Paul Westheim: Wilhelm Lehmbruck, Gustav Kiepenheuer Verlag, Potsdam-Berlin 1919, S. 61,
Wilhelm Lehmbruck Zitate und Sprüche
Wilhelm Lehmbruck: Zitate auf Englisch
“Sculpture is the essence of things, the essence of nature, that which is perpetually human.”
As quoted in Expressionism (2004) by Norbert Wolf and Uta Grosenick, p. 64
As quoted in The Art of Wilhelm Lehmbruck (1972) by Reinhold Heller