Spinoza's metaphysics was a dual aspect monism. "Extended matter" = the material property of whatever the underlying reality is. And "realm of thought" = the mental property, of whatever the underlying reality is. The underlying reality is what unifies them into a monism. Spinoza was trying to undermine Descartes' metaphysical dualism, as well as replace traditional theism with a superior God (namely, nature itself). Marvelous thing to be doing at the time he was doing it... And while dual aspect monism might be true, his overall metaphysical system is a bit dated.What do you mean by “the transcendental realm of thoughts and ideas”? Is this an argument for metaphysical idealism? If so, present it.Nothing is supernatural. But nature itself is more than just the phenomenal realm of extended matter. It is also the transcendental realm of thought and ideas.
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