Augustine of Hippo

For although man made gods, it did not follow that he who made them was not held captive by them, when, by worshipping them, he was drawn into fellowship with them,—into the fellowship not of stolid idols, but of cunning demons; for what are idols but what they are represented to be in the same scriptures, "They have eyes, but they do not see," and, though artistically fashioned, are still without life and sensation? But unclean spirits, associated through that wicked art with these same idols, have miserably taken captive the souls of their worshippers, by bringing them down into fellowship with themselves. Whence the apostle says, "We know that an idol is nothing, but those things which the Gentiles sacrifice they sacrifice to demons, and not to God; and I would not ye should have fellowship with demons."