G. Campbell Morgan emphasizes the expansive ministry of the Holy Spirit beyond the Church, highlighting its prophetic fulfillment on Pentecost and its role in convicting the world of sin, righteousness, and judgment. He explains that the Spirit's work is to reveal truth to all humanity, striving with unbelievers while indwelling believers to maintain their union with Christ. Morgan also discusses the Spirit's restraining influence against evil, asserting that the Spirit's ministry is crucial for both the Church and the world, ultimately pointing to the necessity of preaching the Gospel for the Spirit's work to be realized. The sermon underscores the importance of recognizing the Spirit's active role in the world today.