What exactly does it mean that we "have the language to know"? And how do you prove it? How does the cog's reply in my last comment not match your definition an

What exactly does it mean that we "have the language to know"? And how do you prove it? How does the cog's reply in my last comment not match your definition and proof? In my experience, when you try to define and prove it in a way that is not fuzzy, you come up with a definition that also matches the cog.