Most scholars agree that Bultmann is one of the "most influential theologians of the twentieth-century", but that he also had a "notorious reputation for his de-mythologizing" which was debated around the world. Demythologizing refers to the reinterpretation of the biblical myths (stories) in terms of the existential philosophy of Martin Heidegger (1889–1976). Bultmann claimed myths are "true" anthropologically and existentially but not cosmologically. As a major proponent of form criticism, Bultmann "set the agenda for a subsequent generation of leading NT Testament scholars".