PLP:
If there are things other than the Material Universe, can we have any knowledge at all about them?
Sure. A past moment in time is no longer in the universe, but we have knowledge about it.
PLP:
Is belief in things other than the Material Universe rationally justifiable?
Let’s set aside the term “Material Universe” and use a more basic term. How about using “universe” to mean the stars, planets, and space containing them, within the range of human visibility, at one particular moment.
- Perhaps it is overly obvious, but “tomorrow” is not part of the universe today, and yet it is rationally justifiable to believe in.
- A newly married couple have no children, but it is rationally justifiable that in a few years they may have some.
- Chemical reactions unite elements into new compounds that were previously not part of the universe.
In other words, some things not part of the universe come into being somehow. Therefore, we cannot limit ourselves to believing that what currently exists in the universe is
all that exists.
So in considering the universe in the context of “existence”, one must be careful not to project into it what one anticipates will soon be there, as if it were already there. (Don’t count your chickens before they’re hatched). Since we do not now see those new things, and nothing is moving towards producing them, then they are not actually part of the universe, and may never be.
But through the agency of people, new children arrive, and new chemical compounds are formed. And through the agency of something else, a new day arrives, and the next moment of time is given to all.
PLP:
If you deny that the Material Universe and Everything that Exists are not good ontological descriptions, the First Cause arguments simply collapse into incoherence.
I don’t see how. The “First Cause” argument is not a “One-Time Cause” argument.
It is or should be “there exists a first cause for everything that did not always exist”, meaning it can be somehow traced back to that which has always been. To do this requires actual instances.
For example, anything that is composed of something else is clearly something that did not always exist. This can be shown by an actual instance: a water molecule is composed of two hydrogen atoms and one oxygen atom; a hydrogen atom is composed of proton and electron; and a proton is composed of three quarks. So while the water molecule did not exist before the proton, neither could the proton exist before the quark. And the quark is itself subject to further analysis (I haven’t read up on it lately).
So we can safely say that water did not always exist, because it is composed of something else. And we can even say protons did not always exist, for the same reason.
This and related logic can be applied and correlated to other things to gain insight about “existence” in general.
PLP:
hurst:
For example, would you say “humanity” is the composition of all humans?
Sure, why not?
Perhaps you misunderstood me. By composition I meant the collection or set of actual humans.
But it isn’t the actual collection of them, but only a reference to them collectively.
But perhaps other example will show what I mean.
Would you say sharpness is the collection of all sharp objects?
PLP:
Well, if we define the entity that is me personally as a four-dimensional entity with some invariant or meta-invariant essential properties, then it’s not quite so problematic.
But is it realistic? You do not understand or know your future self.
Does inserting “t” into 4D mathematical formulas equate to reality? (despite that it can be used to simulate inanimate things fairly well)
PLP:
Still and all, pointing to imprecision, vagueness, and ambiguity in ontological speech simply strengthens the conclusion that First Cause arguments, by employing such vague speech, do not constitute a reason to disbelieve Scientific Materialism. If we can’t talk about the Material Universe as an entity at all, we cannot find it lacking in critical properties.
Do we really need to consider the entire universe as a whole all at once?
Doesn’t it suffice to consider a single molecule, or the birth of a single person, or the consideration of the change in moments of time? I find it enlightening to see these in contrast to “total nothingness”.
hurst