50. THE SUBSTANCE OF THE ANGELS
1. Creatures exist in a series of grades. They participate and represent the goodness of God in various ways. In the world about us, there are three kinds of substances: mineral, vegetal, animal. These are all bodily substances. We find also in this world the human substance which is mineral, vegetal, and animal, and yet is something more; it is not all bodily; man has a spiritual soul. To round out the order of things, there must be some purely spiritual or nonbodily substances. Thus created substances are: the completely bodily substance, the substance that is a compound of body and spirit, and the completely spiritual substance. Completely spiritual substances are called angels.