Cyril of Alexandria

But then He turned the eyes of all men upon Him, wondering how He knew the writing which He had never learnt. But since it was the custom of the Jews to say that the prophecies spoken of Christ are completed either in certain of their chiefs, i. e. their kings, or in some of their holy prophets, the Lord made this announcement; as it follows, But he began to say unto them that this Scripture is fulfilled.

Catena Aurea by Aquinas ↗

Bede

And the eyes of all in the synagogue were fixed upon him. And he began to say to them: "Today this Scripture is fulfilled in your hearing." Indeed, it was fulfilled in that, as it had predicted: "And the Lord did great things, and preached even greater things." What greater testimony do we seek, therefore, than that he, who spoke in the prophets, confirmed with his own voice that he was the one? …

On the Gospel of Luke ↗

Bonaventure

Here in the fourth place, after the congruity in the testimony has been described, the belief among the people is noted. To express this, there is indicated maturity in the teacher, eagerness to hear in the people standing by, truth in the instruction, and belief in those instructed. To express, therefore, the maturity in the teacher, it says: And when he had closed the book, he returned it to the minister and sat down. …

Commentary on Luke, Chapter 4 ↗