John Chrysostom

Is it then Angels only? No; for hear what follows: "And of His Angels He saith, Which maketh His Angels spirits, and His ministers a flame of fire: but unto the Son, Thy Throne, O God, is for ever and ever." Behold, the greatest difference! that they are created, but He uncreated. While of His angels He saith, who "maketh"; wherefore of the Son did He not say "Who maketh"? …

Homily on Hebrews 3 ↗

Theophylact of Ohrid

Here is the greatest difference between them: they are created, but He is not created. The expression "You make" means bringing from non-existence into existence. He has superiority not only over the angels alone, but also over all ministering powers. He did not say "made," but "make," that is, preserving by the Word through which they were created. …

Commentary on Hebrews ↗

Oecumenius

"Who makes His angels spirits." For they are created beings, therefore he says, "Who makes." Behold the greatest difference: that some are created, while the One is uncreated; for the act of creating denotes the production from non-being into being. It is not only to angels that the exceptional pertains, but also to every functional power. He did not say, "Having created," but "Creating," that is, sustaining by the Word, according to which they came into being.

The Pseudo-Oecumenian Catena on Hebrews ↗

Thomas Aquinas

58. – Then (v. 7) the reason is given on the part of the angels, why they adore Him. As if to say: It is just that they adore, because they are ministers; hence, he says, he makes his angels winds [spirits] and his servants flames of fire [ministers]. For God sometimes acts by enlightening the intellect: 'He enlightens every man coming into the world' (Jn. 1:9); but sometimes he moves a man to His work: 'You have worked our works in us' (Is. 26:9). …

Commentary on Hebrews ↗