By Russell Shaw, Catholic World Report - The speaker is the Roman poet Virgil, Dante’s companion and guide in scaling the lofty mountain of Purgatory in the second book of Dante’s tour-de-force account of the afterlife, The Divine Comedy. They’ve already paid a harrowing visit to the Inferno. Now it’s the turn of Purgatorio, where souls who need purifying are cleansed from of the stain of sin. After that–heaven... Note the neat bit of catechesis (one of many) that Dante, via Virgil, slips in casually: The great mountain of Purgatory–which the souls must climb–gets easier the higher they go.