11 Therefore was the son of man first visited in the person of the very Lord Man, born of the Virgin Mary. Of whom, by reason of the very weakness of the flesh, which the Wisdom of God vouchsafed to bear, and the humiliation of the Passion, it is justly said, “You have lowered Him a little lower than the Angels”. But that glorifying is added, in which He rose and ascended up into heaven; “With glory,” he says, “and with honour have You crowned Him; and hast set Him over the works of Your hands”. Since even Angels are the works of God's hands, even over Angels we understand the Only-begotten Son to have been set; whom we hear and believe, by the humiliation of the carnal generation and passion, to have been lowered a little lower than the Angels.
12. “You have put,” he says, “all things in subjection under His feet.” When he says, “all things,” he excepts nothing. And that he might not be allowed to understand it otherwise, the Apostle enjoins it to be believed thus, when he says, “He being excepted which put all things under Him.” And to the Hebrews he uses this very testimony from this Psalm, when he would have it to be understood that all things are in such sort put under our Lord Jesus Christ, as that nothing should be excepted. And yet he does not seem, as it were, to subjoin any great thing, when he says, “All sheep and oxen, yea, moreover, the beasts of the field, birds of the air, and the fish of the sea, which walk through the paths of the sea”. For, leaving the heavenly excellencies and powers, and all the hosts of Angels, leaving even man himself, he seems to have put under Him the beasts merely; unless by sheep and oxen we understand holy souls, either yielding the fruit of innocence, or even working that the earth may bear fruit, that is, that earthly men may be regenerated unto spiritual richness. By these holy souls then we ought to understand not those of men only, but of all Angels too, if we would gather from hence that all things are put under our Lord Jesus Christ. For there will be no creature that will not be put under Him, under whom the pre-eminent spirits, that I may so speak, are put. But whence shall we prove that sheep can be interpreted even, not of men, but of the blessed spirits of the angelical creatures on high? May we from the Lord's saying that He had left ninety and nine sheep in the mountains, that is, in the higher regions, and had come down for one? For if we take the one lost sheep to be the human soul in Adam, since Eve even was made out of his side, for the spiritual handling and consideration of all which things this is not the time, it remains that, by the ninety and nine left in the mountains, spirits not human, but angelical, should be meant. For as regards the oxen, this sentence is easily dispatched; since men themselves are for no other reason called oxen, but because by preaching the Gospel of the word of God they imitate Angels, as where it is said, “You shall not muzzle the ox that treads out the grain.” How much more easily then do we take the Angels themselves, the messengers of truth, to be oxen, when Evangelists by the participation of their title are called oxen? “You have put under” therefore, he says, “all sheep and oxen,” that is, all the holy spiritual creation; in which we include that of holy men, who are in the Church, in those wine-presses to wit, which are intimated under the other similitude of the moon and stars.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)