I’d be lying if I said I didn’t see any problems with Thomas’ account of men and their individuation one form another, but I don’t see the problem you apparently see. For Thomas, in fact, the (primary) principle of individuation is prime matter, not the substantial form, because the substantial form is intrinsically the same (call it human-ness).
Alterum:
I know you were not speaking to me, but, I just had to jump in here. Primary matter is not Aquinas’ individuating principle. If either of these first two causes is the individuating principle,
Form is. Primary matter is the “subject,” i.e., a blank receptacle, so to speak, for the Form. In substantial change, primary matter is pure undifferentiation (chaos). Only in accidental change, may (secondary) matter be considered in its common meaning.
Two most common
mistakes concerning Aquinas’ concepts are: (1) assuming “matter” to be what in its common meaning refers to having weight and occupying space. That could be the subject of secondary matter, but not “primary matter.” The best definition he gives for “Primary matter” is simply, “that which is the subject of substantial change.” And, “subject” must not be narrowly taken in its modern meaning. It is kind of like the “
subject of a sentence,” in that it can be (almost) anything and as such is absolutely undifferentiated, rather than a specific “matter” or a matter that is specific to a particular owner, i.e., possessor. And, (2) assuming that
Form only means
shape or
figure.
Human-ness is the reification of our sense-data of “human being(s)”. It is called first order, or rather,
physical order, abstraction. In this order of abstraction, the the intellect, operating on the data presented to it by the senses dematerializes such data, in order to make things intelligible, then leaves aside what is called individual sensible matter but retains, in abstracted form, what is termed common or universal sensible matter. (
Summa Theologica, I, q. 85, a. 1, reply 2.)
What the mind reifies is the commonality of certain “human” determinants. For this it does not need Primary Matter or Form separated; it needs them precisely as we see them, as composites, or
compounds, if you will.
Again, this is why we are all human: we have the same substantial form.
We have “substantial form” because we are the results of “
substantial change.” For Aquinas, substantial change is a change of a
whole mobile being, yet there is some perduring subject (primary, or fundamental, matter) which remains throughout the change. What we as human beings have is a certain sameness of accidental characteristics, in reification terms, but we have very specific differentiation when it comes to our “boundaries.” My
boundary, i.e., separateness (from all others), is what confers “individuality.” The one
among the many. That is the result of substantial change. But here agin, please don’t take “boundary” in too narrow a meaning. It means such things as, personality, intelligence, and physical features.
If we’re staying with Thomas here (and it seems like we are), then the way you’re using ‘person’ seems to refer to the distinct prime matter which individuates this person (along with whatever accidental forms he possesses). So perhaps we could say that your name refers to (supposits for, if you want) you, but signifies your essence (human substantial form).
Our names in some imperfect way indicate our separation, our separateness, despite the occasional duplication. So, yes, your name “supposits” for you and signifies (points to) that essence that is your (and no one else’s) closest personal possession.
In conception, the ‘special creative act’ is simply the corruption of egg and sperm and generation of a human being.
I’m not so sure it is that “simple.” It’s not merely a “corruption” of gametes. And, it is more a
compound (rather than than a
mixture), i.e., a binding together of the material of the gametes. It is such a thorough compound(ing) that the result becomes quite different from either parental gamete. This is tough, because Aquinas never intended
primary matter to be conflated with
gametes. He never intended for us to make such explanations. But, since you are here doing this, let’s see if we can get it as right as we can.
God bless,
jd