Now just as this divine worship was given to sensible creatures by means of sensible signs, such as sacrifices, games, and the like, so too was it given to a creature represented by some sensible form or shape, which is called an “idol.” Yet divine worship was given to idols in various ways. For some, by means of a nefarious art, constructed images which produced certain effects by the power of the demons: wherefore they deemed that the images themselves contained something God-like, and consequently that divine worship was due to them. This was the opinion of Hermes Trismegistus [De Natura Deorum, ad Asclep], as Augustine states (De Civ. Dei viii, 23): while others gave divine worship not to the images, but to the creatures represented thereby. The Apostle alludes to both of these (Romans 1:23-25). For, as regards the former, he says: “They changed the glory of the incorruptible God into the likeness of the image of a corruptible man, and of birds, and of four-footed beasts, and of creeping things,” and of the latter he says: “Who worshipped and served the creature rather than the Creator.”
These latter were of three ways of thinking. For some deemed certain men to have been gods, whom they worshipped in the images of those men: for instance, Jupiter, Mercury, and so forth. Others again deemed the whole world to be one god, not by reason of its material substance, but by reason of its soul, which they believed to be God, for they held God to be nothing else than a soul governing the world by movement and reason: even as a man is said to be wise in respect not of his body but of his soul. Hence they thought that divine worship ought to be given to the whole world and to all its parts, heaven, air, water, and to all such things: and to these they referred the names of their gods, as Varro asserted, and Augustine relates (De Civ. Dei vii, 5). Lastly, others, namely, the Platonists, said that there is one supreme god, the cause of all things. After him they placed certain spiritual substances created by the supreme god. These they called “gods,” on account of their having a share of the godhead; but we call them “angels.” After these they placed the souls of the heavenly bodies, and beneath these the demons which they stated to be certain animal denizens of the air, and beneath these again they placed human souls, which they believed to be taken up into the fellowship of the gods or of the demons by reason of the merit of their virtue. To all these they gave divine worship, as Augustine relates (De Civ . . Dei xviii, 14).
…
Now all these come under the head of the superstition of idolatry. Wherefore Augustine says (De Doctr. Christ. ii, 20): “Anything invented by man for making and worshipping idols, or for giving Divine worship to a creature or any part of a creature, is superstitious.”