As was mentioned, "The Sabbath was made FOR man, not man for the Sabbath". The Sabbath was just given as a day off from work. Working seven days a week would be a grind that would eventually exhaust and mentally tire. Therefore, to keep it "holy" was to understand that to continue to work the complete week, without a day of rest, would be unprofitable physically. Man has taken this commandment and made it into a shrine, in which it was not intended.