From the power of God.
All the disciples were given the power to do so. "And when he had called unto him his twelve disciples, he gave them power against unclean spirits, to cast them out, and to heal all manner of sickness and all manner of disease." Matthew 10:1
The cast of Unclean Hands - 2010 includes: Silvia Baldassini Joshua Delivuk
Evil spirits do exist.For we know that our battles are not with flesh and blood(human), but against principalities, rulers of darkness......ect.... Read Ephasians 6:12. But more powerful is He that is in us (Jesus Christ). A Christian can be able to see them, but in many cases we don't see them, but we can feel the satanic spirits around us. Yes they do exist, they are disembodied spirits, those who were cast out of heaven with Satan who became his angels. They may at times visit a person if they see that that person has taken upon himself the name of Christ, and are thought to be a threat to their cause. that of bringing all men over to the dark side.
Actually there are both good and evil spirits on earth.
The cast of Spirits - 2012 includes: Jim Nezbeth as Bruce
The cast of Spirits - 2015 includes: Cynthia Bravo as Selena
The cast of Determined Spirits - 2011 includes: Diana Rumjahn
The cast of Spirits - 2009 includes: James Fauvell Jeff Pucillo
The cast of Spirits - 1929 includes: Ernie Lotinga as Jimmy Josser
The cast of Friendly Spirits - 1935 includes: Ernest Truex
The soldiers cast lots to see who would keep Christ's tunic.
The cast of Spirits of the Carnival - 1996 includes: John Gaden as Narrator