What are Simon's reaction to and vision of the beast?

Simon and the beast are explored in a few chapters. In chapter 6, Simon has trouble reconciling the beast as a monster. Simon sees the beast for what it is: a manifestation of the boys' own evil within.

'Maybe there is a beast....maybe it's only us."

“However Simon thought of the beast, there rose before his inward sight the picture of a human at once heroic and sick.”