In this sermon, the preacher discusses a story from the Bible about a wise woman who saves her city from a siege. The woman approaches Joab, a military leader, and proposes a solution to the impending destruction of their city. She suggests killing a troublemaker and throwing his head over the wall, which ultimately leads to the enemy army withdrawing. The preacher emphasizes the importance of not being swayed by catchy slogans and the potential dangers of following popular ideas without caution. The sermon also highlights the challenges faced by David, who is dealing with civil war and questioning his own worthiness as a leader.