Fichte did not endorse Kant's argument for the existence of noumena, of "things in themselves", the supra-sensible reality beyond direct human perception. Fichte saw the rigorous and systematic separation of "things in themselves" (noumena) and things "as they appear to us" (phenomena) as an invitation to skepticism. Rather than invite skepticism, Fichte made the radical suggestion that we should throw out the notion of a noumenal world and accept that consciousness does not have a grounding in a so-called "real world". In fact, Fichte achieved fame for originating the argument that consciousness is not grounded in outside of itself. The phenomenal world as such, arises from self-consciousness; the activity of the ego; and moral awareness. His student (and critic), Arthur Schopenhauer, wrote: