Philosophical thinking of a given epoch will concentrate different aspects of its work in one central concept which will then appear in the history of philosophy as substance,cogito, Absolute Spirit, negativity, the thing-in-itself, etc. Without their philosophical problematique, these concepts would of course be empty. The historian who would sever solutions from problems would also transform the history of philosophy and of philosophical thinking into a senseless collection of petrified artifacts. He would turn the dramatic arena of truth into a wasteland of dead categories.