and a half years were abundantly to prove.  It was a strength which can be seen as the gift of God through the prayer which had become the foundation of Bonhoeffer’s life in the years of success and freedom, and which did not fail him now.

(Mary Bosanquet, The Life and Death of Dietrich Bonhoeffer, 248)