G. Campbell Morgan emphasizes that being filled with the Holy Spirit is not merely a privilege for a select few but a command for all believers, essential for a vibrant Christian life and effective service. He outlines the necessity of both abandonment to God and abiding in Christ as conditions for this filling, highlighting that true Christian character and service stem from the Spirit's control. Morgan warns against the misconception that the filling of the Spirit is tied to specific sensations or experiences, asserting that the true evidence lies in the manifestation of Christ's Lordship and the fruit of the Spirit in one's life. He calls for a personal commitment to yield fully to the Holy Spirit, allowing Him to work through believers to reflect Christ's character and fulfill God's purposes. Ultimately, the sermon challenges Christians to examine their lives and ensure they are not grieving the Spirit but are actively living under His influence.