3. "Third, there are bright, happy spirits of dead friends and family, especially spouses, who appear unbidden, at God's will, not ours, with messages of hope and love. They seem to come from Heaven. Unlike the purgatorial ghosts who come back primarily for their own sakes, these bright spirits come back for the sake of us the living, to tell us all is well. They are aped by evil spirits who say the same, who speak 'peace, peace, when there is no peace'. But the deception works only one way: the fake can deceive by appearing genuine, but the genuine never deceives by appearing fake. Heavenly spirits always convince us that they are genuinely good. Even the bright spirits appear ghostlike to us because a ghost of any type is one whose substance does not belong in or come from this world. In Heaven these spirits are not ghosts but real, solid and substantial because they are at home there: One can't be a ghost in one's own country."
“That there are all three kinds of ghosts is enormously likely. Even taking into account our penchant to deceive and be deceived, our credulity and fakery, there remain so many trustworthy accounts of all three types of ghosts - trustworthy by every ordinary empirical and psychological standard - that only a dogmatic prejudice against them could prevent us from believing they exist. As Chesterton says, 'We believe an old apple woman when she says she ate an apple; but when she says she saw a ghost, we say 'But she's only an old apple woman.' A most undemocratic and unscientific prejudice."
Reference:
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