13 One part of this world, as everyone knows, has in recent years detached itself and broken away from the Christian foundations of its culture, although formerly it had been so imbued with Christianity and had drawn from it such strength and vigor that the people of these nations in many cases owe to Christianity all that is best in their own tradition-a fact that is not always fully appreciated. Another and larger part of the world covers the vast territories of the so-called emerging nations. Taken as a whole, it is a world which offers to the Church not one but a hundred forms of possible contacts, some of which are open and easy, others difficult and problematic, and many, unfortunately, wholly unfavorable to friendly dialogue.
Source: Ecclesiam Suam (Vatican.va)