In a letter to Chicago’s young people, Pope Francis says to follow the example of Martin Luther King Jr.

Then the pope asked: “What is the cross for you? Yes, it is the Christian symbol. We make the sign of the cross, but often we do not do it well.”

"The devil always comes in through the pocket, always," the pope said.

The Vatican welcomed the refugee families after an appeal made by Pope Francis on every parish, religious community, monastery and shrine in Europe to take in a family of refugees.

The pope told the participants that his first reaction to hearing about "this praiseworthy initiative" was one of gratitude to God.