G. Campbell Morgan emphasizes the mission of the Holy Spirit, highlighting His role as the Comforter who abides with believers forever. The Spirit's presence is not temporary; He dwells within each believer, teaching, guiding, and glorifying Christ. Additionally, the Spirit's mission extends to the world, where He convicts of sin, righteousness, and judgment, revealing the truth of Christ and the consequences of unbelief. Morgan underscores the transformative power of the Spirit in both the lives of individuals and the Church as a whole.