John Chrysostom
The Apostle said that God had not rejected His people. Having explained in what sense He had not rejected them, he again turned to the prophets.
On their basis he proved that the greater part of the Jews had perished. Yet he did not want anyone to think he accused them arbitrarily, insulted them by his speech, or attacked them as an enemy.
Therefore he turns to David and Isaiah, saying: "As it is written: God gave them a spirit of compunction."
Yet even here he is not satisfied with his own judgment, but again points to the prophet Isaiah. After saying, "they were blinded," he adds: "As it is written: God gave them a spirit of compunction."
Whence did this blindness arise? The Apostle had already explained its causes and placed all the blame on the heads of the Jews themselves.
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He proved that they fell into blindness because of unreasonable stubbornness. Now he repeats the same thing.
When he says, "eyes that should not see and ears that should not hear," he accuses nothing else but their stubborn will.
They had eyes to see miracles and received ears to hear wondrous teaching. Yet they did not use either as they ought.
By the word "gave," therefore, understand here not cooperation, but permission.
By compunction the Apostle here means a habit of soul toward the worse, wholly incurable and beyond correction.
In another place David says: "That my glory may sing praise to You, and I may not be moved to compunction" (Ps 29:13), that is, that I may not be changed.
As one moved to compunction in piety is not easily changed, so one moved to compunction in evil can only with difficulty turn away from it.
For to be moved to compunction means nothing other than to be strengthened and attached to something.
Therefore the Apostle, wishing to express that the will of the Jews was incurable and difficult to correct, called this a spirit of compunction.