Question

Why this refrain used in the poem?

Answer 1

$\huge\underline\mathfrak\green{ANSWER}$

Refrains are usually repetitions of a single word or phrase, even an entire stanza, for the sake of asserting its importance while enhancing the meter or rhythm of the literary work itself. When an author really wants you to pay attention to a certain point or set of words, he/she will use a refrain to make it obvious.