John Chrysostom

"For not to angels," he says, "did He put in subjection the world to come, whereof we speak." Is he then discoursing concerning some other world? No, but concerning this. Therefore he added "whereof we speak," that he might not allow the mind to wander away in search of some other. How then does he call it "the world to come"? Exactly as he also says in another place, "Who is the figure of him that was to come," (Rom. v. …

Homily on Hebrews 4 ↗

Theophylact of Ohrid

Showing further the superiority of the Son over the angels, he says that God subjected the universe, that is, this world, not to them but to the Son. He calls it "the world to come," because the Son of God always existed, while it was yet to appear, since obviously it did not exist before. Therefore, in relation to the eternal existence of the Son, the universe was indeed the world to come. "Of which we speak" — that is, about the universe, of which it was said above: "when He brings the Firstborn into the world" (Heb. 1:6). …

Commentary on Hebrews ↗

Oecumenius

"For it was not to angels that He subjected the world." This is a consequence of the comparison with the angels that was previously stated. For it was necessary for the chief creature, namely the angelic one, by consulting Christ according to the flesh, to show Him to be greater as the Lord. He speaks of the future world when He says the world to come. "of which we are speaking." That is, concerning which we said above that, When he brings in the firstborn into the world. …

The Pseudo-Oecumenian Catena on Hebrews ↗

Thomas Aquinas

100. – Having made a comparison to show that it is more necessary to observe the commandments of Christ than those of the Law delivered by angels, the Apostle now confirms the consequence. First, he confirms this consequence by showing that Christ's power is greater than that of the angels; secondly, he proves this on the authority of Scripture (v. 6). 101. …

Commentary on Hebrews ↗