In the New Testament we see three different Peters, but all the same man. In the Gospels his name is Simon, who is up and down, hot and cold, and impulsive, but Jesus called him Peter, a rock- after Pentecost we see a Peter who is full of power- finally an old and wise Peter, the apostle of hope. He wants to comfort and console those people in their suffering. The theme is truly knowing God through Jesus Christ.