The use of the phrase; "early diatribe about animal rights" in the philosophy assignment would not be plagiarism.
What is plagiarism?
Plagiarism is it's most primitive description is presenting another individual or group's work or ideas as one's own, with or without their consent, by incorporating it into one's work without full acknowledgement.
The above definition however includes not only published materials, but unpublished materials too.
However, in this scenario, only the phrase is used and not the English literature instructors idea.
Hence, it follows that the use of the phrase is not termed plagiarism as the phrase is the student does not state the author's idea about William Blake's "Auguries of Innocence".
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