John Chrysostom
When you see someone not pronouncing the name of Jesus, he says, or even anathematizing Him, he is a diviner. But when you see another who speaks of everything in His name, know that he is spiritual.
What then, you ask, are we to say about catechumens? If no one can call Jesus Lord except by the Holy Spirit, what shall we say of those who pronounce His name but do not have the Spirit?
He is not speaking of them now, since the Corinthians were not then catechumens. He is speaking of believers and unbelievers.
But does no demon name God? Did not the possessed say, "I know who You are, the Holy One of God" (Mk 1:24)? Did they not also say to Paul, "These men are servants of the Most High God" (Acts 16:17)?
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They said this when they were tormented and compelled, but never willingly and without torment.
Here one may ask why the demon said this, and why Paul forbade him. Paul was imitating his Master. Christ also forbade the demons to speak, since He did not wish to receive testimony from them.
Why did the demon do this? He wished to create confusion, deprive the Apostles of honor, and incline many to listen to himself.
If this had been allowed, the demons would have appeared trustworthy. They would easily have begun introducing whatever they wished.
Therefore, lest this happen, and lest deception receive even a beginning, the Apostle stops their mouths even when they speak the truth. He does this so that no one will ever heed them when they lie.
Rather, everyone should turn his hearing away from whatever they may say.
Having thus shown the first and second marks of diviners and prophets, the Apostle next speaks about miracles. He approaches this subject in a way that will end the discord arising from it.
He wants to persuade those who received less not to grieve, and those who received more not to be puffed up. Therefore he begins thus: "There are diversities of gifts, but the same Spirit" (v. 4).