Russell797
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The conjunction of the last two statements works out to logical equivalence. I would read it as "nature iff detectable." In other words, nature is all and only what is detectable. I suppose on the one hand that's good epistemic advice: you shouldn't believe in what is, in principle, undetectable. But this is methodological advice only--I would also say that you shouldn't believe that everything that exists is detectable (especially to creatures like us).
We have no reason to believe everything which exists is detectable. Anything which objectively exists outside of nature (the supernatural) may not be detectable. Everything which is natural to our particular universe is detectable.
For instance, we can not know the inside of a black hole or even if it really has an inside. The 'inside' of a black hole is cut off from our universe, and is not a part of our space-time. The singularity if there is such a thing has no size or dimensionality. It takes up zero space in zero time. If that seems to makes no sense that is because it does not make sense. It is irrational. The same things applies to the supernatural. It's irrational.....even if in some sense it objectively does exist, we simply can not know it. There is no possible means of communication much the same as is the case with the 'inside' of a black hole or a singularity, even if it were a naked singularity.
Not known by whom? I know that things considered supernatural are real. I have detected them. Plenty of other people have as well.
Not known by anyone. You don't know the supernatural. You by necessity have presumed something not in evidence about whatever it is you are referring to.
.I disagree. We can detect non-physical stuff--specifically, we can detect mental stuff
You can not detect non-physical 'stuff'. You can detect matter and you can detect signals propagated by the force carrying particles. Mental 'stuff' is not supernatural, it's a real consequence of interactions between bits of matter and flowing energy. In science we term something like that an emergent characteristic, where the whole can be greater than the sum of the parts.