The pope's emphasis on protecting undocumented workers is particularly significant for Europe and the United States, where the treatment of refugees and migrants has been a consistent challenge.

Pope Francis said that European countries must not only welcome migrants but integrate them into society.

“The grave danger," Pope Francis writes, "is to disown our neighbors. When we do so, we deny their humanity and our own humanity...and we deny the most important Commandments of Jesus.”

Pope Francis: “war begins in the heart of a person; it begins at home, in the family, among friends and then goes out into the whole world.”

"For governments, this means recognizing that indigenous communities are a part of the population to be appreciated and consulted, and whose full participation should be promoted at the local and national level."

An appearance at the Vatican is often used by supporters to signal papal support for an individual or a cause, but the reality is far more complex.