G.W. North emphasizes the necessity of being filled with the same Spirit as members of Christ's body, ensuring unity and purpose among believers. He explains that the Spirit must not only dwell in each member but also actively work through them, allowing for diverse functions within the body of Christ. North warns against incomplete experiences due to a lack of understanding of the Spirit's role, urging believers to recognize their eternal life and functional capacity in Christ. He highlights that all gifts and operations come from the same Spirit, reinforcing the idea that they are not for personal ownership but for the collective purpose of the body. Ultimately, the sermon calls for a deeper awareness of the Spirit's work in each believer to manifest God's glory.