The only use of first person in the poem draws attention to personal experience. Voice of the speaker is like a teacher telling us a moral lesson. The tone suggests instruction and builds to moral ...

Tis not through envy of thy happy lot, But being too happy in thine happiness - That thou, light-winged Dryad of the trees, In some melodious plot ...

But if you do write about a poem and its context, be careful to include only details that reveal something about the poem. Mary Lamb wrote stories and poems, often for children Mary Lamb was born ...