The sermon focuses on the story of Jonah, a prophet who initially disobeys God's command to go to Nineveh and warn its people of impending judgment due to their wickedness. Despite Jonah's reluctance and attempt to flee, God orchestrates events to ensure Jonah fulfills his mission. The people of Nineveh repent, and God spares them from destruction. The sermon emphasizes God's relentless pursuit to deliver His word and love to all, regardless of their past, and highlights the importance of obedience and repentance.