26 As we all know, the Church is deeply rooted in the world. It exists in the world and draws its members from the world. It derives from it a wealth of human culture. It shares its vicissitudes and promotes its prosperity. But we also know that the modern world is in the grip of change and upheaval. It is undergoing developments which are having a profound influence on its outward way of life and habits of thought. The great advances made in science, technology, and social life, and the various currents of philosophical and political thought pervading modern society, are greatly influencing men's opinions and their spiritual and cultural pursuits.
Source: Ecclesiam Suam (Vatican.va)