Augustine of Hippo

"On a rock has He exalted me." And that what I believed might be made manifest for salvation, He has made my confession to be conspicuous in His own strength. "And now, lo! He has exalted mine head above mine enemies" [Psalm 27:6]. What does He reserve for me at the last, when even now the body is dead because of sin, lo! I feel that my mind serves the law of God, and is not led captive under the rebellious law of sin? …

Exposition on Psalm 27 ↗

Bede

The Lord Christ is the head of all the saints, in himself always remaining equal and indivisible, to be sure, but distributing the grace of his Spirit to each one of those who are elect, according to their capacity for receiving. For this reason, not only to the whole church in general but also to each of its members in particular is it permissible to proclaim with confidence that prophetic [word]: "And now he has lifted up my head above my enemies."

On the Tabernacle 2:9 ↗

Thomas Aquinas

"I went around." Here the recompense for the benefit is presented; and he sets forth two things. First, sacrifice, and "he offered." Second, a canticle. According to Jerome, it is connected with the preceding: "above my enemies, and they are round about us." "I went around," that is, I stood about offering devout prayers for them: Ps. 108: "Instead of loving me, they detracted from me," etc. Sir. 50: "And he, standing around the altar," etc. …

Exposition on the Psalms of David ↗