Rocks and Hearts

Have you ever stood in a flowing river,
Looked down and saw a rock you wanted,
Picked it up and loved the way it felt,
The way it fit in the palm of your hand?
Maybe you slipped it into your pocket,
Called it your special, lucky rock.
You got used to the feel of it.
Then one day you realized it wasn't there.
You did not know where or when you lost it. 
That happens with hearts in the river of life.
There can be one you wanted and got,
One that was a plus in your life.
You took for granted that it was yours
Until one day you realized it was gone.
A heart is a lot different than a rock.
If you find that rock it's still yours,
Even if you know where you lost that heart,
Though it fit you like no other ever had,
There's no gaurantee that heart will be yours.