By Phil Lawler, Catholic Culture - While we celebrate the certainty and unity that the See of Peter has brought to our faith over the centuries, the past decade has forced Catholics to question the nature of papal authority. When does a Pope teach with magisterial authority? When is he speaking for himself, and when does he represent Peter, the rock on whom the Lord built his Church?... These questions are tackled in a new book: "Super Hanc Petram: The Pope and the Church at a Dramatic Moment in History", by Father Serafino Lanzetta ....