The chorus in the Greek tragedy represents the old men of Thebes. They react and comment on the action through singing and dancing between scenes. They provide opinions and speak for the common people. Hybris refers to excessive pride that leads to foolish acts, including physical or verbal assaults that cause shame. Oracles allowed Greeks to consult the gods' will through holy sites and chosen intermediaries. Pollution resulted from acts like murder and incest that violated laws, requiring ritual cleansing for individuals, locations, and anyone associated with the offender to restore order. Catharsis described the purging of strong emotions experienced while watching tragedy, providing a cleansing effect.