How do we know God's power can change lives?

The sermon emphasizes that true conversion and change in a person's life do not occur through great acts or displays, such as the mighty wind, earthquake, or fire that Elijah experienced. Rather, it is the still small voice of God that brings about spiritual awakening and transformation in the heart. God teaches us that it is not enough to see powerful displays of His might; instead, the true nature of His power lies in the quiet, inward call to faith and repentance through Christ. This transforms a person's heart and life in ways that outward manifestations cannot achieve.