 On the contrary, he asserts the existence of "eternal problems in philosophy"  and conceives their historical development as a unique, logically necessary, teleological process through which they progressively achieve more coherent and adequate formulations.Philosophical historiography, therefore, should not simply confine itself to registering the external philological characteristics of the doctrines under consideration without making value judgements about them.Its peculiar task is rather that of discerning in them the true from the false.