Tricky
Briefly immortal
Matter is defined as what things are made of and it has very specific properties. You can define it with a different word if you like, but it's going to have the same properties as matter, so your point would be moot. "The mind" and "God" have much less specific defintions, and while some "philosophers" might like to claim that they are the "ultimate substance", I don't think E=(God)c^2 is going to make it into many textbooks.The question is for hardcore materialists who do speak as if this "ultimate substance" was the goal of scientific endeavors. At every opportunity they state that "everything is material", that "there are no immaterial things", that the mind "is made of matter" and such kind of statements.
And although I consider myself a "hardcore materialist" I have never overly concerned myself with the search for the "ultimate substance". I'm going to have to start reading the flyers more carefully.
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