St. Peter and St. Paul were pillars of the early Church, and both of them gave their lives as witnesses to Jesus. The Bible, however, makes it clear that Peter and Paul were flawed and imperfect men. Peter denied Jesus three times, and Paul persecuted Christians until a very dramatic grace changed the course of his life. They were both sinners, but they gave their lives to Jesus and He did great things with them. We are sinners, but if we give our lives to Jesus, He can do great things with us.