Merry Christmas everyone!
I have nothing profound to say for Christmas, so here is a bit of philosophy. The Logos became a human being. He existed eternally, but only from around 4 BC was he a human being. Here is an interesting philosophical conclusion one can draw from this: Being human is not always a modally essential property of a human being, where a modal essential property of x is one that x cannot lack. For the Logos has the property of being human, but it was possible for him not to have this property.
This raises an interesting question. Is humanity a modally essential property of us? If yes, then the same property can be modally essential in one being but not in another. This isn't very surprising. (If we allow disjunctive properties, it's easy to come up with such properties. Thus, an electron modally essentially has the property of being a non-elephant or weighing 7000 pounds. It is possible for an elephant to have this disjunctive property, but it will not have it essentially--if it gains or loses weight, it'll lose the property.)
Suppose not. That would have the following interesting consequence: We could hold on to Aquinas' idea that when the body is dead and only the soul is alive after death and before the resurrection, the human being does not exist, while at the same time accepting that we will exist at that time, reduced to a soul.
But I suspect that we are modally essentially human, unlike the Logos. So I have to give a different story about the resurrection. I actually think it's possible to be a human being without a body, though this is a severely defective state.