Rev 8:2

“In the seven angels we shall recognize again the church according to that rule that indicates that universality is often to be acknowledged in the number seven. [The church] is said to have received a most powerful trumpet of proclamation by which she is strong and by which, we believe, every age comes to faith. For we read, "Life up your voice like a trumpet."”

“And I saw seven angels standing before God, etc. The Church, often commended by the number seven, is devoted to the duty of preaching, the first trumpet signifying the common destruction of the impious by fire and hail; the second, the devil expelled from the Church, more fervently inflaming the sea of the world; the third, heretics falling away from the Church, corrupting the rivers of the Holy Scripture; the fourth, the downfall of false brethren in the obscuration of the stars; the fifth, the greater infestation of heretics preceding the time of the Antichrist; the sixth, the open war of the Antichrist and his followers against the Church, and, by recapitulation from the coming of the Lord, the insertion of the destruction of the same adversary; the seventh, the day of judgment, when the Lord will render the reward to His own and will destroy those who have corrupted the earth.”

“And I saw seven angels standing in the sight of God; and there were given to them seven trumpets. And another angel came, and stood before the altar, having a golden censer. In this place he upsets the order of the narration and interposes something; for, as the following will show, the angel with the censer came and stood before the altar before they received the seven trumpets. He interposes something because he introduced this angel with the censer in the middle before he had finished talking about the others. So, what do we understand by the seven angels but the holy Church in its preachers, who are the announcers of eternal life? It is also right for them to be said to be seven in number, because they are filled up with the sevenfold Spirit, or because they are put in charge of the totality of believers. They are said to be standing in the sight of God because they have trodden earthly desires underfoot and stick to divine contemplation. What is shown by their seven trumpets but the perfect preaching of the Old and of the New Testament? According to this: Lift up thy voice like a trumpet. [Is. 58:1] By the fact that it is the office of a priest to stand by the altar and burn incense prepared with spices, we realize that this angel is the Mediator between God and men, the Angel of the seven angels, and, so to speak, the Pontiff of the seven priests, he about whom the prophet said, angel of great counsel. [Is. 9:6 acc. to LXX, where the verse is number 5.] From this we clearly gather that he came before the seven angels received the trumpets. By the altar are represented the elect, in whom a spiritual sacrifice is being performed. So, the angel came by the flesh, and stood by the divinity. Also, what is represented by the censer but Christ's humanity? It is appropriate for it to be called golden, because the flesh assumed by the Word of God is, together with him, the wisdom about which it is said, Take wisdom as gold. [Variant of Prov. 16:16] The censer, in which spices are burned, may also symbolize the Church, which says every day, kindled by the fire of divine love, Let my prayer be directed as incense, etc. [Ps. 140:2] Then it is rightly said after that concerning Christ alone: And there was given to him much incense, that he should offer of the prayers of the saints upon the golden altar, which is before the throne. And the smoke of the incense of the prayers of the saints ascended up before God from the hand of the angel. Just as smoke comes out of burned spices, so is the virtue of devotion produced by zeal for prayer. However, in order for the incense to become pleasing to God, it is given to the angel, which means that the zeal of prayers is entrusted to our Redeemer. The body is totally unable to speak to God but by the agency of the Head. The fact that the incense is offered on the golden altar shows that the sacrifice of prayers is accepted by him nowhere else but in the body of Christ, all of which shines with the wisdom of the divine Word. Note also that the throne and the altar before the throne do not signify two Churches, but one, just like Noah's ark and the eight souls in it. [Cf. Gen. 6; 1 Peter 3:20]”

“Then it is said that seven trumpets were given to the seven angels so that they might sound them as a king takes his place. With these same trumpets, the dead were also about to be awakened; for the wise apostle to the Thessalonians, writing about divine matters, says in the first epistle that "the Lord Himself will descend with a command, with the voice of an archangel, and with the trumpet of God." (1 Thess. 4:16) And again, he says, "for the trumpet will sound, and the dead will be raised incorruptible." (1 Cor. 15:52)”