A classic theological question is whether it was possible for one person of the Trinity to be simultaneously multiply incarnate. The question is particularly important if it turns out that there are other non-human rational animals--namely, aliens--in need of redemption.
Here is an argument for this possibility:
- An incarnation of a divine person is possible.
- If an incarnation of a divine person is possible, multiple sequential incarnations of one divine person are possible.
- If multiple sequential incarnations of one divine person are possible, multiple simultaneous incarnations of one divine person are possible.
- So, multiple simultaneous incarnations of one divine person are possible.
Premise (1) is this: according to revelation an incarnation is actual, hence it is possible. Premise (2) is, I think, quite plausible. After all, if an incarnation is possible, it would also be possible for this incarnation to come to an end--a divine person could become incarnate as a mortal being, which perishes qua that kind of mortal being. But then it is very plausible that another incarnation could follow. And so on.
That leaves premise (3). Here I have two lines of thought. The first is the intuition that since God is outside of time, it really shouldn't matter with respect to possibility whether multiple incarnations are in sequence or simultaneous--in each case, the multiple incarnations create a relationship between a timeless being and several locations of spacetime. The second involves time travel. Suppose that there are two sequential incarnations. Then the rational animal that results from the second incarnation could travel back in time and meet the rational animal that results from the first incarnation, and then there would be two simultaneous incarnations.