When God says, Keep holy the seventh day, he does not mean the sixth, nor the first, but the very day he has specified. If men substitute a common day for the sacred, and say that will do just as well, they insult the Maker of the heavens and of the earth, who made the Sabbath to commemorate his resting upon the seventh day, after creating the world in six days. It is dangerous business in the service of God to deviate from his institutions. Those who have to do with God, who is infinite, and who explicitly directs in regard to his own worship, should follow the exact course he has prescribed, and not feel at liberty to deviate in the least particular because they think it will answer just as well. God will teach all his creatures that he means just what he says. {1SP 280.1}