The Contrapasso in Inferno vs. corrective punishment in Purgatorio.  The proud bent down, the envious blinded.  Sapia's guess that Dante can see: but she's not envious of him for it.  Virgil's exposition of love at the very center of the Divine Comedy in Purgatorio 17.  T.S. Eliot's Dantesque imitation in Little Gidding.