[6.218.2] Firstly a sober thinker is guided by reason to it; for if the soul is the actual life principle of man in all his parts, it must be present in all parts of the body, since otherwise certain parts of the body would obviously not be alive and would be just as dead as the whole body is dead if the soul has left it. And as such the soul is, already based on the infallible reasons of a pure and healthy person, undoubtedly totally a person in spiritual substance and has its seat - nota bene - in the whole body.

[6.218.3] However, somebody could say: 'Yes, this sounds quite good; but where are the tangible proofs for it, which can only serve as long-lasting witnesses for the full truth of reason?'