Well, guys I would like to share my personal experience with you.
I am brazilian, so please forgive my bad english.
About Ghosts/Bad spirits, all ancient religions has some beliefs/explanations. Many of them accept the concept that people can be possessed by evil/bad spirits.
My granpa passed away in 2002 but I am can testify you he performed exorcisms. It was not frequent, he was no priest but it happened. In such cases my granpa and other people from the church were called to help. When the bad spirit manifested in the person, he/she was able to speak of hidden things no one would know, tear its own clothes and eat dirt. Frequently the spirit would manifest while the 'exorcist group' were still on their way to the tormented house.
At the tormented place my granpa and colleagues would sing holy hymns, pray and read bible passages aloud. Most essentialy: only through the name of Jesus Christ the spirit would go away.
This is my personal experience. You can believe it or not but I must testity that the bad spirits would go away through the name of Jesus Christ.
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