To All: Detailed pickings of Aquinas' First Way #1: Parmenides
NOTE: THIS IS LESS OF A DEBATE THREAD AND MORE OF AN EXPLANATORY THREAD, FOR EASY LATER REFERENCE. THE AIM OF THIS THREAD IS TO GIVE READERS PROPER UNDERSTANDING OF THE ARGUMENT, NOT NECESSARILY TO DEBATE ITS TRUTH VALUE.
I've created an infographic on Aquinas' First Way of Proving the Existence of God, but it ends up causing more confusion than understanding. So I'm gonna take it nice and slow, in multiple parts. Hopefully each part will be brief with little cause for confusion. There are several prerequisites required before a proper understanding of the argument can be grasped.
We start at the beginning, in pre-Socratic Greek philosophy.
How to Account for Change
Things around us seem to change: rivers flow, trees grow, animals move, the sun burns. But despite this, other things seem to stay the same: the person's matter changes completely every few years but they remain the same person, the Acheron flows but it remains in place, and so on.
Parmenides had a solution to this:
Parmenides
Everything is permanent, and nothing changes. Any apparent change is just an illusion, much like it is an illusion that the sun goes around the Earth.
He divided the world into two: being and non-being. Things either exist, or they don't. For being to change, it must be changed by something else, but the only thing other than being is non-being, and non-being cannot do anything. Therefore, despite appearances, nothing is changing.
This Concludes #1
The important point is that Parmenides divided the world into being and non-being, and that as a result, nothing can change. But surely our common sense intuition is not THAT bad, is it? Surely things like the natural sciences presuppose that things change, don't they?
Aristotle agreed that things do change, and his solution to Parmenides will be seen in #2, where he accepts the division of being and non-being, but further divides being into two pieces of its own.
Posted Jan 12, 2012, 7:19 PM UTC · edited
If you don't mind, I'd like to offer some countering analysis that should put Aquinas to rest if this is what he is basing his arguments on.
Analysis: This is basically correct. At the most basic level, all of these describe energy changing form, although Parmenides could not have known that.
Analysis: This, however, doesn't work with modern physics. Even a stone that seems to have sat unchanged for a thousand years is actually undergoing change, albeit slowly. The phraseology is interesting, by the way. "...other things seem to stay the same..." To our perceptions, yes, but not in actuality. I am fearful that some equivocation from things that seem to stay the same to things that actually stay the same will occur here.
Because of his (completely understandable) lack of knowledge regarding energy and matter, Parmenides has this exactly backwards. It is stasis that is an illusion.
Analysis: This works only if two assumptions are allowed:
If Parmenides' idea of "non-being" is accepted, then arguments that build on it are acceptable as well, even if he got change wrong. But that's a very big "if."
We shall see what is built upon it in #2.
I didn't bring up Heraclitus because I wanted to keep it brief and simple. But he said that EVERYTHING changes, and nothing is permanent. "You can't step into the same river twice", is the famous quote from him.
As long as we're bringing up extra pre-Socratic philosophers, I think Democritus' name should be somewhere in the comments of your reference post:
He was dismissed by Socrates, Plato, and Aristotle; but it turns out he was less wrong than anyone following their unfortunately dominant school of thought; less wrong than anyone else for thousands of years.
But that isn't directly relevant to the First Way. I'm not trying to provide a history of Western philosophy, here.
It doesn't offer commentary on the First Way. But it does show how Western philosophy took a regrettable wrong turn, early on. If Democritus' ontology had dominated, we probably would've had chemistry and such much earlier, and the Aquinas might have been a physicist or followed some other productive pursuit, instead of writing the Ways.
Yup, I'm familiar with it. I just want to be sure there won't be any equivocation or incoherence associated with the word "change."
I'm not sure if I should bring up Aristotle's form and matter solution as well. That's part of his solution: the matter changes, but the form stays the same (or at least holds for a period of time). It's important, but not directly to germane to the First Way.
Decisions...
Eschew unnecessary complications. I see no reason to go into Aristotle if it's not germane to the argument.
This depends entirely on the semantics of the word "river". You make no point effectively because you can both never step into the same river twice as well as easily step into the same river twice. If one wants to use the specific meaning of the word river that would make Heraclitus' quote true, then articulate it as such.
IMO, there are two reasons you don't do this:
I think even you will catch on to this some day.
Is it really correct? We are talking about "things" consisting of atoms. The atoms do not change but move, they change velocity and position. All of this from energy changing form, trickling down the energy landscape and moving between states and locations, as you correctly point out.
This is however an continuous process with no distinctive end and start points, unless we freeze time and movement. Correct again.
Addition to remember At the same time the building blocks, the atoms don't change, unless in extreme environments.
Seems seems to be the key word here.
Wouldn't you say "movement" and "change" are analogous at that level? Go small enough, it's all just energy.
True but then I don't think we are saying that "things change".
Movement do not change "things", as atoms. It's just energy, passing by.
Water do not change in "essence" by freezing to ice. It's just at a temporary position at higher temperature (movement). Water seem to change in "essence" by freezing to ice but this is from our viewpoint.The water atoms are the same, the water have changed configuration but has not changed in essence.
So, things do not change on atomic level.
Neither do movement. Change is only movement passing by but movement in essence do not change (energy conservation), only the distribution of movement change over time.
I hope this made sense, I'm thinking as I write.
To be fair, he's reporting on what pre-Socratics thought, not proposing it as an idea we should adopt. It is indeed true that there was a large school of pre-Socratic philosophers who thought change was an illusion. This was centuries before even the first primitive atomic theory, and millennia before the modern one.
Absolutely agreed, it's an interesting thought construction in itself and in comparison with current knowledge.
Parmenides tries to understand the role of change and energy in the universe. it would be rude to him to not appreciate his efforts and put it in context.
Except that even the atoms change. Take water for instance. At any one point a small percentage of water molecules turn into acid and base counterparts, forming hydroxide ions and protons (which being unstable rapidly join another water molecule to become hydronium ions). The properties of these ions are very different than those of water, but their number is small, and the change is reversible, back and forth between these two forms. This process involves electrons shifting back and forth, which means the atoms themselves change as electrons are doneated and accepted.
Precisely! Yes, I admit, I kept it simple, deliberately. and stopped at atomic level. But we can as well take it down to proton, electron, electron level and say that these do not change. in themselves.
But your (very good) point is important due to the nature of change we are talking about here. The concept of thermodynamic equilibrium:
Change is continuous, back and forth, admitting no continued displacement from the systems chemical potential. Electrons are interchanged between molecules, without the essence of the atoms being changed, There is no hysteresis, change is not retained. The ambiguous properties of the hydrogen atom, being both ion and H2 is an essential property of hydrogen. It's current state do not change that property.
Conclusion: 1. The essential properties of the hydrogen atom do not change with energy passing by (within non-nuclear energy interactions) 2. Apparent change do not stop or start, it moves back and forth, while not altering essential properties of the building blocks of the universe. 3. Energy changes location. Essence of energy (net movement) never change though.
I actually don't know if all this is important for the Thomistic first way. We have to wait and see.