We should rest in Christ alone for our salvation. But along with that there is still an abiding principle that we ought to worship on the Lord’s Day and trust God enough to have a weekly routine where we cease from our normal labors... He made the Sabbath for man, not man for the Sabbath (Mark 2:27). God gives us Sabbath as a gift; it’s an island of get-to in a sea of have-to. He also offers us Sabbath as a test; it’s an opportunity to trust God’s work more than our own. When I go weeks without taking adequate time off, I may or may not be disobeying the fourth commandment, but I’m certainly too convinced of my own importance and more than a little foolish. If my goal is God-glorifying productivity over a lifetime of hard work, there are few things I need more than a regular rhythm of rest.