John Chrysostom
Do you see how clearly he presents the great benefit of simplicity and the great harm of wisdom? The latter diminished the Cross, while the former proclaimed the power of God. The latter caused people not to know what they ought and to glory in themselves, while the former disposed them to receive the truth and glory in God.
Wisdom led many to consider the apostolic teaching human, while simplicity clearly showed that it was divine and had descended from heaven. When proof is made up of clever words, often the unworthy, being stronger in speech, prevail over the more worthy, and falsehood takes the place of truth.
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Here it is not so. The Holy Spirit does not enter an unclean soul, and when He has entered, He cannot be defeated, even if the whole power of eloquence should rise against Him. For proof by deeds and signs is far clearer than proof by words.
But perhaps someone will say: if the preaching must conquer and has no need of verbal power, so that the Cross may not be emptied, why have signs now ceased? Why? Do you not believe and think that there were none even in the time of the Apostles, or do you truly wish to know when you say this?
If you do not believe, I will first pause over this. If there were no signs then, how did the Apostles persuade? They were persecuted, oppressed, subject to fear and chains, enemies common to all and hated by all. They had nothing attractive in themselves: no eloquence, no nobility, no wealth, no fame from city, people, birth, or skill, and nothing else of the kind. Rather, they had everything opposite to these: lack of learning, low birth, poverty, simplicity, and contempt. Besides this, they rose up against whole nations and proclaimed such truths.
How did they persuade? Their rules were not easy, their dogmas were dangerous, and the hearers who had to be persuaded were given over to pleasure, drunkenness, and great impiety. How then did they persuade, tell me? How did they gain trust? If, as I said before, they persuaded without signs, this is an even greater sign.