The sermon "Knowing God" by Pastor McKinney explores the story of Jonah and highlights four aspects of God's character: making threats, being the King of Kings, burning with anger toward sin, and being abundant in mercy and compassion. It emphasizes that God's nature is rooted in love and a desire for repentance, as seen through Jonah and the people of Nineveh. The sermon urges the congregation to love God with all their hearts and to humble themselves before Him, reflecting on their own understanding of His character. Ultimately, it encourages communion with Jesus as the ultimate peace offering and a celebration of God's attributes.