Jesus did not need a magical formula to exorcize this demon, as other exorcists of His day did. [1] He simply ordered it to be quiet and to leave the man. Jesus probably commanded the demon to "be muzzled" (Gr. phimotheti) because He desired to maintain control as He revealed His identity. The Jews might have mobbed Jesus because He fed and healed them. The Romans might have concluded that He was mobilizing an insurrection to overthrow the government and could have arrested Him prematurely. [source][source][source]
"At his trial we discover why Jesus hides his identity. Upon openly declaring who he Isaiah , the authorities condemn him to death for blasphemy. The dilemma for Jesus is this: how can he inaugurate God"s rule, yet evade the efforts of the authorities to trap him? Many aspects of the secrecy motif are related to this problem." [2][source]
The malignant nature of the demon is evident in its treatment of the man. [source][source][source]
Jesus" authority over demons showed that He had power as God"s Servant to destroy the devil and his agents. Mark continued to stress Jesus" continuing conflict with demonic forces and power over them in his Gospel. This emphasis would have given his original suffering readers encouragement that Jesus" power could overcome any enemy that might assail them. [source][source][source]
"We expect a servant to be under authority and to take orders, but God"s Servant exercises authority and gives orders-even to demons-and His orders are obeyed." [3][source]
"To have allowed the defensive utterance of the demon to go unrebuked would have been to compromise the purpose for which Jesus came into the world, to confront Satan and strip him of his power. As such, this initial act of exorcism in the ministry of Jesus is programmatic of the sustained conflict with the demons which is a marked characteristic in the Marcan presentation of the gospel." [4][source]