What is this device of using quotes to imply that a character represents or symbolizes someone else?

In the movie Prometheus, David 8 quotes a passage from "Paradise Lost" said by Lucifer. He tells Walter,

So in the film Prometheus we see that David symbolizes evil, or the devil Lucifer.

What is this device of using quotes from books to tell the readers or viewers that a certain character represent or symbolize someone?

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What is this device of using quotes to imply that a character represents or symbolizes someone else?

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