Zac Poonen emphasizes that both our need for salvation and the ability to live a life pleasing to God can only be met through His power, not our own strength. He notes that while some believers recognize this early and seek God's power, others struggle for years before turning to Him, and some resign themselves to a life of defeat. Poonen highlights the importance of the Holy Spirit, explaining that being born of the Spirit makes us children of God, but being baptized in the Holy Spirit empowers us to fulfill God's will and serve effectively. He encourages believers to seek the Holy Spirit's power to become bold witnesses for Christ, rather than accepting limitations as part of their personality. Ultimately, the sermon calls for reliance on God's strength to live victoriously and serve faithfully.