If you ask how divinity is mingled with the human, it is time first to ask how the soul is naturally joined to the flesh. If you do not know the manner in which your own soul is united to the body, do not suppose that the other must necessarily fall within your comprehension. Here we believe the soul to be something distinct from the body because flesh separated from the soul becomes dead and inactive, yet we do not know the manner of their union. So there we confess that the divine nature differs, in incomparably greater majesty, from the mortal and perishable nature, while we are unable to comprehend the manner of the intermingling of the divine with the human. We do not doubt from the miracles that have been recorded that God came to be in human nature; but we refrain from investigating how, since this is beyond what reasoning can reach.
For neither, when we believe that all bodily and intelligible creation came into subsistence from the bodiless and uncreated nature, do we examine together with that faith the question from where or how. Rather, accepting that it came to be, we leave the manner in which the whole was constituted without prying into it, since it is altogether ineffable and beyond explanation.