5 It is only too plain how many and of what nature are the corrupting agencies by which the wickedness of the world deceitfully strives to weaken and completely uproot from souls their Christian faith and the respect for God's law on which faith is fed and depends for its effectiveness. Already the fields cultivated by our Lord are everywhere turning into a wilderness abounding in ignorance of the Faith, in error and vice, as though blown upon by some hideous pest. And to add to the anguish of this thought, so far from putting a check on such insolent and destructive depravity, or imposing the punishment deserved, they who can and should correct matters seem in many cases, by their indifference or open connivance, to increase the spirit of evil.
Source: Magnae Dei Matris (Vatican.va)