Pope Francis greets faithfulat the end of the Palm Sunday Mass in St. Peter's square at the Vatican, Sunday, April 13, 2014. Tens of thousands of Romans, tourists and pilgrims have joined Pope Francis in a solemn Palm Sunday service in St. Peter's Square. Palm Sunday begins Holy Week, which culminates next Sunday on Easter. Francis used a pastoral staff made of wood carved by Italian prison inmates, who donated it to him. The pope is determined to put people on the margins of life at the center of the Roman Catholic church's attention. (AP Photo/Riccardo De Luca)