Horatius Bonar emphasizes the importance of listening to God, who speaks peace to His people. He outlines the roles of the listener, the speaker, and the message, highlighting that true peace comes from God and is essential for a holy life. Bonar explains that peace must precede holiness, as reconciliation with God is the foundation for spiritual growth. He warns against returning to folly, urging believers to embrace the peace offered by God and live consistently in holiness. The sermon calls for a life dedicated to listening to God's voice and responding to His message of peace.