The document discusses theories about the origins and authorship of the Gospel of Mark. It suggests that some early sources identify the author as Mark, the companion of Peter, and that the gospel was written based on Peter's oral preaching in Rome. The document also notes that the gospel contains many Latinisms and phrases peculiar to Rome, supporting the idea that it was written for a Roman audience. Finally, it summarizes that the gospel emphasizes Jesus' humanity and portrays him as a man of action focused on serving others through his teachings and miracles.