"If you prick us, do we not bleed? If you tickle us, do we not laugh? If you poison us, do we not die? And if you wrong us, shall we not revenge?" - The Merchant of Venice (By William Shakespeare)
Saying the same word or phrase more than once for emphasis
Tells the reader or audience that the words being used are central enough to be repeated, and lets them know when to pay special attention to the language