K.P. Yohannan emphasizes the importance of maintaining pure motivations in ministry, using the examples of Paul, his coworkers, Gehazi, and the church in Ephesus. He highlights how initial zeal can fade into self-interest, leading to a loss of focus on serving Christ above all else. Yohannan warns against the dangers of seeking personal gain or recognition in ministry, which can corrupt one's heart and purpose. He encourages believers to keep their hearts diligent and to serve out of love for Jesus, just as Paul did throughout his life. The sermon serves as a reminder that true service to God requires selflessness and a commitment to His will over personal ambitions.