What did the beast mean, "i'm part of you?... im the reason why it's no go?"
When Simon meets with the lord of the flies, the beast says... "you knew, didn't you? I'm part of you. close, close, close! I'm the reason why it's no go. Why the things are the way they are."
Simon is the only one that recognized that the beast wasn't some physical being prowling around the island; the beast was inside of each of them. It is that "beast" inside that caused the ruination of their island society and the breaking up of any civilized behavior. Obviously, that beast was stronger inside characters like Jack and Roger than it was in the other boys, but Golding suggests that the beast does live inside all of us.
Of course, in a great use of irony, as Simon is attempting to tell the other boys what he knows about this beast, he is killed by a tribe that thinks he is the beast.
The topic of the 'beastie' character is commonly brought up in 'Lord of the Flies'. It has been a topic amongst the littluns ever since the beginning in chapter 2.
It only seems to then become a big deal when the littluns start having nightmares about it and start making up accusations about it living in the water.
Throughout the novel the 'beastie' character gives the boys' fear something to all focus on.
But however Simon seems to be the only adult one by saying that 'It could just be us'...
When the sows head (the lord of the flies) talks to simon and says these specific words it is relating to Golding's point saying that the Beast just exists within us and without civilised values its the reason why everything goes so wrong on the Island.
Going back to my point above it proves that Simon is right all along and even though he is only young he is still a very intelligent little boy.