Pope Francis speaks to journalists during a press conference on the plane after his visit to Krakow for the World Youth Days, on July 31, 2016. Pope Francis celebrated mass on July 31, 2016 with over 1.5 million pilgrims in a vast sun-drenched field in Poland, wrapping up an emotionally charged trip with some choice technological metaphors. In a nod to today's internet-dominated world, Francis urged the faithful, who had travelled to Poland from all over the world, to "download the best link of all, that of a heart which sees and transmits goodness without growing weary". / AFP PHOTO / POOL AND AFP PHOTO / Filippo MONTEFORTEFILIPPO MONTEFORTE/AFP/Getty Images

Pope Francis speaks to journalists during a press conference on the plane after his visit to Krakow for the World Youth Days, on July 31, 2016. Pope Francis celebrated mass on July 31, 2016 with over 1.5 million pilgrims in a vast sun-drenched field in Poland, wrapping up an emotionally charged trip with some choice technological metaphors. In a nod to today's internet-dominated world, Francis urged the faithful, who had travelled to Poland from all over the world, to "download the best link of all, that of a heart which sees and transmits goodness without growing weary". / AFP PHOTO / POOL / Filippo MONTEFORTEFILIPPO MONTEFORTE/AFP/Getty Images

Pope Francis waves as he boards the plane after his visit in Krakow at the World Youth Days, July 31, 2016. Pope Francis celebrated mass Sunday with over 1.5 million pilgrims in a vast sun-drenched field in Poland, wrapping up an emotionally charged trip with some choice technological metaphors. / AFP PHOTO / WOJTEK RADWANSKIWOJTEK RADWANSKI/AFP/Getty Images

Pope Francis waves as he boards the plane after his visit in Krakow at the World Youth Days, July 31, 2016. Pope Francis celebrated mass Sunday with over 1.5 million pilgrims in a vast sun-drenched field in Poland, wrapping up an emotionally charged trip with some choice technological metaphors. / AFP PHOTO / WOJTEK RADWANSKIWOJTEK RADWANSKI/AFP/Getty Images

Pope Francis boards the plane after his visit in Krakow at the World Youth Days, July 31, 2016. Pope Francis celebrated mass Sunday with over 1.5 million pilgrims in a vast sun-drenched field in Poland, wrapping up an emotionally charged trip with some choice technological metaphors. / AFP PHOTO / WOJTEK RADWANSKIWOJTEK RADWANSKI/AFP/Getty Images

Pope Francis waves as he boards the plane after his visit in Krakow at the World Youth Days, July 31, 2016. Pope Francis celebrated mass Sunday with over 1.5 million pilgrims in a vast sun-drenched field in Poland, wrapping up an emotionally charged trip with some choice technological metaphors. / AFP PHOTO / WOJTEK RADWANSKIWOJTEK RADWANSKI/AFP/Getty Images

(FILES) This file photo taken on June 12, 2014 shows Russian President Vladimir Putin (L) walking with Russian writer Fazil Iskander (R) during the ceremony of handing out the 2013 Russian Federation National Awards for achievements in science and technology, literature and art as well as humanitarian activity at the Kremlin in Moscow. Soviet writer Fazil Iskander, whose works are known for their humourous descriptions of daily life in the Caucasus and satirical take on society under Communism, died on on July 31, 2016 aged 87. / AFP PHOTO / POOL / MAXIM SHIPENKOVMAXIM SHIPENKOV/AFP/Getty Images

This handout picture released by L'Osservatore Romano shows Pope Francis (L) arriving with the popemobile for a blessing ceremony of new houses for the poor and elderly built by Catholic charity Caritas, at Campus Misericordiae on July 31, 2016 in Brzegi as part of the World Youth Days (WYD). Pope Francis celebrated mass on July 31, 2016 with over 1,5 million pilgrims in a vast sun-drenched field, wrapping up an emotionally charged trip to Poland with some choice technological metaphors. In a nod to today's internet-dominated world, Francis urged the congregation, who had travelled to Poland from all over the world, to "download the best link of all, that of a heart which sees and transmits goodness without growing weary". / AFP PHOTO / OSSERVATORE ROMANO / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / OSSERVATORE ROMANO / HANDOUT" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HANDOUT/AFP/Getty Images