John Chrysostom

By thus calling them to Him, and speaking to them face to face, he sooths them in their discomposure; for the two had been speaking with the Lord apart by themselves. But not now as before does He it by bringing forward a child, but He proves it to them by reasoning from contraries; Ye know that the princes of the Gentiles exercise dominion over them. He shows here that it is of the Gentiles to desire preeminence; and by this comparison of the Gentiles He calms their troubled souls.

Catena Aurea by Aquinas ↗

Theophylact of Ohrid

As the ten were stirred up when they heard this, He called them to Himself, and by His calling, before any words were spoken, He calmed them. For the sons of Zebedee spoke to Him after they had separated themselves from the others. Therefore He speaks to them all together. Knowing how tyrannical is the pride of status, requiring a severe rebuke, He touches them to the quick by consigning them to the lot of Gentiles and infidels if they would be vainglorious. …

Commentary on Matthew ↗

Jerome

But Jesus called them to Himself and said, 'You know that the rulers of the Gentiles lord it over them, and their great men exercise authority over them. It is not this way among you, but whoever wishes to become great among you shall be your servant, and whoever wishes to be first among you shall be your slave. …

Commentary on Matthew ↗

Thomas Aquinas

Next, he reproves them. And first, he sets forth the example of the Gentiles; secondly, he teaches that the example is not to be followed, at you know that the princes of the Gentiles lord it over them; thirdly, he sets forth what is to be imitated, at it shall not be so among you. He says, therefore, but Jesus called them to him, giving an example of humility. Above, 11:29: learn of me, because I am meek and humble of heart. And he said: you know that the princes of the Gentiles lord it over them. …

Commentary on Matthew ↗