What is Simon's importance to Lord of the Flies, and how is he presented? Please include quotes.

Simon serves as the potential moral savior and voice of
reason in Lord of the Flies. Although not as old as Ralph or Jack,
his leadership abilities are seen by Ralph early in the story; and, though not as
intelligent as Piggy, Simon is obviously bright and sound in his approach to the boys'
problems. He is the first to recognize that "the beast" is not really some supernatural
being, and he shows his courage by his willingness to make another trek to discover its
true origin. He finds it necessary to retreat into solitude in order to clear his head
and see things more clearly and, along with Piggy, he becomes a symbol of sacrifice when
the boys tear him to pieces during their blood-lust frenzy.