Nicene and Post-Nicene Fathers, Vol. II: City of God: Boo...
Argument—Having in the preceding book shown that the worship of demons must be abjured, since they in a thousand ways proclaim themselves to be wicked spirits, Augustin in this book meets those who allege a distinction among demons, some being evil, while others are good; and, having exploded this distinction, he proves that to no demon, but to Christ alone, belongs the office of providing men with eternal blessedness.