This is a lesson about the Second and Third Commandments. It explains the importance of honoring God's name, prohibiting blasphemy, perjury, and misuse of God's name in oaths and vows. The lesson then examines the Third Commandment and the significance of the Lord's Day (Sunday). It explains why Sunday replaced Saturday as the day of worship, emphasizing the resurrection of Christ and the importance of attending Mass. The lesson also stresses the importance of rest and reflection on Sundays.