The whole concept of the Hunger Games is to keep people separate from one another, to discourage rebellion. Usually quotes are kept for your body paragraphs, however a quote can be used in the opening paragraph if it fits perfectly with your overall contention.
Quotes should always be surrounded by quotation marks. Show that you understand the essay question by re-writing it in your own words.
Clearly, The Hunger Games is much more than a science fiction adventure tale. It is clear to the reader that Katniss is slowly learning to accept her emotional side as a strength, but because she is narrating the story in present tense, she isn't always able to recognize that in herself.
Another topic sentence linking back to the essay topic.
She learns to accept community as a source of strength throughout the novel, though her primary stated goal remains survival. Propaganda is used throughout the book to control the citizens of society.
When they get killed. After being named tribute but before going to the arena, she is confronted both with her guilt at not helping the Avox, and with Peeta's "purity" of wanting to stay himself until death despite the barbaric pressures of the arena.
You could always use a quote in your introduction. The reader should know just from the introduction what your point of view is, and where the essay will be heading.
By separating the Districts from one another along strict lines of wealth, and then encouraging class resentment through tesserae, the Capitol keeps citizens distrustful of one another so that they will not turn their eyes collectively towards their true oppressor.
Try to avoid repeating yourself.