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1930s
                                    
            Quote of Nolde, 1906 in Jahre der Kämpfe (The years of struggles); as cited by Francesco Mazzaferro in  'The Diaries of Paul Klee' - Part Three: Klee as a Secessionist and a Neo-Impressionist Artist http://letteraturaartistica.blogspot.nl/2015/05/paul-klee-ev.html 
1900 - 1920
        
                                        
                                        In a letter to William Milliken (1930), quoted in Portrait of an Artist: A Biography of Georgia O'Keeffe, Laurie Lisle (1981), p. 128 
1930s
                                    
                                        
                                        both quotes in a letter to William M. Milliken, New York November 1, 1930; as quoted in Voicing our visions, – Writings by women artists; ed. Mara R. Witzling, Universe New York, 1991, p. 227 
1930s
                                    
                                        
                                        Quote, Jan. 1921, to journalist Marcel Pays. Monet in the 20th Century, by Paul Hayes Tucker. 
1920 - 1926
                                    
“Nothing in the whole world is of interest to me but my painting and my flowers.”
                                        
                                        his remark, shortly after the death of his second wife Alice in 1911; as quoted in: K.E. Sullivan Monet: Discovering Art, Brockhampton press, London (2004), p. 76 
1900 - 1920
                                    
Quote of Mondrian about 1905-1910; in 'Mondrian, Essays' ('Plastic art and pure plastic art', 1937 and his other essays, (1941-1943) by Piet Mondrian; Wittenborn-Schultz Inc., New York, 1945, p. 10; as cited in De Stijl 1917-1931 - The Dutch Contribution to Modern Art, by H.L.C. Jaffé http://www.dbnl.org/tekst/jaff001stij01_01/jaff001stij01_01.pdf; J.M. Meulenhoff, Amsterdam 1956, p. 40
                                        
                                        1950 
Source: 1946 - 1953, "Song of herself"; interviews by Olga Campos, Sept. 1950, Chapter 'My Painting', p. 73
                                    
“My paintings [c. 1907] were aglow with colors and so my soul was contended with them.”
                                        
                                        1900 - 1935 
Source: Expressionism: A Revolution in German Art, Dietmer Elger, Taschen, 2002, p. 166
                                    
Source: 1969 - 1980, In: "Ellsworth Kelly: Works on Paper," 1987, p. unknown : 'Notes from 1969'
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        