In this chapter, Luke brings out the comparison between Peter and the church with Herod. We see the seemingly powerless church meet divine rescue. To all intents and purposes, the church is powerless in comparison to the might and power of Herod. Yet the church is mighty through prayer. Herod we find to be powerless as he meets divine judgement.
In this, God demonstrates his power and assures us that the gospel will advance. We are called to prayer in our own weaknesses and challenged to have our hearts shaped by the gospel.