All the songs are pieces to the puzzle. They each represent something different. So it's really difficult to say one song represents the album.
Imagine any problem you have to be a huge, locked door standing in front of you. Now see yourself taking a golden key out of your pocket. You brought the key here with you when you arrived on this planet, but you sometimes forget to use it. See yourself putting it into the keyhole, then watch the door swing open. On the key are inscribed these words, "Unconditional Love. "