1 Simon the Samaritan was that magician of whom Luke, the disciple and follower of the apostles, says, “But there was a certain man, Simon by name, who beforetime used magical arts in that city, and led astray the people of Samaria, declaring that he himself was some great one, to whom they all gave heed, from the least to the greatest, saying, This is the power of God, which is called great. And to him they had regard, because that of long time he had driven them mad by his sorceries.” This Simon, then— who feigned faith, supposing that the apostles themselves performed their cures by the art of magic, and not by the power of God; and with respect to their filling with the Holy Ghost, through the imposition of hands, those that believed in God through Him who was preached by them, namely, Christ Jesus— suspecting that even this was done through a kind of greater knowledge of magic, and offering money to the apostles, thought he, too, might receive this power of bestowing the Holy Spirit on whomsoever he would—was addressed in these words by Peter: “Your money perish with you, because you have thought that the gift of God can be purchased with money: you have neither part nor lot in this matter, for your heart is not right in the sight of God; for I perceive that you are in the gall of bitterness, and in the bond of iniquity.” He, then, not putting faith in God a whit the more, set himself eagerly to contend against the apostles, in order that he himself might seem to be a wonderful being, and applied himself with still greater zeal to the study of the whole magic art, that he might the better bewilder and overpower multitudes of men. Such was his procedure in the reign of Claudius Cæsar, by whom also he is said to have been honoured with a statue, on account of his magical power. This man, then, was glorified by many as if he were a god; and he taught that it was himself who appeared among the Jews as the Son, but descended in Samaria as the Father while he came to other nations in the character of the Holy Spirit. He represented himself, in a word, as being the loftiest of all powers, that is, the Being who is the Father over all, and he allowed himself to be called by whatsoever title men were pleased to address him.
Source: Adversus haereses (New Advent)