Hyperbole is the rhetorical technique used by Swift in the provided statement to emphasize sincerity and absence of personal interest.
Hyperbole is a rhetorical technique that involves intentional exaggeration for effect. This technique is used when Swift states, 'I profess, in the sincerity of my heart, that I have not the least personal interest in endeavoring to promote this necessary work.' By denying any personal interest in a seemingly exaggerated manner, Swift is employing hyperbole to emphasize his sincerity and lack of selfish motives.
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