File photo of Pope Francis using incense as he celebrates Mass at Verano cemetery in Rome on feast of All Saints

Pope Francis uses incense to venerate a statue of Mary as he celebrates Mass at the Verano cemetery in Rome on the feast of All Saints in this Nov. 1, 2013, file photo. The pope is deeply devoted to Mary and often expresses his devotion by praying in front of Marian statues and then gently touching them. (CNS photo/Paul Haring) See VATICAN LETTER April 16, 2015.