F.B. Meyer emphasizes the transition from the Old Testament's strict justice to the New Testament's mercy, illustrating this through the story of Elijah and King Ahaziah. He highlights how Elijah's actions were driven by zeal for God's glory rather than personal vendetta, contrasting this with Christ's example of meekness and self-control. Meyer calls for a renewed understanding of sin and God's wrath, suggesting that a deeper conviction of sin is necessary for the acceptance of God's mercy. He encourages believers to emulate Elijah's courage and faith, standing firm in their convictions while embodying the love of Christ. Ultimately, the sermon serves as a reminder of the balance between God's justice and mercy in the life of a believer.