"The Secret" by Denise Levertov

I thought that "The Secret" by Denise Levertov was very unique and maybe just a bit confusing to read but i guess that's part of the poem or else it wouldnt be called "the Secret." i believe that there is a hidden message in the poem that im not following because it seems like i cant figure out what is going on. I do know that it is about two girls finding a secret in a poem, but they lost the poem, therefore they lost the secret and may even forget about the secret later on so they wont be able to tell others what the secret was.