There is nothing improbable in the supposition that St. Paul mentions the magicians who withstood Moses as typical opponents of the truth, because the false teachers at Ephesus used magic arts; and the word which he uses for impostors (=goêtes=) in ver. 13 fits in very well with such a supposition, although it by no means makes it certain. Ephesus was famous for its charms and incantations (=Ephesia grammata=), and around the statue of its goddess Artemis were unintelligible inscriptions, to which a strange efficacy was ascribed. The first body of Christians in Ephesus had been tainted by senseless wickedness of this kind. After accepting Christianity they had secretly retained their magic. The sons of the Jew Sceva had tried to use the sacred name of Jesus as a magical form of exorcism; and this brought about the crisis in which numbers of costly books of incantations were publicly burned (Acts xix. 13-20). The evil would be pretty sure to break out again, especially among new converts; just as it does among negro converts at the present day. Moreover we know that in some cases there was a very close connexion between some forms of heresy and magic: so that the suggestion that St. Paul has pretensions to miraculous power in his mind, when he compares the false teachers to the Egyptian magicians, is by no means improbable.
The connexion between heresy and superstition is a very real and a very close one. The rejection or surrender of religious truth is frequently accompanied by the acceptance of irrational beliefs. People deny miracles and believe in spiritualism; they cavil at the efficacy of sacraments and accept as credible the amazing properties of an 'astral body.' There is such a thing as the nemesis of unbelief. The arrogance which rejects as repugnant to reason and morality truths which have throughout long centuries satisfied the highest intellects and the noblest hearts, is sometimes punished by being seduced into delusions which satisfy nothing higher than a grovelling curiosity.