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As not every instance of similitude can be considered as a proof of imitation, so not every imitation ought to be stigmatised as plagiarism. The adoption of a noble sentiment, or the insertion of a borrowed ornament, may sometimes display so much judgment as will almost compensate for invention; and an inferior genius may, without any imputation of servility, pursue the paths of the ancients, provided he declines to tread in their footsteps.

Samuel Johnson (1782). “The Beauties of Johnson: Consisting of Maxims and Observations, Moral, Critical, and Miscellaneous”, p.117
As not every instance of similitude can be considered as a proof of imitation, so not every imitation ought to be stigmatised as plagiarism. The adoption of a noble sentiment, or the insertion of a borrowed ornament,