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God expressly prescribed obedience, to be given first to the natural laws inscribed on his heart (Rom. 2:15), and then to the positive law to abstain from the tree of the knowledge of good and evil. God urged this obedience at that time as the condition of the covenant of works, to merit by its aid eternal life. There was also added to this natural worship a certain instituted worship, to be exercised by the sanctification of the seventh day (Gen. 2:2), by abstaining from everyday concerns and more expressly sanctifying the day by religious exercises. This would have been the religious life of man in paradise.