Fanaticism turns into a means of salvation, enthusiasm into epileptic ecstasy, politics becomes an opiate for the masses, a proletarian eschatology; and reason veils her face.
Source, in full
On German fascism, in "An Appeal to Reason" ["Deutsche Ansprache. Ein Appell an die Vernunft"] in Berliner Tageblatt (18 October 1930); as translated by Helen T. Lowe-Porter in Order of the Day, Political Essays and Speeches of Two Decades (1942), p. 57