Lent: Five sermons of Pope St. Leo the Great

There are five extant sermons (of at least eleven) on Lent of Pope St. Leo I (the Great), who reigned from AD 440 - 461. I'd like to look at one during each of the first five weeks of Lent, and then use Holy Week to summarize and paint the big picture of Lent, as Pope St. Leo saw it. I expect to have the first sermon up here, with my commentary, on Wednesday.