Acts 19:14

"And there were seven sons of one Sceva, a Jew, and chief of the priests, which did so. And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye? And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded." They did it in secret: then their impotence is publicly exposed. Then not the Name does anything, unless it be spoken with faith. See how they used their weapons against themselves! So far were they from thinking Jesus to be anything great: no, they must needs add Paul, as thinking him to be something great. Here one may marvel how it was that the demon did not cooperate with the imposture of the exorcists, but on the contrary exposed them, and laid open their stage-play. He seems to me to have done this in exceeding wrath: just as it might be, if a person being in uttermost peril, should be exposed by some pitiful creature, and wish to vent all his rage upon him.

However, there were some seven sons of a Jewish high priest named Sceva, who were doing this. It is better read according to the Greek: However, there was of a certain Sceva. Since even Satan himself transforms into an angel of light (II Cor. XI), he does not fear to color his ministers with the same pretense. Hence, since the grace of the Holy Spirit is usually designated by the number seven, in which figure the Lord, after the resurrection, feasts with seven disciples, and seven brothers come to Cornelius to baptize him with the Holy Spirit, the sons of Sceva are reckoned as if they are to expel evil spirits in the number seven. Since they invoke the name of Christ and the apostles, not believing, but testing, they are deservedly condemned not only by God but also by the very demons for their deceitful falseness. They are well called the sons of Sceva, which translates to "little fox crying out." This animal, very crafty and deceitful, shows Jews, Gentiles, and heretics always lurking against the Church of God and chattering with a garrulous voice. Concerning whom it is commanded by the guardians of the same Church: Catch for us the little foxes that ruin the vineyards.

Neither is every one that prophesies holy, nor every one that casts out devils religious: for even Balaam the son of Beor the prophet did prophesy, though he was himself ungodly; as also did Caiaphas, the falsely-named high priest. Nay, the devil foretells many things, and the demons, about Him; and yet for all that, there is not a spark of piety in them: for they are oppressed with ignorance, by reason of their voluntary wickedness. It is manifest, therefore, that the ungodly, although they prophesy, do not by their prophesying cover their own impiety; nor will those who cast out demons be sanctified by the demons being made subject to them; for they only mock one another, as they do who play childish tricks for mirth, and destroy those who give heed to them. For neither is a wicked king any longer a king, but a tyrant; nor is a bishop oppressed with ignorance or an evil disposition a bishop, but falsely so called, being not one sent out by God, but by men... And indeed Balaam the prophet, when he had corrupted Israel by Baalpeor, suffered punishment; and Caiaphas at last was his own murderer; and the sons of Sceva, endeavouring to cast out demons, were wounded by them, and fled away in an unseemly manner; and the kings of Israel and of Judah, when they became impious, suffered all sorts of punishments. It is therefore evident how bishops and presbyters, also falsely so called, will not escape the judgment of God.