Harry Ironside discusses 'The Lord's Day, Its Privileges and Responsibilities,' emphasizing the significance of the Sabbath as a memorial of creation and the Lord's Day as a celebration of Christ's resurrection. He explains that while the Sabbath was a commandment for Israel, the Lord's Day is a new covenant privilege for Christians, meant for worship and spiritual growth. Ironside warns against the misuse of the Lord's Day for personal pleasure, urging believers to honor it as a day dedicated to God. He highlights the importance of gathering for worship and the spiritual blessings that come from observing the Lord's Day correctly. Ultimately, he points to Jesus as the true source of rest and fulfillment for believers.