As a believer Jesus has given us the same authority that He was given.  This authority and power puts us back as we were in the garden before the fall.  Little gods, and ruler's once again over every creeping thing in the earth.  That includes satan and his demons.  God is sovereign and in control but He choose to rule and control THROUGH His body.  That's us, the believer.  If we don't cooperate with God, then His power will not flow in the earth!