says:
"No, just because I don't have an explanation of the physical universe it doesn't follow that my materialism posits a brute fact. And even if did posit a brute fact, I don't see any reason why there can't be any brute facts."
I don't either. The "brute fact" that I start with is something like
reality exists. It's just kind of a given in my thinking, based on the evidence of my life. The thing that has always struck me (and motivated my interest in philosophy) is that
reality is profoundly mysterious. The job of philosophy and science are to try to understand it.
Terms like "physical universe" and "materialism" create difficulties. What is the distinction between "physical" and "non-physical"? "What is "matter" and what is "materialism" really asserting?
I guess that materialism originated in the idea that the only thing that exists is tangible "stuff", not unlike the tables and the chairs. So we got
those 17'th century theories of mechanistic materialism where reality consists of hard little unchanging lumps like billiard balls and that all change is the result of the dynamical motions of those atoms.
Physicalism seems to be an extension of materialism that holds that reality consists of nothing beyond the inventory of current physical theory. So objects only have physical properties, things like spatial-temporal location, mass, size, shape, motion, hardness, electrical charge, magnetism, and gravity. What's more, all of reality can be understood in terms of those kind of concepts. So reality need not be restricted to little lumps of physical matter (and time and space, I guess), but can also includes things like fields (and even spooky quantum entanglement). A difficulty that arises there is that we can't really know the outermost boundaries of 'physical' conception, what may or may not be posited by future physics.
I suppose that the best justification for a belief like this might be epistemological. Our windows to reality around us seem to be our senses. So one might want to argue that reality only consists of those things that we can know, either directly through our senses or indirectly by inference from sensory information. Empiricism may or may not embody that idea. Unfortunately, there doesn't seem to be any good argument for why reality has to be limited to what can be known by beings like us.
So I'm inclined to think that while empiricism is reasonably good justification for the heuristic of methodological naturalism in the physical sciences, it's perhaps weaker as an ontology.
Purple Pond says:
"You cannot prove anything using only a dictionary. I repeat you cannot wholly trust the dictionary. People use words incorrectly and their meanings are often added to the dictionary."
I couldn't agree more. The first thing they tell students studying philosophy at the university level is don't try to philosophize by quoting dictionary definitions. Besides, anyone who has studied the philosophy of religion knows that scholars have been trying to define the word 'religion' for well over a century, without notable success. So I'm hugely skeptical that a dictionary editor is in any position to solve philosophical problems simply by fiat, problems that philosophers (and theologians and anthropologists) have been arguing about for generations.