(Wrong category) Anyway the song is pretty straight forward. It's about this relationship he has with a girl but he knows that the relationship is so beautiful that it won't last... like the light of a firefly. Fireflies don't shine all the time... they only flash at night. He says that he knows just like how the seasons change so does the relationship. He knows wherever he or she goes they won't last because what they have is so beautiful. They don't want to say goodbye but it's inevitable. A young love has a certain innocents to it and the couple thinks it will last forever. Hope it helps.... I absolutely love this song.