In chapter 5, Ralph brings up the existence of the beast at the assembly. Ralph begins by saying that there is absolutely no possible way a beast inhabits the island and Jack agrees with his statement. Piggy also agrees that there is no beast on the island and looks at the situation pragmatically. Piggy believes that "life is scientific" and does not think that it is possible for a massive beast to exist on such a small tropical island. However, Simon understands the true nature of the beast but cannot articulate his thoughts during the assembly because of his fear of public speaking. Simon is a symbolic Christ figure throughout the novel and thoroughly understands that the beast is the inherent wickedness present in each boy.
At the beginning of chapter 6, Samneric claim that they witnessed the beast on the top of the mountain. All of the boys, except Simon, believe Samneric's story and form a hunting party to search for the beast. As the boys explore the island looking for the beast, Simon experiences a feeling of disbelief. Golding writes,
However Simon thought of the beast, there rose before his inward sight the picture of a human at once heroic and sick (79).
Simon's unique insight into the true nature of the beast prevents him from believing that there is a malevolent physical creature on the island. Simon is the only boy not scared of the beast because he understands that it is the inherent wickedness of each boy.