I understand, sorry. Well, The angels are represented throughout the Bible as a body of spiritual beings intermediate between God and men: “You have made him (man) a little less than the angels” (Psalm 8:6). They, equally with man, are created beings; “praise ye Him, all His angels: praise ye Him, all His hosts . . . for He spoke and they were made. He commanded and they were created” (Psalm 148:2-5; Colossians 1:16-17). That the angels were created was laid down in the Fourth Lateran Council (1215). The decree “Firmiter” against the Albigenses declared both the fact that they were created and that men were created after them. This decree was repeated by the Vatican Council, “Dei Filius”. We mention it here because the words: “He that liveth for ever created all things together” (Ecclesiasticus 18:1) have been held to prove a simultaneous creation of all things; but it is generally conceded that “together” (simul) may here mean “equally”, in the sense that all things were “alike” created. They are spirits; the writer of the Epistle to the Hebrews says: “Are they not all ministering spirits, sent to minister to them who shall receive the inheritance of salvation?” (Hebrews 1:14).
Probably the pre-eminent writer on angels was Thomas Aquinas. He spent a considerable amount of space in the Summa Theologiae, among other places, discussing the nature, activities and moral state of angels. Often, he would use the nature of the angels to illuminate the nature of human cognition by refering to angels as the extreme of what is possible for an intellectual nature to be. He also discusses them for their own sakes, but all the time keeping his remarks bound by the limits of the definitive teaching of Sacred Scripture, and by the rigors of consistent thinking.
Thomas gives an argument that the perfection of the universe requires the existence of intellectual creatures. Since God intends the good for His creation, he intends that it be like Himself. And since an effect is most like its cause when it shares with it the feature whereby it was caused, God’s creation must contain something with intellect and will since that is how God creates, i.e. by first knowing it and loving it into being.
Hence the perfection of the universe requires that there should be intellectual creatures. Now to understand cannot be the action of a body, nor of any corporeal power… Hence the perfection of the universe requires the existence of an incorporeal creature. (ST Ia 50, 1)
However, since humans are intellectual creatures, as he indicates at the end of this very argument, the need for some intellectual creatures is not sufficient to give us knowledge of the existence of purely intellectual creatures which the angels are.
Since Sacred Scripture does speak definitively about the existence of angels, it belongs to Sacred Doctrine, i.e. theology, to treat of angels in a truly scientific manner. The divine science has the intellectual tools (faith in Scripture) to establish both the fact of angels and their nature (ST Ia, 1, 3). Having accepted on faith that angels exist, or taking their existence to be purely hypothetical, one can still draw certain philosophical conclusions about their nature. Thomas’ words in the Summa are an excellent guide for how one can think clearly about the angelic hosts.
For Thomas, given that angels are intellectual creatures, they must be pure spirit, i.e. self-subsistent forms. They are completely incorporeal; they are in no way material, and have no bodies of any kind.(Ia 50, 2) Some, Franciscan theologians of the 13th century (St. Bonaventure among them), believed that angels, like everything other than God, were composed of matter and form. These thinkers, holders of the theory of “universal hylemorphism” as it was called, believed that, whereas sensible things in the world around us had corporeal matter, angels had spiritual matter. For Aquinas, the idea of spiritual matter was a complete confusion. If a thing is spiritual, then, insofar as it is spiritual, it is not material in the sense that it is not composed of matter. (Even though humans are both spiritual and material, their spiritual soul is not composed of spiritual matter and form as the Franciscan believed.)