Thomas Aquinas, on Ps 45:7

“Nations were troubled, and kingdoms were bowed down: he uttered his voice, the earth trembled.”

“"The Lord of hosts." Here he explains what he said about the consolation, namely what he said: "God is in the midst of it." And he describes God who helps, both his presence and his assistance. He describes God in two ways: because he is "the Lord of hosts," since he rules not only lower creatures but also the heavenly powers. It was not sufficient for man that angels be sent, whom he sent for the giving of the old covenant; but it was necessary that he himself come, so that it might be known that the human soul is of such great excellence that it can be made blessed only in the God of hosts: Ps. 79: "Lord of hosts, look and see," etc. And he is with us, first through the likeness of the flesh: Phil. 2: "Made in the likeness of men." Also through familiar conversation: Bar. 3: "After this he was seen on earth," etc. Also through grace, dwelling in us: Eph. 3: "That Christ may dwell through faith," etc. And therefore he is called Emmanuel, that is, "God with us." "The God of Jacob is our protector." Here he shows the help he has from God, because God himself is "our protector, who has taken us into his care": Ps. 3: "But you, O Lord, are my protector." Or he shows how God is with us, namely, because he took on our nature: Heb. 2: "He never takes hold of angels, but of the seed of Abraham." Therefore he is called "the God of Jacob." He is called "God of hosts" on account of the Gentiles, lest they believe that we do not have a different God than they: Heb. 2: "He is not ashamed to call them brothers, saying: I will declare your name to my brothers; in the midst of the Church I will praise you" (Ps. 21).”

Imported from an open dataset — not yet checked against the printed edition.