It may also be said that the Apostle wishes to prove that Christ is greater than the angels who were chosen as the messengers of the law; in order that He might show the excellence of the new over the old law. Hence there is no need to apply this to any other angels besides those who were sent to give the law.
Reply to Objection 2: According to Dionysius (Coel. Hier. xiii), the angel who was sent to purify the prophet's lips was one of the inferior order; but was called a "Seraph," that is, "kindling " in an equivocal sense, because he came to "kindle" the lips of the prophet. It may also be said that the superior angels communicate their own proper gifts whereby they are denominated, through the ministry of the inferior angels. Thus one of the Seraphim is described as purifying by fire the prophet's lips, not as if he did so immediately, but because an inferior angel did so by his power; as the Pope is said to absolve a man when he gives absolution by means of someone else.
Reply to Objection 3: The Divine Persons are not sent in ministry, but are said to be sent in an equivocal sense, as appears from what has been said (Q[43], A[1]).
Reply to Objection 4: A manifold grade exists in the Divine ministries. Hence there is nothing to prevent angels though unequal from being sent immediately in ministry, in such a manner however that the superior are sent to the higher ministries, and the lower to the inferior ministries.
Whether all the angels who are sent, assist?
Objection 1: It would seem that the angels who are sent also assist. For Gregory says (Hom. xxxiv in Evang.): "So the angels are sent, and assist; for, though the angelic spirit is limited, yet the supreme Spirit, God, is not limited."
Objection 2: Further, the angel was sent to administer to Tobias. Yet he said, "I am the angel Raphael, one of the seven who stand before the Lord" ( Tob. 12:15 ). Therefore the angels who are sent, assist.
Objection 3: Further, every holy angel is nearer to God than Satan is. Yet Satan assisted God, according to Job 1:6 : "When the sons of God came to stand before the Lord, Satan also was present among them." Therefore much more do the angels, who are sent to minister, assist.
Objection 4: Further, if the inferior angels do not assist, the reason is because they receive the Divine enlightenment, not immediately, but through the superior angels. But every angel receives the Divine enlightenment from a superior, except the one who is highest of all. Therefore only the highest angel would assist; which is contrary to the text of Dan. 7:10 : "Ten thousand times a hundred thousand stood before Him." Therefore the angels who are sent also assist.
On the contrary, Gregory says, on Job 25:3 : "Is there any numbering of His soldiers?" (Moral. xvii): "Those powers assist, who do not go forth as messengers to men." Therefore those who are sent in ministry do not assist.
I answer that, The angels are spoken of as "assisting" and "administering," after the likeness of those who attend upon a king; some of whom ever wait upon him, and hear his commands immediately; while others there are to whom the royal commands are conveyed by those who are in attendance---for instance, those who are placed at the head of the administration of various cities; these are said to administer, not to assist.
We must therefore observe that all the angels gaze upon the Divine Essence immediately; in regard to which all, even those who minister, are said to assist. Hence Gregory says (Moral. ii) that "those who are sent on the external ministry of our salvation can always assist and see the face of the Father." Yet not all the angels can perceive the secrets of the Divine mysteries in the clearness itself of the Divine Essence; but only the superior angels who announce them to the inferior: and in that respect only the superior angels belonging to the highest hierarchy are said to assist, whose special prerogative it is to be enlightened immediately by God.
From this may be deduced the reply to the first and second objections, which are based on the first mode of assisting.
Reply to Objection 3: Satan is not described as having assisted, but as present among the assistants; for, as Gregory says (Moral. ii), "though he has lost beatitude, still he has retained a nature like to the angels."
Reply to Objection 4: All the assistants see some things immediately in the glory of the Divine Essence; and so it may be said that it is the prerogative of the whole of the highest hierarchy to be immediately enlightened by God; while the higher ones among them see more than is seen by the inferior; some of whom enlighten others: as also among those who assist the king, one knows more of the king's secrets than another.
Whether all the angels of the second hierarchy are sent?
Objection 1: It would seem that all the angels of the second hierarchy are sent. For all the angels either assist, or minister, according to Dan. 7:10 . But the angels of the second hierarchy do not assist; for they are enlightened by the angels of the first hierarchy, as Dionysius says (Coel. Hier. viii). Therefore all the angels of the second hierarchy are sent in ministry.
Objection 2: Further, Gregory says (Moral. xvii) that "there are more who minister than who assist." This would not be the case if the angels of the second hierarchy were not sent in ministry. Therefore all the angels of the second hierarchy are sent to minister.
On the contrary, Dionysius says (Coel. Hier. viii) that the "Dominations are above all subjection." But to be sent implies subjection. Therefore the dominations are not sent to minister.
I answer that, As above stated (A[1]), to be sent to external ministry properly belongs to an angel according as he acts by Divine command in respect of any corporeal creature; which is part of the execution of the Divine ministry. Now the angelic properties are manifested by their names, as Dionysius says (Coel. Hier. vii); and therefore the angels of those orders are sent to external ministry whose names signify some kind of administration. But the name "dominations" does not signify any such administration, but only disposition and command in administering. On the other hand, the names of the inferior orders imply administration, for the "Angels" and "Archangels" are so called from "announcing"; the "Virtues" and "Powers" are so called in respect of some act; and it is right that the "Prince," according to what Gregory says (Hom. xxxiv in Evang.), "be first among the workers." Hence it belongs to these five orders to be sent to external ministry; not to the four superior orders.
Reply to Objection 1: The Dominations are reckoned among the ministering angels, not as exercising but as disposing and commanding what is to be done by others; thus an architect does not put his hands to the production of his art, but only disposes and orders what others are to do.
Reply to Objection 2: A twofold reason may be given in assigning the number of the assisting and ministering angels. For Gregory says that those who minister are more numerous than those who assist; because he takes the words ( Dan. 7:10 ) "thousands of thousands ministered to Him," not in a multiple but in a partitive sense, to mean "thousands out of thousands"; thus the number of those who minister is indefinite, and signifies excess; while the number of assistants is finite as in the words added, "and ten thousand times a hundred thousand assisted Him." This explanation rests on the opinion of the Platonists, who said that the nearer things are to the one first principle, the smaller they are in number; as the nearer a number is to unity, the lesser it is than multitude. This opinion is verified as regards the number of orders, as six administer and three assist.
Dionysius, however, (Coel. Hier. xiv) declares that the multitude of angels surpasses all the multitude of material things; so that, as the superior bodies exceed the inferior in magnitude to an immeasurable degree, so the superior incorporeal natures surpass all corporeal natures in multitude; because whatever is better is more intended and more multiplied by God. Hence, as the assistants are superior to the ministers there will be more assistants than ministers. In this way, the words "thousands of thousands" are taken by way of multiplication, to signify "a thousand times a thousand." And because ten times a hundred is a thousand, if it were said "ten times a hundred thousand" it would mean that there are as many assistants as ministers: but since it is written "ten thousand times a hundred thousand," we are given to understand that the assistants are much more numerous than the ministers. Nor is this said to signify that this is the precise number of angels, but rather that it is much greater, in that it exceeds all material multitude. This is signified by the multiplication together of all the greatest numbers, namely ten, a hundred, and a thousand, as Dionysius remarks in the same passage.