God does not exist, as neither does our hereafter, that second bogey being as easily disposed of as the first. Indeed, imagine yourself just dead—and suddenly wide awake in Paradise where, wreathed in smiles, your dear dead welcome you. Now tell me, please, what guarantee do you possess that those beloved ghosts are genuine; that it is really your dear dead mother and not some petty demon mystifying you, masked as your mother and impersonating her with consummate art and naturalness? There is the rub, there is the horror; the more so as the acting will go on and on, endlessly; never, never, never, never, never will your soul in that other world be quite sure that the sweet gentle spirits crowding about it are not fiends in disguise, and forever, and forever, and forever shall your soul remain in doubt, expecting every moment some awful change, some diabolical sneer to disfigure the dear face bending over you.
Vladimir Nabokov, Despair
afterlife, atheism, god, heaven