Final answer:
The Book of Mark highlights the themes of Jesus as the Messiah and the nature of discipleship with suffering, both exemplified in the story of Caesarea Philippi in Mark 8.
Step-by-step explanation:
The Book of Mark in the New Testament is laden with several major themes, but two stand out prominently: the identity of Jesus as the Messiah and the notion of discipleship and suffering. In the story of Caesarea Philippi found in Mark 8, these themes are central as Jesus asks his disciples who people say he is and then who they say he is. Peter's confession of Jesus as the Christ is a pivotal moment that reveals the theme of recognizing Jesus' true identity.
In terms of discipleship and suffering, directly following Peter's confession, Jesus begins to teach them about the suffering he must endure. This serves as an introduction to the costs and demands of true discipleship, which requires self-denial and bearing one's own cross. This reflects the theme that following Jesus is inextricably linked with sacrifice and hardship, contrary to expectations of the Messiah bringing immediate political liberation.