This final stanza in Dana Gioia's poem "The Lost Garden" really spoke to me this morning. What a beautiful lyric.
The trick is making memory a blessing,
To learn by loss the cool subtraction of desire,
Of wanting nothing more than what has been,
To know the past forever lost, yet seeing
Behind the wall a garden still in blossom.
(From his collection Interrogations at Noon, Graywolf Press, 2001.)