In this sermon, the preacher focuses on the devotion and departure of Israel. He emphasizes the importance of maintaining a genuine and passionate relationship with God, rather than just going through the motions. The preacher warns against viewing religious activities as mere chores or obligations, as this can lead to a loss of power and victory in one's spiritual life. He also references a story from 1 Samuel chapter 4, where the nation of Israel fails to seek God's guidance in the midst of their defeat, highlighting the danger of leaving God behind while serving Him.