R
Richca
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In the first proof for the existence of God in St Thomas Aquinas’ Summa Theologica, he proposes a few propostions to which I add a third namely:
Firstly, before anything can change, we must first have a being to change which we may call a substratum or substance of change.
Secondly, if change is real, a being of some kind, this is not going to be simple Being. For Being as Being, is one and simple and being simply one it does not have any composition of parts. The only contrary to being is non-being and non-being does not exist. Simple Being then is unchangeable for there is nothing for Simple Being to change into for it just is simply Being. If motion or change is a being of some kind, this does not apply to Simple Being, for it possesses the fullness of Being and you cannot add being to it.
Consequently, whatever is moved or changed must be composite and composed of at least two parts which in Aristotle’s terms are act and potency. As said above, before anything can change, we must first have something to change, namely, a being of some kind and for present illustrative purposes we can call this part of the being act. Before a being can change, it must have the potentiality to change and so lets can call this other part potency. So, we have a composite being composed of two parts, act and potency. The potential part is that part that can be changed.
- Whatever is moved is moved by another. (This wording is the wording in the SCG of Aquinas and is possibly the correct wording for the ST from what I read on another thread. The older English translation of the ST has “whatever is in motion is put in motion by another.” The newer English translation by Fr. Thomas Gilby has “anything in process of change is being changed by something else.” For the present discussion, I don’t think we need to dwell on which translation is the correct one. However, if somebody knows something that my affect our understanding of how we are to understand the first proposition, please enlighten us.)
- Motion is nothing else but the reduction of something from potentiality to actuality.
- I am going to propose another proposition which St Thomas does not expressly state but which I think can be inferred in the first proof, namely, whatever is moved or changed is divisible, i.e., it has a composition of parts at least two, namely, potency and act. In St Thomas’ commentary on Aristotle’s physics, book 7, he says: There cannot be a moveable object whose motion does not depend on its parts; just as if I were to show that a divisible thing cannot be the first being, because the being of whatever is divisible depends on its parts.” In this particular instance and without reading into this passage any further and which for the present purposes I don’t think really matter much, Aquinas may be talking about motion properly so called, i.e, a change in quality, quantity, or place wherein the substance or subject itself is not changed. However, Aristotle says in physics book VI, Lecture 5, chapter 4, “Everything that changes must be divisible.” This is universally true for any kind of change whatsoever in some manner or other; the mobile object is divisible. You can read Aquinas’ commentary on this. To simplify things presently, lets say that everything that is moved or changed must have a compostion of at least two parts which we are going to call potentiality and act, as its primordial composition as the first thesis of the 24 Thomistic theses states : Potency and Act so divide being that whatsoever exists either is a Pure Act, or is necessarily composed of Potency and Act, as to its primordial and intrinsic principles.
Firstly, before anything can change, we must first have a being to change which we may call a substratum or substance of change.
Secondly, if change is real, a being of some kind, this is not going to be simple Being. For Being as Being, is one and simple and being simply one it does not have any composition of parts. The only contrary to being is non-being and non-being does not exist. Simple Being then is unchangeable for there is nothing for Simple Being to change into for it just is simply Being. If motion or change is a being of some kind, this does not apply to Simple Being, for it possesses the fullness of Being and you cannot add being to it.
Consequently, whatever is moved or changed must be composite and composed of at least two parts which in Aristotle’s terms are act and potency. As said above, before anything can change, we must first have something to change, namely, a being of some kind and for present illustrative purposes we can call this part of the being act. Before a being can change, it must have the potentiality to change and so lets can call this other part potency. So, we have a composite being composed of two parts, act and potency. The potential part is that part that can be changed.