How does Saint John describe the triumph of the overcomers and the commissioning of the seven angels with the golden vials of wrath in Apocalypse 15?

Saint John beholds another great and marvelous sign in the heavens: seven angels bearing the seven final plagues, in which the wrath of God is completed and brought to its fullness. He sees what appears to be an expanse like a sea of glass mingled with radiant fire. Standing upon this crystalline sea are the triumphant overcomers who conquered the beast, his idolatrous image, and the number of his name. Bearing the harps of God, these victorious saints raise the ancient song of Moses, God’s faithful minister, joined with the victory hymn of the Lamb, chanting in adoration: They call God’s works great and wonderful and his ways just and true, address him as King of ages, ask who shall not fear and magnify him, and declare that he alone is holy and all nations shall come and adore because his judgments are manifest.

Following this triumphant hymn, John watches as the celestial sanctuary—the temple of the tabernacle of the testimony in heaven—is thrown open. From within the temple emerge the seven angels entrusted with the seven plagues. They are clothed in pure, dazzling white linen and girded across the chest with golden bands. One of the four living creatures hands to the seven angels seven golden vials filled to the brim with the wrath of the living God, who abides forever and ever. Immediately, the heavenly temple is filled with billowing smoke proceeding from the majestic glory and power of God. The divine presence is so awe-inspiring that no one is able to enter into the temple until the seven plagues administered by the seven angels are completely fulfilled.