“It’s Quiet Uptown” is one of several powerful songs in Lin-Manuel Miranda’s musical Hamilton. The lyrics include the observation:   “There are moments that the words don’t reachThere’s a grace too powerful to nameWe push away what we can never understandWe push away the unimaginable.” In all lives, a number of profound happenings, some good, some bad, can’t be properly explained or anticipated before they happen. Among them are the loss of a loved one, marriage and the birth of a child.   Retirement, the formal ending of ties and habits that one has followed for years, is another juncture that can…