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I knew a priest who spent a lot of time in big cities. He said that when he would walk down the sidewalk in Manhattan there were a lot of people walking both ways, so he would be in a large crowd. But every so often he would get a feeling about someone who was walking nearby. He said that he could feel the evil that surrounds some, it's a feeling that cannot be ignored because it fairly demands attention.
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And this would be regarding someone he had never met and does not recognize, but it was the spirit of the person that was recognizable -- he was well acquainted with that spirit, and it was as if the wicked spirit could not contain himself for whatever reason. The priest could not say what it was precisely, but he had thought that the wicked spirit knew there was a priest nearby and therefore projected some kind of malevolent aura which some priests could sense, but not all priests. He said I should not think of it as a gift or a talent or some kind of holiness, but rather it is more of a curse.
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He tried to use this sense for the good, but sometimes it was rather taxing because in Manhattan there are a lot of people in public that give off this impression of presence so just a routine walk down the street for this priest could become a taxing ordeal.
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He wasn't talking about seeing a "ghost" but he WAS talking about feeling the effect of a ghost's presence.
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