John Chrysostom
“And now, behold, the hand of the Lord is upon you: you shall be blind.” By the same sign through which he himself had been converted, he wished to convert this man also.
The expression “for a time” was the word not of one punishing, but of one converting. If it had been the word of one punishing, he would have made him blind forever. But now it is not so, but “for a time,” in order to gain the proconsul also.
And why did Paul not perform another sign? Because the best thing of all was to catch the enemy.
“And now, behold, the hand of the Lord is upon you.” This was not punishment, but medicine. He spoke as though saying: I am not acting, but the hand of God. Do you see how far he is from pride?
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“You shall be blind and not see the sun for a time.” He says this in order to give him time for repentance. They, the Apostles, never wished to appear too severe, even toward enemies.
Toward their own this was fitting, but toward outsiders it was not, lest the matter appear to be the result of compulsion and fear.
The sign of blindness is the search for a guide. First he exposes what sort of man the magician was. That he truly was such, the sign proved. It was a sign of his spiritual blindness. He suffers for a time, so that he may repent.