Page "Idealism" Paragraph 47

Johann Fichte was the first German philosopher to make an attempt at a presuppositionless theory of knowledge, wherein nothing outside of thought is assumed to exist apart from the primordial analysis of the Ego.

So that his philosophy could be solely grounded in itself, he assumed nothing without his Fichtean deductions from first principles, and elaborated what he called a Wissenschaftslehre.

Fichte denied Kant's noumenon and held that consciousness constitutes its own foundation, that the mental life of the Ego, of pure selfhood, relies upon nothing wholly external to itself and that the hypothesis of an outer world of any kind is the same thing as admitting a Kantian realm.