Hello.
One literary device, which is more often associated as a philosophical device, is the dialectic<span>. This involves the discussion of a concept and its opposite. Another way of thinking of it is that dialectic involves a contradiction (X and its opposite) and a possible solution, balance, or synthesis (combination of X and its opposite)
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That footnote can play a large role in helping Karim better understand the myth, because instead of just listing the source, it gives a bit of history about the subject.