Starting from a critical discussion of P. Forman's thesis about the influence of pessimistic and romantic attitudes on the development of mathematics and physics during the Weimar republic the paper investigates the relation between D. Hibert's and H. Weyl's positions in the foundations crisis of mathematics. H. Weyl's statement that the theoretical concepts of mathematics "are interwoven with the history of thinking and shall never be laid down as a dead final result" is seen as an attractive frame for a future philosophy of mathematics.