To "keep holy" by "remembering"
17. The connection between Sabbath rest and the theme of "remembering" God's wonders is found also in the Book of Deuteronomy (5:12-15), where the precept is grounded less in the work of creation than in the work of liberation accomplished by God in the Exodus: "You shall remember that you were a slave in the land of Egypt, and the Lord your God brought you out from there with mighty hand and outstretched arm; therefore the Lord your God commanded you to keep the Sabbath day" (Dt 5:15).
This formulation complements the one we have already seen; and taken together, the two reveal the meaning of "the Lord's Day" within a single theological vision which fuses creation and salvation. Therefore, the main point of the precept is not just any kind of interruption of work, but the celebration of the marvels which God has wrought.
Insofar as this "remembrance" is alive, full of thanksgiving and of the praise of God, human rest on the Lord's Day takes on its full meaning. It is then that man enters the depths of God's "rest" and can experience a tremor of the Creator's joy when, after the creation, he saw that all he had made "was very good" (Gn 1:31).