Jonti
what the dormouse said
That seems to be what we find, emprically. The answer seems to be "by enabling an inner voice".How?
But do empirical results have anything to offer in this context, a context of Pure Philosophy? That would be to assume knowledge; but we are trying to decide whether the very idea is coherent, not do some kind of scientific investigation.
I'm happy to do natural philosophy myself; and am also fascinated by the philosophy of science. So I'm happy to look at how things are. To look and see what is the fate of a human, if that person has never had the opportunity to develop language.