Purgatory is the second part of Dante's The Divine Comedy: The listener finds the Poet, with his guide Virgil, ascending the terraces of the Mount of Purgatory inhabited by those doing penance to expiate their sins on earth. There are the proud - forced to circle their terrace for eons bent double in humility; the slothful running around crying out examples of zeal and sloth; while the lustful are purged by fire.