Infinite, Eternal, and Unchangeable in His Being We have affirmed that God as spirit is a substantive entity who is personal and noncorporeal. But this description, while it may distinguish God from the corporeal human creature, fails to distinguish God from angels who are also noncorporeal, personal entities. (This fact illustrates the point that no word is self-defining; every word must be sufficiently qualified to distinguish its referent from other things.) So the next thing that the Catechism