In the five former books, I think I have sufficiently disputed against those who believe that the many false gods, which the Christian truth shows to be useless images, or unclean spirits and pernicious demons, or certainly creatures, not the Creator, are to be worshipped for the advantage of this mortal life, and of terrestrial affairs, with that rite and service which the Greeks call λατρεία, and which is due to the one true God. And who does not know that, in the face of excessive stupidity and obstinacy, neither these five nor any other number of books whatsoever could be enough, when it is esteemed the glory of vanity to yield to no amount of strength on the side of truth—certainly to his destruction over whom so heinous a vice tyrannizes?
For, notwithstanding all the assiduity of the physician who attempts to effect a cure, the disease remains unconquered, not through any fault of his, but because of the incurableness of the sick man. But those who thoroughly weigh the things which they read, having understood and considered them, without any, or with no great and excessive degree of that obstinacy which belongs to a long-cherished error, will more readily judge that, in the five books already finished, we have done more than the necessity of the question demanded, than that we have given it less discussion than it required.
And they cannot have doubted but that all the hatred which the ignorant attempt to bring upon the Christian religion on account of the disasters of this life, and the destruction and change which befall terrestrial things, while the learned do not merely dissimulate, but encourage that hatred, contrary to their own consciences, being possessed by a mad impiety—they cannot have doubted, I say, but that this hatred is devoid of right reflection and reason, and full of most light temerity, and most pernicious animosity.
Source: City of God (New Advent)