John Chrysostom

"For," he says, "in that He hath suffered Himself being tempted, He is able to succor them that are tempted." This is altogether low and mean, and unworthy of God. "For in that He hath suffered Himself," he says. It is of Him who was made flesh that he here speaks, and it was said for the full assurance of the hearers, and on account of their weakness. …

Homily on Hebrews 5 ↗

Theophylact of Ohrid

This, it would seem, is humiliation, humble and unworthy of God. When Paul speaks of the flesh, he touches on everything humiliating, yet not unworthy of the flesh; and there is nothing surprising in this, since even concerning the Father who did not become incarnate, Scripture says much that is anthropomorphic and lowly: "The Lord looked down from heaven upon the children of men, to see" (Ps. 13:2), and: "I will go down and see" (Gen. 18:21), and a great multitude of similar expressions. …

Commentary on Hebrews ↗

Oecumenius

"For because he himself has suffered and been tempted." The statement is humble and not outside the measures of emptiness. Furthermore, it was said also because of the infancy of those who hear. For what does he say? For because he himself has suffered, that is, since he himself has been tempted in his own body, he will more willingly help those who are being tempted. …

The Pseudo-Oecumenian Catena on Hebrews ↗

Thomas Aquinas

154. – Then when he says, For in that wherein he himself has suffered and been tempted, he shows its utility. As if to say: I do not speak of Christ as God, but as man. Therefore, in that, i.e., in that nature which He assumed, in order to experience in Himself that our cause is His own. Hence he says, he suffered and was tempted; therefore, he is able to succor them also that are tempted. Or, another way: He became merciful and faithful, because in suffering and being tempted He has a kinship to mercy. …

Commentary on Hebrews ↗