English Essay Need Help?

In "The Rime of the Ancient Mariner", The Polar Spirit's fellow demons describe him as follows; "the spirit who bideth by himself/in the land of mist and snow,/he loved the bird that loved the man/who shot him with his bow. Write an essay yzing the role these lines play in the poem. Why are these lines important to the plot? What poetic effects does Coleridge use in these lines? What tone is created by the poetic effects?