The article presents the author's view on a subject pertaining to the gospel of Saint Mark particularly the sayings verbalized by Jesus Christ who regarded Peter as "Satan." He argued that the sayings contained in the gospel signify that Mark is trying to convey that Peter was spiritually inhabited by Satan. The author also reveals that Jesus has seen Satan within Peter, and that he was trying to get rid of him. He also offered various interpretations of scholars regarding the passage. Some scholars interpreted it metaphorically, arguing that only the behavior of Peter resembles that of Satan.