As Catholics, I think we’re often in danger of putting ourselves in a bubble. The thing that strikes me most in Gaudium et Spes is the implicit idea that we’re supposed to be in the world, not isolated from it. It seems so obvious. Of course–how can we leaven the world if we don’t interact with it?
But another danger of the bubble is that we develop a combative, competitive view of ourselves vs. the world. THE WORLD is bad, nothing good can possibly come of it, all secular movements are inherently contrary to the Gospel, etc. We do this all the time.
Here, the bishops and Pope Paul VI urge the faithful to remember that even when the world doesn’t get it all right, the heart is often in the right place. To me, the lesson is: Rather than battling everything that comes out of the secular realm, we should look for what is of value, and find how to work in cooperation for the betterment of all. To me, that seems the best chance for true evangelization.