The impure men and women who surrounded me (and particularly the men), did not arouse any of my real feelings; while the natural feeling for life possessed by animals set in vibration everything good in me. [from the front of World War 1.].

In a letter to his wife, April 1915; as quoted in Artists on Art – from the 14th – 20th centuries, ed. by Robert Goldwater and Marco Treves; Pantheon Books, 1972, London, p. 444