Revelation 15:6

From there, the seven angels, he says, came out. For where else should the heavenly ministers of God be seen as coming forth but from the heavenly temple?

And he says they had in their hands seven plagues which they would pour out upon the earth. For many signs will occur on the earth in the time of the end; of these even Christ recalled in the Gospels, teaching concerning the end (Mark 13).

But that the angels are clothed in a bright, pure stone turns out to be a sign of their honor and of a nature that is pure and luminous and steadfastly inclined toward the good, if indeed they were clothed with Christ. For the Lord is called a stone by divine Scripture, as by Isaiah: "Behold, I lay in Zion a precious, chosen stone in the foundations" (Isa. 28:16); and by the prophet: "The stone which the builders rejected has become the head of the corner." (Ps. 118:22) That the stone be put on, and the wisest Paul exhorts us likewise: to "put on our" stone "Jesus Christ, and make no provision for the desires of the flesh" (Rom. 13:14); for he who has put this on is outside all soul-destroying desires. And as for those living, their practical matters and stability are hinted at; for it has been said concerning them that, "they are mighty, doing His word with strength."

The hidden secrets of the testimonies foretold concerning Christ and the church are now revealed. [The seven angels with the seven plagues] are the church against which a hostile portion rebelled through unending treacheries. Therefore it says that plagues come out, either for the defense of the saints in whom the Lord Christ earlier had suffered abuse, as he said to Paul, “Saul, Saul, why do you persecute me?” or, as James noted, the time of judgment begins with the household of God. To be sure, persons will be scourged in a twofold manner, so that the just God might punish their sins, as in the case of Pharaoh, or that he might test their virtues by a greater trial, as in the case of Job. And therefore we read concerning him, “The Lord has tested me, as gold that passes through fire; I have kept his ways, and I have not departed from the commandments of his lips.” The number of the angels and the plagues prefigures the universal extent of the consummation, as it says often in Leviticus, “I will smite you with seven plagues.” “They are clothed in pure white linen.” Mortification is often indicated by a linen garment. If, then, the blameless judgments of God are recognized in that which is white, the sense is aptly applied also to these pure linen garments, so that those who are mortified are made snow-white by this whiteness, when they behold the glory of God at the revelation of his judgments. “They were girded with golden girdles.” Scripture teaches that gold signifies wisdom, as it says, “Receive wisdom as gold.” And it is rightly around the breast, where according to the law the priest is often commanded to wear the logium, that is, what is intellectual, so that his mind is well aware of divine things and does not despise them but rather praises the divine judgments and by the brightness of the gold on him also urges others to praise them unhesitatingly.

The seer says that a “tent” was in heaven, and it was according to the likeness of this tent that God commanded Moses to build the tabernacle below. He says that from this temple angels proceeded out, dressed in “pure linen” or, as some copies have it, in a “pure stone.” Their dress indicates the purity of their natures and the proximity that they have to Christ, the Cornerstone, and the brightness of their virtue. The phrase “girded with golden girdles” refers to the power and the purity and the honor of their nature and to the freedom they have in their works of service.

And the seven angels came out, having the seven plagues from the temple. This is what Mark says: But they went out and preached everywhere.

Clothed in pure bright linen. As many (the Apostle says) as were baptized into Christ have put on Christ (Gal. III). For He is the supreme cornerstone chosen. Or if you understand the singular number for the plural, it signifies various ornaments of virtues. Another translation has white linen, indicating the mortification of the heart for teachers, according to that: I discipline my body and bring it into subjection, lest when I have preached to others, I myself should become disqualified (I Cor. IX).

And girded around their chests with golden belts. Whoever wants to preach strong things should not only mortify the body but also gird the chest with the gold of wisdom. Or certainly to gird the chest with golden belts is to restrain all the movements of mutable thoughts with the bonds of God's love alone.