Reply Obj. 2: The term latria may be taken in two senses. In one sense it may denote a human act pertaining to the worship of God: and then its signification remains the same, to whomsoever it be shown, because, in this sense, the thing to which it is shown is not included in its definition. Taken thus latria is applied univocally, whether to true religion or to idolatry, just as the payment of a tax is univocally the same, whether it is paid to the true or to a false king. In another sense latria denotes the same as religion, and then, since it is a virtue, it is essential thereto that divine worship be given to whom it ought to be given; and in this way latria is applied equivocally to the latria of true religion, and to idolatry: just as prudence is applied equivocally to the prudence that is a virtue, and to that which is carnal.
Reply Obj. 3: The saying of the Apostle that "an idol is nothing in the world" means that those images which were called idols, were not animated, or possessed of a divine power, as Hermes maintained, as though they were composed of spirit and body. In the same sense we must understand the saying that "what is offered in sacrifice to idols is not anything," because by being thus sacrificed the sacrificial flesh acquired neither sanctification, as the Gentiles thought, nor uncleanness, as the Jews held.
Reply Obj. 4: It was owing to the general custom among the Gentiles of worshipping any kind of creature under the form of images that the term "idolatry" was used to signify any worship of a creature, even without the use of images. _______________________
SECOND ARTICLE [II-II, Q. 94, Art. 2]
Whether Idolatry Is a Sin?
Objection 1: It would seem that idolatry is not a sin. Nothing is a sin that the true faith employs in worshipping God. Now the true faith employs images for the divine worship: since both in the Tabernacle were there images of the cherubim, as related in Ex. 25, and in the Church are images set up which the faithful worship. Therefore idolatry, whereby idols are worshipped, is not a sin.
Obj. 2: Further, reverence should be paid to every superior. But the angels and the souls of the blessed are our superiors. Therefore it will be no sin to pay them reverence by worship, of sacrifices or the like.
Obj. 3: Further, the most high God should be honored with an inward worship, according to John 4:24, "God . . . they must adore . . . in spirit and in truth": and Augustine says (Enchiridion iii), that "God is worshipped by faith, hope and charity." Now a man may happen to worship idols outwardly, and yet not wander from the true faith inwardly. Therefore it seems that we may worship idols outwardly without prejudice to the divine worship.
On the contrary, It is written (Ex. 20:5): "Thou shalt not adore them," i.e. outwardly, "nor serve them," i.e. inwardly, as a gloss explains it: and it is a question of graven things and images. Therefore it is a sin to worship idols whether outwardly or inwardly.
I answer that, There has been a twofold error in this matter. For some [*The School of Plato] have thought that to offer sacrifices and other things pertaining to latria, not only to God but also to the others aforesaid, is due and good in itself, since they held that divine honor should be paid to every superior nature, as being nearer to God. But this is unreasonable. For though we ought to revere all superiors, yet the same reverence is not due to them all: and something special is due to the most high God Who excels all in a singular manner: and this is the worship of latria.