John Chrysostom

Then He proceeds to upbraid the cities now that wisdom hath been justified; now that He hath shown all to be fully performed. That is, having failed to persuade them, He now doth but lament over them; which is more than terrifying. For He had exhibited both His teaching by His words, and His wonder-working power by His signs. But forasmuch as they abode in their own unbelief, He now does but upbraid. …

Homily on the Gospel of Matthew 37 ↗

Theophylact of Ohrid

After showing that He had done everything that He ought to have done, and they remained unrepentant, then He upbraids them.

Commentary on Matthew ↗

Augustine of Hippo

Luke also gives this as spoken in continuation of some other of the Lord's discourses; from which it appears that he has rather followed the actual order of events; Matthew to have followed his recollection. Or the words of Matthew, Then began he to upbraid the towns, must be taken, as some think, as expressing some particular time by the word then, but not referring generally to that time in which the many other things here told were done and said. …

Catena Aurea by Aquinas ↗

Jerome

Then he began to reproach the cities in which most of his miracles had been performed, because they did not repent. The reproach of the cities of Chorazin, Bethsaida, and Capernaum is explained by the heading of this chapter. He reproached them because after performing many miracles and signs, they did not repent.

Commentary on Matthew ↗

Thomas Aquinas

Having satisfied John's disciples, he now rebukes non-believers: first, the Lord's deed is described; secondly, his words (v. 21). He says, therefore, Then he began to upbraid the cities. The upbraiding is concerned with the benefits and with gifts. For the Lord had conferred a great benefit, because he had enlightened them by his presence; but they were ungrateful and, consequently, deserved rebuke: "O my people, what have I done to you? In what way have I wearied you?" (Mic 6:3). …

Commentary on Matthew ↗