George Mueller emphasizes the unchangeable power of God, asserting that God's ability to perform miracles remains as strong today as it was in biblical times. He encourages believers not to doubt God's capacity to answer prayers and perform wonders, regardless of the era they live in. Mueller reminds us that while God may not always work miracles, He can achieve His purposes through ordinary means, and we should remain hopeful for great blessings. He illustrates this with the story of Peter's deliverance, highlighting that divine intervention is often tailored to our needs. Ultimately, Mueller calls on Christians to trust in God's enduring power and to expect His blessings in their lives.