This song calls to mind the tree upon which Mercy hung.
Jesus, Divine Mercy Himself died upon the cross that EVERY soul ever created by the Father is redeemed. He died a horrible death, horrible beyond all our possible imagination. Horrible beyond the flesh. He died upon that cross that His Sacred Heart may be open and the blood and water may wash us free of our sin, giving us life eternal.
All we need to do is accept His Divine Mercy in complete trust.
I can pretty much guarantee that when someday you are before the Savior, the first thing you will do is praise God for The Mercy Tree.