A balanced sentence gives rhythmical flow to the text. It draws attention of the readers to the sentence and makes it stand out among the rest. Writers use balanced sentences to emphasize particular ideas to make meanings clear, as well as to create pleasing rhythms. In fact, it puts a spotlight on a series of clauses or a sentence. Hence, it helps the writers to make their work stand out from the rest of the text. On the other hand, public speakers, singers, and advertising agencies use it, because its rhythmical qualities have a good impact on the audience .
By using even a brief personal story, Mead is helping her readers relate to her and open to her viewpoint. Her mentors and teachers instilled in her a sense of purpose — an urgent one, at that — to study human behavior as it happens naturally in a variety of societies and cultures. We can all relate to the feeling of longing for a sense of purpose, even though we may not have an interest in anthropology specifically. Most of us will nod knowingly at her decision because we understand that when one finds a sense of purpose, the will to make it happen follows strongly.