The Lord of the Flies also called Beelzebub is one of the manifestations of the devil - So what is the ancient inescapable recognition?

The Wording of this question indicated that you have already made up your mind that the ancient inescapable recognition is that Simon detected that the presence of Devil was at the root of the problems. However Simon was an epileptic who was on the verge of having a major epileptic episode and he was also intelligent enough to have previously sugested that the beast, 'might be just us.' So the inescapable recognition could be either that he is aware that he about to have a major epileptic fuge or he recognised the certainty that the evil was indeed internal and was truly an intergral part of ourselves.