Jesus delivered people from demonic forces by the power of God. His authoritative command sufficed. The same power of God's Word and God's Holy Spirit have been passed on through Jesus Christ to every believer.
Therefore, Christians should not engage in the foolish behavior of the Sons of Sceva; practicing in the occult act of exorcism. There is no need to play spiritual and psychological games with the enemy.
Cast out demons by the power and authority of Jesus Christ. To His name every knee shall bow and every tongue confess that Jesus is Lord of Lords and King of Kings.