Harry Ironside emphasizes the necessity of exposing error within the church, arguing that much of the New Testament is dedicated to warning against false teachings and heresies. He highlights the importance of contending for the faith and the dangers posed by false prophets, urging believers to be vigilant and to reprove unfruitful works of darkness. Ironside asserts that while exposing error may be unpopular, it is a vital duty for Christians to protect the integrity of the Gospel and the person of Christ. He encourages believers to remain steadfast in their faith, recognizing that the battle against error is essential for the salvation of souls. Ultimately, he calls for a commitment to truth, even in the face of opposition.