David Wilkerson emphasizes the necessity of a personal revelation of Jesus Christ for preachers, missionaries, and teachers. He challenges the audience to reflect on whether their teachings stem from personal experience or merely repeat what others have said. Wilkerson stresses that true ministry requires a continuous flow of revelation from the Holy Spirit, which transforms the preacher and their message. He warns against preaching a gospel that has not deeply impacted one's own life, echoing Paul's concern about being unapproved before God. Ultimately, he calls for a singular focus on Christ, urging believers to count all else as loss for the sake of knowing Him.