Pope Francis has outlined a mission statement for his papacy, arguing the power of the Catholic Church is too concentrated in the Vatican.
Since becoming Pope in March, Francis has struck a markedly different tone to his predecessor on several issues.
in the first major work he has written in the role, Pope Francis said he preferred a Church that was "bruised, hurting and dirty because it has been out on the streets, rather than a Church which is unhealthy from being confined and from clinging to its own security".
The document suggests major changes are on the way, with Francis noting that the Church has to get over an attitude that says "We have always done it this way".
A BBC correspondent says it represents an ambitious programme to try to rekindle the church's missionary zeal.
Last month Pope Francis held his first meeting with a special group of cardinals to consider ways to reform the Vatican bureaucracy after saying in a newspaper interview that the Vatican had become too self-interested and needed to be inclusive.
"Excessive centralisation, rather than proving helpful, complicates the Church's life and her missionary outreach," he says in the latest document.
He also says he does not believe that the papacy "should be expected to offer a definitive or complete word on every question which affects the Church and the world".
Other issues
The BBC reports the document also touches on inter-faith relations, urging Christians to "embrace with affection and respect Muslim immigrants to our countries in the same way that we hope and ask to be received and respected in countries of Islamic tradition".
The document also restates the Church's opposition to abortion but concedes that "it is also true that we have done little to adequately accompany women in very difficult situations, ... especially when the life developing within them is the result of rape or a situation of extreme poverty".
"Who can remain unmoved before such painful situations?" he asks.
Pope Francis also expands on his concerns about economic inequality.
"Today we also have to say "thou shalt not" to an economy of exclusion and inequality. Such an economy kills," he says, going on to castigate the "new idolatry of money".
"I beg the Lord to grant us more politicians who are genuinely disturbed by the state of society, the people, the lives of the poor!" he goes on.