Fulton Sheen's speech highlights the ongoing struggle between good and evil, focusing on the modern tendency to either trivialize or deny the existence of the devil. He emphasizes that the devil's greatest power lies in being denied or ignored. Sheen explores the devil's nature from both psychiatric and biblical viewpoints, associating him with division, aggression, and confusion. He warns of the diminishing awareness and discussion of the devil among theologians and society, pointing out the consequences of ignoring this malevolent force. The speech concludes by urging listeners to recognize and confront the reality of evil in the world, emphasizing the importance of maintaining faith and discipline in the face of the devil's deceptions.