The purpose of the book of Acts is to continue the expressed purpose of the Gospel of Luke, namely, to expound “all that Jesus began to do and teach” (Acts 1:1). The author’s first attempt to this end is his inclusion of Jesus’ command for his disciples to wait in Jerusalem for the coming Spirit (1:4). When the Spirit arrives on the day of Pentecost, Peter represents the apostles as he addresses the crowd and explains the phenomenon. Peter locates the Pentecost event in the category of prophetic fulfillment, and, for Peter, this has profound implications for the identity of Jesus of Nazareth. Peter’s sermon is particularly significant because it is, presumably, the earliest public declaration about the nature of Christ made by the apostolic church. If Luke’s narrative is reliable—something that Luke evidently intends for his readers to believe (Bruce 82)—then it provides a glimpse into what the infant church believed about the person of Jesus. It seems that, for Luke, Christology at its inception is high Christology.