The writer is delegated to declare and to celebrate man's proven capacity for greatness of heart and spirit — for gallantry in defeat — for courage, compassion and love. In the endless war against weakness and despair, these are the bright rally-flags of hope and of emulation.
I hold that a writer who does not passionately believe in the perfectibility of man, has no dedication nor any membership in literature.

Nobel Prize acceptance speech (1962)