Grief comes sometimes

Grief comes sometimes as an eagle, fierce of eye,
captive in a cage too small.
And inside, I can feel those great wings,
beating against my ribs.

Or sometimes as a turtledove,
held within my heart,
whose fluttering wings
shake my very soul.

Beloved, when I think of you,
grief comes sometimes as a bird
and I wonder where I have left the key
that will set this captive free.