 Hans Heinrich Schaeder (1896–1957) and Hans Leisegang saw Gnosticism as an amalgam of eastern thought in a Greek form.Hans Jonas (1903–1993) took an intermediate approach, using both the comparative approach of the "Religionsgeschichtliche Schule" and the existentialist hermeneutics of Bultmann.Jonas emphasized the duality between God and the world, and concluded that Gnosticism cannot be derived from Platonism.