I have too many to name one.
I even tried. I sat here and went through my brain and all the files therein and thought, "Nope. Just too many." Yet, I can say that While I'm Waiting and Strong Enough are two songs that have spoken directly to my heart in a time of pain/growth and brought tears to my eyes.
<span class="gmw_">[video=youtube;i6X71sXagUY]http://www.youtube.com/watch?v=i6X71sXagUY[/video]