After spending many long and lonely hours listening to this, I've decided that it's the sound of loving someone so much that it hurts. And refusing to allow that person close enough to love you as deeply as you love them, because a love that strong means sadness just as intense. Sadness of knowing that it can never last forever in this lifetime, and not knowing (or disbelieving) that it could continue in another. Though I do agree with another commenter that these lyrics are not quite right, and make for convoluted interpretations.
After spending many long and lonely hours listening to this, I've decided that it's the sound of loving someone so much that it hurts. And refusing to allow that person close enough to love you as deeply as you love them, because a love that strong means sadness just as intense. Sadness of knowing that it can never last forever in this lifetime, and not knowing (or disbelieving) that it could continue in another. Though I do agree with another commenter that these lyrics are not quite right, and make for convoluted interpretations.