Pope Francis waves from the pope-mobile during his inauguration Mass at St. Peter's Square on Tuesday (March 19) at the Vatican. World leaders flew in for Pope Francis' inauguration Mass in St. Peter's Square on Tuesday where Latin America's first pontiff will receive the formal symbols of papal power. RNS photo by Andrea Sabbadini
VATICAN CITY (RNS) Pope Benedict XVI had almost finished "Lumen Fidei" when he resigned on Feb. 28. Pope Francis took up the unfinished work, adding a “few contributions” and published it under his own name.