The goal of hallowing Sunday[/Sabbath] is the Sunday rest. God wants to lead God’s people to God’s own rest, to relax from the earthly workday…. Freed from imperfect human effort, the people of God are to gaze on the completed pure work of God and to participate in it. As a reflection and promise of this eternal rest with the Creator and Redeemer of the world, the Christian who keeps Sunday holy is permitted to experience Sunday rest.
From: Dietrich Bonhoeffer, Conspiracy and Imprisonment, 1940-1945, p 644