The Invention of Morel by Adolfo Bioy Casares

Now I understand why novelists write about ghosts that weep and wail. The dead remain in the midst of the living. It is hard for them, after all, to change their habits—to give up smoking, or the prestige of being great lovers. I was horrified by the thought that I was invisible; horrified that Faustine, who was so close to me, actually might be on another planet (the sound of her name made me sad); but I am dead, I am out of reach, I thought; and I shall see Faustine, I shall see her go away, but my gestures, my pleas, my efforts will have no effect on her. And I knew that those horrible solutions were nothing but frustrated hopes.