  Coming at the notion another way, a change is real if and only if there is an absolutely or “broadly logically” possible world in which it is either the only event that occurs in an entire universe or else the sum of all events in a universe, while a change is a “logical parasite” if and only if this is not true of it. Consider Smith's kicking me. This looks like it could be the only occurrence in a universe. It is absolutely or “broadly logically” possible that the universe simply sits there wholly static, then Smith kicks me, then the universe winks out of existence before anything else happens. But actually, when we look more carefully, we see that in this case, the kick is not the only change. For it has parts which are shorter or spatially smaller changes. In the kick, for instance, Smith's leg first moves an inch, then another inch, etc., and each movement consists spatially of discrete movements by various muscles. The kick is not the only change, but in the odd universe I described, it is the sum of all changes in a universe. No change with parts can be the only change in a universe, strictly speaking. On the other hand, it is not logically possible that my becoming shorter than Smith in the way described occur alone or be a sum of all changes occurring in a universe. For it to occur, Smith's growth must also occur. And Smith's growth is not a part of it. So changes are real if and only if they are logically independent events in the world's history. If God cannot change really, then, nothing can so act on him as to change him, his actions do not change him, and no change in God could be the only event in a universe.  If God cannot change really, then if had there been nothing other than God, there would have been no change at all, of any sort.