Thomas Aquinas, on Ps 33:7

“This poor man cried, and the Lord heard him: and saved him out of all his troubles.”

“Second, when he says, "The Angel of the Lord shall encamp," he promises a similar benefit; as if to say, others are heard just as this poor man was. Many manuscripts have, "The Angel of the Lord shall encamp." Jerome has, "The Angel of the Lord encamps round about those who fear him." He says therefore, "The Angel of the Lord shall encamp," protecting with the splendor of his light, "round about": Ps. 124: "Mountains are round about him," namely the Angels: 2 Kgs. 6: "There are many more with us than with them." And below: "Behold, the mountain," etc. He shall encamp, therefore, that is, he shall make an encampment: Heb. 1: "All are ministering spirits." "And he shall deliver them," namely from the attack of enemies and demons: Jdt. 7: "The children of Israel do not trust in lance or arrow, but the mountains defend them," namely the Angel, or Christ: Is. 9. According to the translation of the Seventy Interpreters, "He shall be called the Angel of great counsel." Because he was sent by God insofar as he is man. Or, Angel is understood as a prelate of the Church: Mal. 2: "He is the angel of the Lord of hosts." For the prelates of the Church ought to guard their flock.”

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