To complicate (or simplify?) things further, I'd like to assert that not only is the Logos of God the Ratio (the standard of judgment that reason must submit to), but it is also the Radix (the root of human reason itself).
If someone wants to discuss when the human spirit is first present with the human soul, well, that's a different kettle of fish. Mormons apparently believe the spirit isn't with the soul/body at implantation embryo stage since men like Orrin Hatch contend there is no human being yet if the alive embryo is in a petri dsh and there is only a human being when implantation occurs in a human female's womb. One wonders what Orrin will babble when shown the evidences of alive human embryos allready attached to extra-corporeal uterine tissue as in the experiemnts already carried out at Harvard. But that too is a different kettle of fish.