G. Campbell Morgan emphasizes the vital role of the Church in teaching and proclaiming the Word of Truth, as outlined in Ephesians 4:11. He explains that the Church is called to incarnate the Word and illuminate the darkness of the world through the diverse gifts of apostles, prophets, evangelists, pastors, and teachers. The apostolic function is to express truth in a balanced manner, while the pastoral role involves nurturing the congregation and leading them to a deeper understanding of their faith. Morgan highlights the importance of enthusiasm within the Church, as exemplified by the Day of Pentecost, where the fervor of the Church attracted many to the message of salvation. Ultimately, he asserts that the Church must fulfill its mission of being the pillar and ground of truth to impact the world effectively.