Copying or enriching, that's the question

Dylan said concerning the “hoopla” about quotations from literature and songs that only “wussies and pussies” complain about that stuff. According to him quotation is an enriching tradition. I agree. However I cannot see how copying almost verbatim could be seen as enriching. In this mind map I made a comparison of Scarlet Town with the works of Whittier. Please note that there are many other quotations from differents authors and songs as well, e.g. “Little boy blue come blow your horn” is taken verbatim from the lullaby Little boy blue. Scarlet Town reminds me of Working Man’s blues when considered the number of quotations.