Over the course of history, there have been different periods of thought concerning the Lord’s Day. The early post-Apostolic church didn’t connect the Lord’s Day to the fourth commandment, but this connection was made, though not perfectly, by Thomas Aquinas. In this lesson, Dr. Godfrey identifies what was problematic about that basis of Thomas’ connecting the Lord’s Day to the fourth commandment and explores Reformation-era and seventeenth-century consideration of the Lord’s Day, which better reflects the biblical witness concerning the holiness of a weekly Sabbath.