The sixth circle contains the Heretics, those who believed that the body did not contain a soul. Many of these are Epicureans, followers of Epicurus, the Greek philosopher whose philosophy was the attainment of happiness, defined as the absence of pain.
Farinata, along with Cavalcante, is in the circle of the Heretics, partly because both he and Cavalcante were Epicureans. According to Dante's society, a heretic was a person who chose his or her own opinion rather than following the judgment of the papacy; Cavalcante and Farinata followed the Epicurean philosophy. The Epicureans believed that there is no soul and that everything dies with the body. They regarded the pleasures of life on Earth as the highest goal for man. Because Dante knew both Farinata and Cavalcante as Epicureans, he fully expected to meet them in this circle of Hell.
According to Dante's idea of retribution, the Heretics' punishment is to spend eternity in flaming tombs, until Judgment day, when the tombs will close and the souls inside will be sealed forever within their earthly bodies.
Dante consistently uses the act of prophesy as a literary device in Inferno. Farinata's prophesy for Dante, "the face of her who reigns in Hell shall not/be fifty times rekindled in its course/before you learn what griefs attend that art," means that Dante will also experience the grief of exile.
The other shade that interrupts Farinata is Cavalcante, another Epicurean, former citizen of Florence, and father of Guido, a contemporary poet and friend of Dante's. When Dante says: "Your Guido felt disdain," he could mean several things. He could mean that Guido, a modern poet, held Virgil and all classical poets in scorn. Note that Farinata and Cavalcante don't notice or recognize each other. Shades in Hell are not there for each other's companionship or compassion. They don't keep one another company, and they are more often together to provide more suffering for one another, as in the case of Ugolino and Ruggieri in Canto XXXIII, whose position next to each other for eternity causes pain rather than comfort.
