Religion is a great way to solve these kinds of problems, I'm a muslim, and us kinds believe in ghosts/spirits and whatnot, and we use these Arabic sentences to stop a demon/ghost/spirit from coming near you. I know it sounds like bullshit but it makes you truly believe that the spirit is gone if you believe in it. I believe that these spirits don't really exist but because we think that there's a possibility that they do, we mistake things with spirits. If you don't believe in them or have never heard of spirits (lol), I'm pretty sure that you wont see them.
(Damn my Engrish, took me like 15 minutes to type that small wall of text)

