While waiting in a Nazi prison cell in 1943 a few weeks before Advent, Dietrich Bonhoeffer wrote a friend, "A prison cell, in which one waits, hopes, does various unessential things, and is completely dependent on the fact that the door of freedom has to be opened from the outside, is not a bad picture of Advent."

Shortly after penning those words, the Nazis executed Bonhoeffer. But he was right: the door of freedom for him and for us today is still opened from the outside by the coming and second coming of Jesus Christ.