The youthful face of God's mercy can change the hearts of people who have lost hope, Pope Francis said.

Tara Gouldring never thought of herself as a missionary to others.

God chose to manifest his power not by amazing feats of greatness but rather through small acts of humility, choosing to enter the world as a child born of a woman, Pope Francis said.

Young people can show the world love through actions of caring and service to others in a world where even priests are not safe while celebrating Mass, said the president of Caritas Internationalis.

Poland's memory and identity are the two catalysts that will lead the country forward and turn hopeless situations — such as those facing migrants — into opportunities for future generations, Pope Francis said.

The world, not religion, is waging a war in pieces, Pope Francis said.

St. John Paul II's former secretary urged young Catholics to share their faith, experiences and hopes and spread a "message of divine mercy" worldwide during World Youth Day.

The head of the U.S. military archdiocese July 25 urged pilgrims on the way to World Youth Day to have "an ideal beyond" themselves and to be people "for others."

Polish police have raised the official security threat level at World Youth Day in Krakow, after an Iraqi man was arrested with traces of explosives.