To what Extent Does the Nature of Language Illuminate the Difference Between Knowledge of Ourselves and Knowledge of Others?

More than any other thing, the use of language sets humankind
apart from the remainder of the animal kingdom. There is some
debate as to where the actual boundary between language and
communication should be drawn, however there seems to be no
debate as to the nature of Language, which is to communicate, using
abstract symbols, the workings of one mind to one or more others
with a relatively high degree of accuracy. It could perhaps be said
that we are all capable of expressing or representing our thoughts
in a manner that is only meaningful to ourselves. …