Retired Pope Benedict XVI said dialogue with other religions is no substitute for spreading the Gospel to non-Christian cultures.
Among the men's vows is the promise to obey their superior, "serving where the church sends the priest, not where he wishes to serve."
They say you can feast like a king, and now you can eat like a pope after a young chef from the Vatican's Swiss Guards published a cookbook featuring the favorite recipes of Pope Francis and his predecessors.
David Geisser, 24, who joined the elite Vatican security corps only a month ago, released his book, Buon Appetito, in Rome on Tuesday.
All wars begin in the human heart -- a heart that is jealous and bitter and tears apart communities through misunderstandings and marginalization, Pope Francis said.
The Middle East, especially Iraq and Syria, are experiencing "terrorism of previously unimaginable proportions" in which the perpetrators seem to have absolutely no regard for the value of human life, Pope Francis said.
"It seems that the awareness of the value of human life has been lost; it seems that the person does not count and can be sacrificed to other interests. And all of this, unfortunately, with the indifference of many," he said during a special meeting at the Vatican on the Middle East.
Pope Francis praised Blessed Paul VI as a "humble and prophetic witness of love for Christ and his church" at Paul's beatification Mass on Sunday.
As the Synod of Bishops on the family's final report narrowed its tone of openness, Pope Francis called on bishops Saturday to find a path between doctrine and reality.
In a message to families, the Synod of Bishops outlines a situation of "light and shadow" around the world and says married love "shines out brightly, warming bodies and souls."
Q and A: Archbishop Joseph Kurtz says the synod on the family is starting a process of discernment among the church's prelates.
"Saying that the doctrine will never change is a restrictive view of things. ... The core of the Catholic church remains the Gospel, but have we discovered everything?"