I think this song is meant to guide a distraught person. She tells herself to be productive, by using the "hour" to create "something new", and then "throw away the flower", perhaps given by the one who hurt her, which makes her "blue". I think the chorus is trying to make the pessimistic distraught person be more optimistic. She makes herself the distraught person saying she is a "dark" cloud, or one that is full of sadness,etc. which is sung more sadly, but then says that the "dark cloud" is "swelling with rain"- rain is something that purifies and brings hope, therefore sung in a more cheerful manner.
I think this song is meant to guide a distraught person. She tells herself to be productive, by using the "hour" to create "something new", and then "throw away the flower", perhaps given by the one who hurt her, which makes her "blue". I think the chorus is trying to make the pessimistic distraught person be more optimistic. She makes herself the distraught person saying she is a "dark" cloud, or one that is full of sadness,etc. which is sung more sadly, but then says that the "dark cloud" is "swelling with rain"- rain is something that purifies and brings hope, therefore sung in a more cheerful manner.