is about accepting loss as a constant in life

If you have read any of the grief and loss literature, you are reminded that your experience of loss started the day you moved from womb to breast, to bottle to glass. In fact, your childhood can be defined as a never-ending process of yearning for the familiar while eagerly opening up to the new. As you mature, however, your losses become more sobering and difficult to resolve.

Judith Viorst explains it well in her book, Necessary Losses, when she says…

[W]e lose not only through death but also by leaving and being left, by changing and letting go and moving on. And our losses include not only our separations and departures from those we love, but our conscious and
unconscious losses of romantic dreams, impossible expectations, illusions of freedom and power, illusions of safety and the loss of our own younger self.