“The prospect of one’s own death, perhaps highlighted by a diagnosis of a dangerous or terminal condition, tends to focus the mind. But the deaths of others—relatives, friends, acquaintances, and sometimes even strangers—can also get a person thinking. Those deaths need not be recent. For example, one might be wandering around an old graveyard. On the tombstones are inscribed some details about the deceased—the dates they were born and died, and perhaps references to spouses, siblings, or children and grandchildren who mourned their loss. Those mourners are themselves now long dead. One thinks about the lives of those families—the beliefs and values, loves and losses, hopes and fears, strivings and failures—and one is struck that nothing of that remains. All has come to naught. One’s thoughts then turn to the present and one recognizes that in time, all those currently living—including oneself —will have gone the way of those now interred. Someday, somebody might stand at one’s grave and wonder about the person represented by the name on the tombstone, and might reflect on the fact that everything that person—you or I— once cared about has come to nothing. It is far more likely, however, that nobody will spare one even that brief thought after all those who knew one have also died.”