We are repeatedly left, in other words, with no further focus than ourselves, a source from which self-pity naturally flows. Each time this happens I am struck again by the permanent impassibility of the divide. Some people who have lost a husband or a wife report feeling that person’s presence, receiving that person’s advice. Some report actual sightings, what Freud described in “Mourning and Melancholia” as “a clinging to the object through the medium of a hallucinatory wishful psychosis.” Others describe not a visible apparition but just a “very strongly felt presence.”