32 Further, by assiduous teaching and exhortation, the multitude must be drawn to learn diligently the precepts of religion; for which purpose we earnestly advise that by opportune writings and sermons they be taught the elements of those sacred truths in which Christian philosophy is contained. The result of this will be that the minds of men will be made sound by instruction, and will be protected against many forms of error and inducements to wickedness, especially in the present unbounded freedom of writing and insatiable eagerness for learning.
Source: Humanum Genus (Vatican.va)