balance between man and natur in wordsworth's poetry

Hi, I'm Viviana, from Italy.
I'm prepearing my high-school graduation thesis and the central theme is Balance between man and nature. I had to choose an english argument to put in it and I thought to use the poem "my heart leaps up when I behold a rainbow in the sky"; But I have however to make a big and interesting introduction about the main theme (before explaing the poem).

Do you have any information that could help me?
Thank you so much for your time!