I painted it in Berlin [self-portrait 'The Drinker'], while screaming military convoys were passing beneath my window day and night.
In a letter from the sanatorium in Köningstein, Taunus, to Gustav Schiefler, 12 November 1916; as quoted in Expressionism, de:Wolf-Dieter Dube; Praeger Publishers, New York, 1973, p. 46