How does Dietrich Bonhoeffer use imagery in Life Together: The Classic Exploration of Faith in Community?

Bonhoeffer uses the times of day and night as imagery to illustrate Christ's effect on the world. Christ is born in the dark of night to bring light into the world. He is crucified, suffers and dies on the cross in full light of midday. The light of day turns to darkness at his death and burial in a grave. He conquers death by rising from the dark grave in the light of dawn on Easter. Therefore, the community's daily devotions begin at dawn.