10 But observe holy men, who are like the Angels. When you have found some holy man who serves God, if you wish to worship him instead of God, he forbids you: he will not arrogate to himself the honour due to God, he will not be unto you as God, but be with you under God. Thus did the holy Apostles Paul and Barnabas. They preached the word of God in Lycaonia. When they had performed wonderful works in Lycaonia, the people of that country brought victims, and wished to sacrifice to them, calling Barnabas Jupiter, and Paul Mercury: they were not pleased. Did they perchance refuse to be sacrificed to, because they abhorred to be compared to devils? No, but because they shuddered at divine honour being paid to men. Their own words show this: it is no guess of ours; for the text of the book goes on to say how they were moved....Just then, as good men forbade those who had wished to worship them as gods, and wish rather that God alone be worshipped, God alone be adored, to God alone sacrifice be offered, not to themselves; so also all the holy Angels seek His glory whom they love; endeavour to impel and to excite to the contemplation of Him all whom they love: Him they declare to them, not themselves, since they are angels; and because they are soldiers, they study only how to seek the glory of their Captain; but if they have sought their own glory, they are condemned as usurpers. Such were the devil and his angels; he claimed for himself divine honour, and for all his demons; he filled the Pagan temples, and persuaded them to offer images and sacrifices to himself. Was it not better to worship holy Angels than devils? They answer: we do not worship devils; we worship angels, as you call them, the powers and the ministers of the great God. I wish ye would worship them: ye would easily learn from themselves not to worship them. Hear an Angel teaching. He was teaching a disciple of Christ, and showing him many wonders in the Revelation of John: and when some wonderful vision had been shown him, he trembled, and fell down at the Angel's feet; but that Angel, who sought not but the glory of God, said, “See thou do it not; for I am a fellow-servant of you, and of your brethren the prophets.” What then, my brethren? Let no man say, I fear lest the Angel may be angry with me, if I worship him not as my God. He is then angry with you, when you have chosen to worship him: for he is righteous, and loves God. As devils are angry if they are not worshipped, so are Angels angry if they are worshipped instead of God. But lest the weak and trembling heart perchance say unto itself: If then the demons are incensed because they are not worshipped, I fear to offend them; what can even their chief the devil do unto you? If he had any power over us no one of us would remain. Are not daily so many things said against him by the mouth of Christians, and yet the harvest of Christians increases. When you are angry with the most depraved of your slaves, you give him the name, “Satan,” Devil. Perhaps in this thou dost err, since you say it to a man, and your immoderate anger hurries you to revile the image of God: and yet you choose a term thou deeply hatest, to apply to him. If he could, would he not revenge himself? But it is not allowed: and he does so much only as is allowed him. For when he wished to tempt Job, he had to ask power to do so: and he could do nothing had he not received power. Why then do you not fearlessly worship God, without whose will no one hurts you, and by whose permission you are chastened, not overcome? For if it shall have pleased the Lord your God to permit some man to hurt you, or some spirit: He will chasten you, that you may cry unto Him: “Confounded,” therefore, “be all they that delight in vain gods: worship Him, all you His angels.” Let Pagans learn to worship God: they wish to worship Angels: let them imitate Angels, and worship Him who is worshipped by Angels. “Worship Him, all you His angels.” Let that Angel worship who was sent to Cornelius (for worshipping Him he sent Cornelius to Peter), himself Peter's fellow-servant; let him worship Christ, Peter's Lord. “Worship Him, all you gods!”
11. “Sion heard of it, and rejoiced”. What did Sion hear? That all His Angels worship Him....For the Church was not as yet among the Gentiles; in Judæa the Jews had some of them believed, and the very Jews who believed thought that they only belonged to Christ: the Apostles were sent to the Gentiles, Cornelius was preached to; Cornelius believed, was baptized, and they who were with Cornelius were also baptized. But ye know what happened, that they might be baptized: the reader indeed has not reached this point, but, nevertheless, some recollect; and let those who do not recollect, hear briefly from me. The Angel was sent to Cornelius: the Angel sent Cornelius to Peter; Peter came to Cornelius. And because Cornelius and his household were Gentiles, and uncircumcised: lest they might hesitate to give the Gospel to the uncircumcised: before Cornelius and his household were baptized, the Holy Spirit came, and filled them, and they began to speak with tongues. Now the Holy Spirit had not fallen upon any one who had not been baptized: but upon these It fell before baptism. For Peter might hesitate whether he might baptize the uncircumcised: the Holy Spirit came, they began to speak with tongues; the invisible gift was given, and took away all doubt about the visible Sacrament; they were all baptized....What did Sion hear, and rejoice at? That the Gentiles also had received the word of God. One wall had come, but the corner existed not as yet. The name Sion is here peculiarly given to the Church which was in Judæa. “Sion heard of it, and rejoiced: and the daughters of Judah were glad.” Thus it is written, “The apostles and brethren that were in Judæa heard.” See if the daughters of Judæa rejoiced not. What did they hear? “That the Gentiles had also received the word of God.”...Therefore, “The daughters of Judah rejoiced because of Your judgments, O Lord.” What is, because of Your judgments? Because in any nation, and in any people, he that serves Him is accepted of Him: for He is not the God of the Jews only, but also of the Gentiles.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)