12 Yet who can fail to see, Venerable Brethren, that while men are led by reason and liberty, the principal way to restore the empire of God in their souls is religious instruction? How many there are who mimic Christ and abhor the Church and the Gospel more through ignorance than through badness of mind, of whom it may well be said: "They blaspheme whatever things they know not" ( Jude ii., 10). This is found to be the case not only among the people at large and among the lowest classes, who are thus easily led astray, but even among the more cultivated and among those endowed moreover with uncommon education. The result is for a great many the loss of the faith. For it is not true that the progress of knowledge extinguishes the faith; rather is it ignorance, and the more ignorance prevails the greater is the havoc wrought by incredulity. And this is why Christ commanded the Apostles: "Going forth teach all nations" ( Matth . xxvii., 19).
Source: E Supremi (Vatican.va)