And we should remember that Satan has his wonders, which, though they are juggling tricks rather than real miracles, are such as delude the ignorant and inexperienced.

Magicians and enchanters have always been famous for miracles; idolatry has been supported by astonishing miracles; and yet we admit them not as proofs of the superstition of magicians or idolaters.

With this engine also the simplicity of the vulgar was anciently assailed by the Donatists, who abounded in miracles.

We therefore give the same answer now to our adversaries as Augustine[14] gave to the Donatists, that our Lord hath cautioned us against these miracle-mongers by his prediction, that there should arise false prophets, who, by various signs and lying wonders, "should deceive (if possible) the very elect."[15] And Paul has told us, that the kingdom of Antichrist would be "with all power, and signs, and lying wonders."[16] But these miracles (they say) are wrought, not by idols, or sorcerers, or false prophets, but by saints; as if we were ignorant, that it is a stratagem of Satan to "transform" himself "into an angel of light."[17] At the tomb of Jeremiah,[18] who was buried in Egypt, the Egyptians formerly offered sacrifices and other divine honours.

Was not this abusing God's holy prophet to the purposes of idolatry?
Yet they supposed this veneration of his sepulchre to be rewarded with a cure for the bite of serpents.