Zac Poonen emphasizes the significance of the inner life in the New Covenant, contrasting it with the Old Covenant's external standards. He explains that overcoming the world, which is ruled by the devil, is a key aspect of the New Covenant, and that true victory comes from living in the world without being influenced by it. Poonen highlights Jesus as the ultimate example of this, who lived among people yet remained untainted by worldly desires. He encourages believers to recognize their spiritual poverty and dependence on God, urging them to seek the Holy Spirit's power to live a life that reflects the teachings of Jesus, particularly as outlined in the Sermon on the Mount. The sermon concludes with a call to action for Christians to embody these principles in their daily lives.