So the whole of the message of Advent becomes an urgent sermon, calling men and women to repentance. Before Jesus came John the Baptist, and we must not over him. For the whole of the early Christians, Advent was a time for repentance, not for rejoicing. All the hymns that we have sung speak of this and it seems to me that it is right that we should have sung with repentant hearts. (But now it is true that in three days, Christmas will come once again. The great transformation will once again happen. God would have it so. Out of the waiting, hoping, longing world will come in which the promise is given. All crying will be stilled. No tears shall flow. No lonely sorrow shall afflict us any more, or threaten. The One who helps us is there. He, who never leaves us alone, is there (DBW, 10:582-87).
A Bonhoeffer Advent Reflection: “the message of Advent . . . repentance”