One of our readers asked:

I have read that occasionally if a zygote splits, it will sometimes join back together instead of going on to form twins. This rises an interesting, and currently unanswered question: since a human being is indivisible, how can you say that the split zygote has two souls if it splits and then rejoins? It would be illogical to say that if a zygote should split, but then rejoins that there were two souls which then became one.

I have no problem with the statement that human life begins at fertilization. But since fertilization is, as described in the article, a process, do we say that human life, or a human person, begins at fertilization? We talk about it like they are the same thing, but in order for the Church’s teaching to not be self-contradictory, they might be different. Otherwise, if a zygote, holding all the material of a human person, splits, then it’s two human persons. But what happens to that extra person if it rejoins? A zygote, split or unified, is definitely alive, but it would be weird to say that God is injecting a human soul into our bodies like a vaccine…just playing devil’s advocate here. You don’t have to agree with me, but somebody is going to need to get this clarified at some point.

Praise the Lord

Read the Whole Article at