1 Corinthians 2:5
“That your faith should not stand in the wisdom of men, but in the power of God.”
Do you see how clearly in every way he has set forth the vast gain of this “ignorance,” and the great loss of this “wisdom?” For the latter made void the Cross, but the former proclaimed the power of God: the latter, besides their failing to discover any of those things which they most needed, set them also upon boasting of themselves; the former, besides their receiving the truth, led them also to pride themselves in God. Again, wisdom would have persuaded many to suspect that the doctrine was of man: this clearly demonstrated it to be divine, and to have come down from heaven. Now when demonstration is made by wisdom of words, even the worse oftentimes overcome the better, having more skill in words; and falsehood outstrips the truth. But in this case it is not so: for neither does the Spirit enter into an unclean soul, nor, having entered in, can it ever be subdued; even though all possible cleverness of speech assail it. For the demonstration by works and signs is far more evident than that by words.
4. But some one may say perhaps, “If the Gospel is to prevail and has no need of words, lest the Cross be made of none effect; for what reason are signs withholden now?” For what reason? Speakest thou in unbelief and not allowing that they were done even in the times of the Apostles, or do you truly seek to know? If in unbelief, I will first make my stand against this. I say then, If signs were not done at that time, how did they, chased, and persecuted, and trembling, and in chains, and having become the common enemies of the world, and exposed to all as a mark for ill usage, and with nothing of their own to allure, neither speech, nor show, nor wealth, nor city, nor nation, nor family, nor pursuit (ἐπιτήδευμα,) nor glory, nor any such like thing; but with all things contrary, ignorance, meanness, poverty, hatred, enmity, and setting themselves against whole commonwealths, and with such a message to declare; how, I say, did they work conviction? For both the precepts brought much labor, and the doctrines many dangers. And they that heard and were to obey, had been brought up in luxury and drunkenness, and in great wickedness. Tell me then, how did they convince? Whence had they their credibility? For, as I have just said, If without signs they wrought conviction, far greater does the wonder appear. Do not then urge the fact that signs are not done now, as a proof that they were not done then. For as then they were usefully wrought; so now are they no longer so wrought.
Nor does it necessarily follow from discourse being the only instrument of conviction, that now the “preaching” is in “wisdom.” For both they who from the beginning sowed the word were unprofessional (ὶδιῶται) and unlearned, and spoke nothing of themselves; but what things they received from God, these they distributed to the world: and we ourselves at this time introduce no inventions of our own; but the things which from them we have received, we speak unto all. And not even now persuade we by argumentation; but from the Divine Scriptures and from the miracles done at that time we produce the proof of what we say. On the other hand, even they at that time persuaded not by signs alone, but also by discoursing. And the signs and the testimonies out of the Old Scriptures, not the cleverness of the things said, made their words appear more powerful.
5. How then, you will say, is it that signs were expedient then, and now inexpedient? Let us suppose a case, (for as yet I am contending against the Greek, and therefore I speak hypothetically of what must certainly come to pass,) let us, I say, suppose a case; and let the unbeliever consent to believe our affirmations, though it be only by way of concession: (κἄν κατὰ συνδρομήν) for instance, That Christ will come. When then Christ shall come and all the angels with Him, and be manifested as God, and all things made subject unto Him; will not even the Greek believe? It is quite plain that he will also fall down and worship, and confess Him God, though his stubbornness exceed all reckoning. For who, at sight of the heavens opened and Him coming upon the clouds, and all the congregation of the powers above spread around Him, and rivers of fire coming on, and all standing by and trembling, will not fall down before Him, and believe Him God? Tell me, then; shall that adoration and knowledge be accounted unto the Greek for faith? No, on no account. And why not? Because this is not faith. For necessity has done this, and the evidence of the things seen, and it is not of choice, but by the vastness of the spectacle the powers of the mind are dragged along. It follows that by how much the more evident and overpowering the course of events, by so much is the part of faith abridged. For this reason miracles are not done now.
And that this is the truth, hear what He says unto Thomas “Blessed are they who have not seen, and yet have believed.” Therefore, in proportion to the evidence wherewith the miracle is set forth is the reward of faith lessened. So that if now also miracles were wrought, the same thing would ensue. For that then we shall no longer know Him by faith, Paul has shown, saying, “For now we walk by faith, not by sight.” As at that time, although thou believe, it shall not be imputed unto you, because the thing is so palpable; so also now, supposing that such miracles were done as were formerly. For when we admit things which in no degree and in no way can be made out by reasoning, then it is faith. It is for this that hell is threatened, but is not shown: for if it were shown, the same would again ensue.
Source: Homilies on First Corinthians (New Advent)