Leonard Ravenhill addresses the pervasive influence of Satan in the world, emphasizing the need for believers to recognize their adversary and the spiritual warfare they face. He highlights the importance of strength in adversity, referencing Peter's warning about the devil as a roaring lion, and encourages Christians to put on the full armor of God to withstand the enemy's attacks. Ravenhill also discusses the deceptive nature of Satan, who misrepresents God and tempts believers with power and shortcuts, urging the congregation to remain vigilant and grounded in their faith. He concludes by reminding them of the power they have through Christ to resist the devil and the necessity of daily choosing to serve God.