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It is not possible because (1) whether a self-understanding is thus authorized depends on whether it is appropriate to ultimate reality in its structure in itself; (2) determining whether it is thus appropriate depends on determining this structure; and (3) determining this structure depends on  -- indeedon—indeed, is! --  doing —doing metaphysics.

Why? Because doing metaphysics is logically analyzing, and so determining, the structure of ultimate reality in itself.

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