We live in an age of science, which has enabled technological advancements unimaginable to our ancestors. Unlike philosophy, which depends somewhat on certain subjective values and one’s own sense of plausibility to settle questions, science poses questions directly to nature, in the form of experiments. Nature then answers by displaying certain behaviors, so questions can be settled objectively.
This is both science’s strength and its Achilles’ heel: experiments only tell us how nature behaves, not what it essentially is. Many different hypotheses about nature’s essence are consistent with its manifest behaviors. So although such behaviors are informative, they can’t settle questions of being, which philosophers call ‘metaphysics.’ Understanding nature’s essence is fundamentally beyond the scientific method, which leaves us with the—different—methods of philosophy. These, somewhat subjective as they may be, are our only path to figuring out what is going on.
Materialism—the view that nature is fundamentally constituted by matter outside and independent of mind—is a metaphysics, in that it makes statements about what nature essentially is. As such, it is also a theoretical inference: we cannot empirically observe matter outside and independent of mind, for we are forever locked in mind. All we can observe are the contents of perception, which are inherently mental. Even the output of measurement instruments is only accessible to us insofar as it is mentally perceived.
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