We know there are Angels and Archangels, Thrones, Dominions, Princedoms, Powers, Splendors, Ascents, Intelligent Powers or Intelligences, pure natures and unalloyed, immovable to evil, or scarcely movable; ever circling in chorus round the First Cause (or how should we sing their praises?) illuminated thence with the purest Illumination, or in one degree or another, proportionally to their nature and rank...so conformed to beauty and molded that they become secondary Lights, and can enlighten others by the overflowings and largesse of the First Light. Ministrants of God's Will, strong with both inborn and imparted strength, traversing all space, readily present to all at any place through their zeal for ministry and the agility of their nature...
Whenever we enter the church and draw near to the heavenly mysteries, we ought to approach with all humility and fear, both because of the presence of the angelic powers and out of the reverence due to the sacred oblation; for as the Angels are said to have stood by the Lord's body when it lay in the tomb, so we must believe that they are present in the celebration of the Mysteries of His most sacred Body at the time of consecration.