John Chrysostom

And therefore he added, "For I am jealous over you with a godly jealousy." He did not say, "for I love you," but uses a term far more vehement than this. For those souls are jealous which burn ardently for those they love, and jealousy can in no other way be begotten than out of a vehement affection. …

Homily 23 on 2 Corinthians ↗

Theophylact of Ohrid

He did not say "I love," but, to express it much more strongly: "I am jealous." For jealousy arises in those who love ardently. Then, lest they think he is jealous over them for some human motives, for the sake of money or glory, he adds: "with godly jealousy"; for it is said that God also is jealous, having exceedingly loved us, not in order to gain some advantage, but to save us, bringing us into communion and union with Himself. …

Commentary on 2 Corinthians ↗

Clement of Alexandria

Directly in point is the instance of the apostle, who says, writing the Corinthians: "For I have espoused you to one man, that I may present you as a chaste virgin to Christ," whether as children or saints, but to the Lord alone. And writing to the Ephesians, he has unfolded in the clearest manner the point in question, speaking to the following effect: "Till we all attain to the unity of the faith, and of the knowledge of God, to a perfect man, to the measure of the stature of the fulness of Christ: that we be no longer children, …

The Instructor Book 1 ↗

Thomas Aquinas

Then, saying I feel a divine jealousy, he shows the need for this commendation. In regard to this he does three things. First, he shows that a commendation of this sort springs from zeal, to exclude folly; secondly, he says that this zeal is not irregular, to avoid indiscretion (v. 3); thirdly, he rejects their excuse (v. 4). In regard to the first he does two things. First, he mentions the holy zeal he has for them; secondly, the cause of this zeal, because his office obliged him (v. 2b). …

Commentary on 2 Corinthians ↗