Final answer:
The literary device in the quote is allusion, referencing Cupid, the Roman god of love, to suggest extraordinary feats in love.
Step-by-step explanation:
The literary device present in the quote "You are a lover. Borrow Cupid’s wings and soar with them above a common bound.” is allusion. An allusion is a direct or indirect reference to a well-known person, place, event, literary work, or work of art, often used to convey complex ideas in a few words.
In this instance, the reference to Cupid’s wings alludes to the Roman god of love, Cupid, suggesting that the lover can achieve extraordinary feats of romantic or emotional significance, just as Cupid flies and inspires love. This use of allusion enhances the meaning by evoking the power and symbolism associated with Cupid.
It does not fit the definition of hyperbole as it's not an exaggerated statement, neither is it anaphora since it does not repeat a sequence of words at the beginnings of neighboring clauses, nor does it fit into alliteration, which requires the repetition of the same letter at the beginning of adjacent or closely connected words.