Exorcism
In Catholic practice the person performing the exorcism, known as an exorcist, is an ordained priest. The exorcist recites prayers according to the rubrics of the rite, and may make use of religious materials such as icons and sacramentals. The exorcist invokes God—specifically the Name of Jesus—as well as members of the Church Triumphant and the Archangel Michael to intervene with the exorcism. According to Catholic understanding, several weekly exorcisms over many years are sometimes required to expel a deeply entrenched demon.
Mark 1
He then performs an exorcism on a demon possessed man. Curing people, especially possessed people, will be another major method Jesus uses in his mission in Mark. The demon recognizes Jesus as "the Holy one of God", the first time Jesus' supernatural opponents are shown to know his true identity. Jesus simply says "Be quiet, and come out of him!", healing the man with words alone. The people are amazed. This follows a path Mark often uses, that of a description of the affliction, Jesus' cure of the affliction, and then a demonstration of the cure to others. The power of Jesus' word over the demon might be Mark's way of trying to show to his audience, perhaps under the threat of persecution, that Jesus' message will overcome evil. By showing Jesus' teaching first before his exorcism Mark might be placing emphasis on Jesus' teachings as more important that any miracle he could perform.