While it is true that there is nothing new under the sun, as King Solomon once said, it is also true that intertexuality arises out of repetition and plays a healthy role in our understanding of any text; because similarities and repetitions are inevitable conceptually, every connotation we bring to the text helps us better understand it. The world of literature is essentially a massive, intricate web of concept, weaved by authors ranging from century to century. For example, O Brother Where Art Thou is merely a watered down, comical version The Odyssey set in 17th century America. The two works are ages apart and culturally distant, but they still have the same themes and the same plot. Communally, they correlate two cultures perhaps uncorrelated for the audience. Intertextuality helps us become universal creatures, and enhances our comprehension of the world. it helps us relate to ancient cultures, as well as humanity as a whole.
In addition, because we all bring different perspectives to texts we read, what may be repeated for one reader may not be repeated for another. Therefore, everyone who reads the same novel or watches the same movie will have a different perspective, depending on previous knowledge and outside connotations.
A repeated idea, a theme, or a concept is not nessacarily negative. In fact, it brings us together, culture to culture, age to age. Through literature, humanity comes to a consensus. It is our way of communicating to each other idealistically in spite of differences such as time and circumstance.