For by no means do I require, nor am I warranted in requiring, cognition of this object of my idea as to what it might be in itself; for I have no concepts for that, and even the concepts of reality, substance, causality, indeed even necessity in existence, lose all meaning and are empty titles for concepts without any content when with them I venture outside the field of sense. — Critique of Pure Reason
Since all of our claims are mediated by concepts, and since concepts cannot apply to noumena, the implication is that we should not even be capable of making claims about noumena, even just to say that they are the kinds of things about which claims cannot be made. Because in order to utter such a claim, we will have had to have conceptualized noumena, per impossible. — Theorem
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