"In the homily, the pope focused especially on a phrase from the second Letter to the Corinthians: "We implore you on behalf of Christ, be reconciled to God." (5:20). " Paul," he commented, "experienced in an extraordinary manner the power of God's grace, the grace of the Paschal mystery that is the vital force of Lent itself. He presents himself to us as an 'ambassador' of the Lord. Who better than him, then, to help us travel in a fruitful way this path of interior conversion?"Pope Benedict XVI
Here is a symposium on Lent at NRO Online.