You Never Know What You Have Lost

You never know what you've lost,
until it slips away.
It's gone from your reach,
and gets farther everyday.
You don't know what to say,
you've got tears in your eyes,
and you end up sitting there,
just wondering why.
It hurts knowing it's gone,
and there's nothing you can do,
if you only knew how special it was,
if you only had a clue.
But you've got to let it go,
because you cant dwell in the past.
Its useless trying to retrieve something,
you know will never come back.