The phrase "To be or not to be" should be quoted because it is a phrase used in Hamlet's play.
The citation is a writing resource through which we can use the ideas of another author but we must give him credit as the creator of those ideas. Therefore, all the sentences that we obtain from other texts must be cited correctly to avoid plagiarism.
If we take ideas from other texts and include them in our texts we must cite them because it is the only way to give credit to their real author. In this case, the sentence "To be or not to be" was created by William Shakespeare in his play Hamlet so it must be quoted.
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