This mentions the political development in the form of resistance to the beliefs upon Pope's influence in the lives of Christians that was resisted by the French. It shows how Roman Catholic Church was losing its power as a result of Protestant reformations.

I agree with the points made by Ssamo1 The Pope is trying hard to tell people to stick to the traditional Catholic practices and shun the reformatory ideas of Martin Luther. He is being religiously appealing for people of that time because he knew that those who have believed in Roman Catholicism and have been loyal to the Pope, Peter and the Church will listen to him and consider Martin Luther and his reformation as prime evil. These words work powerfully from religious as well as from the political perspective.