1Cor 12:2

“Paul shows that there is a very big difference between Christian prophecy and pagan soothsaying. Pagans do not address the unclean spirit but are possessed by it and say things which they do not understand. The soothsayer's soul is darkened, and he does not know what he is saying, whereas the prophet's soul is enlightened and reveals what the prophet has learned and understood.”

“He gives a sign of a soothsayer for distinguishing a prophet, and says: whoever prophesies through idols, under the inspiration of an unclean spirit, is as if led by someone, dragged along bound by the spirit, knowing nothing of what he utters, but being in a state of frenzy and demonic possession. But a prophet is not like that; he speaks everything with a sound mind. This is the first distinction between a demon-possessed diviner and a God-inspired prophet.”

“Secondly, when he says, You know that when you were heathen, he follows out his intention: first, he shows the need for spiritual graces; secondly, he presents the distribution of graces (v. 4). Now the need for a thing is best known from its absence. Hence, in regard to the first he does two things: first, he manifests the loss they suffered, before they received grace; secondly, he concludes to the need for grace (v. 3). First, therefore, he says: You know by experience that when you were heathen, i.e., living as heathen without having yet received grace through Baptism: "We are Jews by birth and not Gentile sinners" (Gal 2:15); "The Gentiles living in the futility of their minds" (Eph 4:17). You were led, as though with a ready and constant mind, as Jer (8:6) says: "Everyone turns to his own course, like a horse plunging into battle"; "Their feet run to evil" (Pr 1:16). To dumb idols, namely, to adore and worship, as it says in Ps 114 (v. 5): "They have a mouth but do not speak." Their lack of speech is particularly stressed, because speech is the proper effect of knowledge. Hence it is shown that idols do not understand and, as a consequence, they have nothing divine, if they are mute. And this, as you were led, i.e., without any resistance. For they were led, either attracted by the beauty of the idols; hence it says in one of Jerome's letters: "You will see in Babylon gods of gold and silver; see that fear does not overtake you in them." Or even by the command of some prince, as it says in Dan (3:1) that Nebuchadnezzar compelled men to adore a golden statue. In 2 Macc it is stated that some were led to the sacrifice with bitter necessity on the king's birthday. Or even by the instigation of demons, who aspire in a special way to have divine worship paid to them: "All these things will I give you, if falling down you adore me" (Matt 4:9). Therefore, they went to cultivate idols according as they were led without resistance, as Pr (7:22) says of the silly youth: "All at once he follows her as an ox is led to the slaughter." This shows that before receiving grace, man quickly runs into sin without resistance. He makes special mention of the sin of idolatry for three reasons: first, because it is a very grave sin to introduce another God, just as one would sin very gravely against a king by introducing another king into his kingdom. Hence, it says in Jb (31:26): "If I have looked at the sun when it shone, or the moon moving in splendor and my mouth has kissed my hand," namely, as a worshipper of the sun and moon, which is the greatest iniquity and denial against God Most High. Secondly, because from the sin of idolatry all other sins arise according to Wis (14:27): "For the worship of idols not to be named is the beginning and cause and end of every evil." Thirdly, because this sin was common among the heathens and was not counted; hence it says in Ps 96 (v. 5): "All the gods of the heathens are demons." It should be noted that some have said that man existing in mortal sin cannot without grace be freed from the sin he lies under, because the remission of sins is brought about only by grace, as it says in Rom (3:24): "They are justified by his grace"; but he can preserve himself from mortal sin without grace, through free will. But this position does not seem to be true. First, because one cannot preserve himself from mortal sin except by observing all the precepts of the law, since no one sins mortally except by transgressing some precept of the law. And so someone could observe all the precepts without grace – which is the Pelagian heresy. Secondly, because no one can without grace have charity, through which God is loved above all things, as it says in Rom (5:5): "God's love has been poured into our hearts through the Holy Spirit which has been given to us." But no one can avoid all sins, unless he loves God above all things: just as that is more despised which is loved less. Therefore, it could happen that for some time a person who lacks grace will abstain from sin, until he encounters that for which he will despise God's precept, and by which he is led into sin. It is significant that the Apostle says, as you were led.”

“Now that he is about to give them spiritual teaching, Paul recalls their former way of life. His intention is that, just as they have been worshipers of idols in the shape of statues and used to be led about by the will of demons, so now, as worshipers of God, they may walk according to the model of the law, so as to be pleasing to God.”