What are quotes from Lord of the Flies that show no matter what-- humans never change-- and how do these quotes relate back to the theme(s) in the...

One of the most telling moments in the novel is when Simon
encounters the Lord of the Flies.  Amidst all of the mockery and condescension from the
pig's head, Golding utilizes the decay and evil of the Lord of the Flies to reinforce
one of the most dominant themes of the novel--man's innate capacity for
evil:

"'Fancy
thinking the Beast was something you could hunt and kill!' said the head. [...] 'You
knew, didn't you? I'm part of you? Close, close, close! I'm the reason why it's no go?
Why things are what they are?'"
(143).

Even though the
severed head instructs Simon to forget the whole thing, the reader cannot forget; the
destructive force mentioned by the Lord of the Flies manifests itself in the boys' own
destructive actions, from the scar left on the island to the killing of the pigs, to the
eventual murder of Simon and Piggy.  The Lord of the Flies is a visual metaphor for
man's own capability for destruction, a theme which resonates throughout the whole of
the novel.