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Thomists affirm theism, but God would be a counterexample to your proposition as stated: God is something "that exists" in Himself; He does not "exist by something [else]". Thomists' principle of sufficient reason (PSR) A more accurate statement of Thomists' version of PSR is (Philosophical Axiom 7.1): Everything has sufficient reason of being either in ...


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There isn't really a ubiquitous reading of the principle of sufficient reason (PSR), so I think it's worth going over some distinctions and different formulations. There are at least two major formulations of the PSR, and several sub-formulations of each of the two major formulations (my six below are by no means exhaustive). The first major formulation is ...


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