3 They practise also magical arts and incantations; philters, also, and love-potions; and have recourse to familiar spirits, dream-sending demons, and other abominations, declaring that they possess power to rule over, even now, the princes and formers of this world; and not only them, but also all things that are in it. These men, even as the Gentiles, have been sent forth by Satan to bring dishonour upon the Church, so that, in one way or another, men hearing the things which they speak, and imagining that we all are such as they, may turn away their ears from the preaching of the truth; or, again, seeing the things they practise, may speak evil of us all, who have in fact no fellowship with them, either in doctrine or in morals, or in our daily conduct. But they lead a licentious life, and, to conceal their impious doctrines, they abuse the name [of Christ], as a means of hiding their wickedness; so that “their condemnation is just,” when they receive from God a recompense suited to their works.
Source: Adversus haereses (New Advent)