I'm quite happy to see this kind of thread on Apug but I'm quite aware of the sentence Plato wrote over the doors of its academy: "Let no one destitute of geometry enter my doors".
The fact that the language used by those philosophers is the natural language does necessary mean it is accessible to the profanes like me. It requires a lot of effort to understand the concepts involved here however you teased my curiosity enough to read the books of R. Barthes and Van Lier!