Cyril of Alexandria

But what were the things He taught, unless such as transcended the worship of the law? But because His speech was with power, and with authority He applied to spiritual worship the things which had been delivered in figures by Moses and the Prophets, the people heard Him gladly. As it follows, And the whole people made haste to come early to hear him in the temple. But the people who came to Him before light might with fitness say, O God my God, early do I wait upon thee.

Catena Aurea by Aquinas ↗

Theophylact of Ohrid

At night the Lord withdrew to the mountain, showing us that in the quiet of the night one should converse with God, while by day, amid encounters with people, one should bring them benefit — gathering by night and distributing by day what has been gathered. …

Commentary on Luke ↗

Bede

But he was teaching in the temple by day, and by night going out he stayed on the mount called Olivet. And all the people would come early in the morning to him in the temple, to hear him. What the Lord commands in words, he confirms by his deeds. …

On the Gospel of Luke ↗

Bonaventure

Fourth, as regards the introduction of example, there is subjoined: And during the days he was teaching in the temple, as one watching with regard to the exercise of the active life, so that he might give an example for the exercise of perfect action, according to that passage of Second Timothy four: "Preach the word, be urgent in season, out of season," etc.; and again in the same place: "But you, be watchful, labor in all things," etc. …

Commentary on Luke, Chapter 21 ↗