rags of heart (be not unite)

[… ] what did become
  Of my heart when I first saw thee?
I brought a heart into the room,
  But from the room I carried none with me.         
If it had gone to thee, I know
Mine would have taught thine heart to show
  More pity unto me; but Love, alas!
  At one first blow did shiver it as glass.

Yet nothing can to nothing fall,
  Nor any place be empty quite;
Therefore I think my breast hath all
  Those pieces still, though they be not unite;
And now, as broken glasses show
A hundred lesser faces, so        
  My rags of heart can like, wish, and adore,
  But after one such love, can love no more.

from “The Broken Heart,” John Donne