I wish to play with human feeling, with its 'morbidity' in a cold and ferocious manner. Only very recently I have become a sort of gravedigger of art (oddly enough, I am using the very terms of my enemies). Some of my latest works have been coffins and tombs. During the same time I succeeded in painting with fire, using particularly powerful and searing gas flames, some of them measuring three to four meters high. I use these to bathe the surface of the painting in such a way that it registered the spontaneous trace of fire. 
Quote from Klein's 'Chelsea Hotel Manifesto', 1961; from the Yves Klein Archives - archived from the original on 15 January 2013; as cited on Wikipedia: Yves Klein 
After the opening of his unsuccessful exhibition at Leo Castelli's Gallery, New York 1961, Klein stayed with Rotraut Uecker (fr) at the Chelsea Hotel for the duration of the exhibition. While there, he wrote the 'Chelsea Hotel Manifesto', a proclamation of the 'multiplicity of new possibilities' 
1960 -1964
                                    
“Despite the hundreds of attempts, police terror and the concentration camps have proved to be more or less impossible subjects for the artist; since what happened in them was beyond the imagination, it was therefore also beyond art and all those human values on which art is traditionally based.”
            Page 251. 
The Savage God (1971)
        
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Al Alvarez 5
English poet, novelist, essayist and critic 1929–2019Related quotes
                                        
                                        Quote in his article 'Elementarism', as cited in De Stijl – Van Doesburg Issue, January 1932, pp. 17–19 
1926 – 1931
                                    
Source: For the Discovery of a Zone of Images', Piero Manzoni, 1957, pp. 16-17
                                        
                                        Paris 1923 
As quoted by Marius de Zayas, in 'The Arts', New York, May 1923 
Quotes, 1920's, "Picasso Speaks," 1923
                                    
                                        
                                        Abstract 
Outlines of a Philosophy of Art, 1925
                                    
                                        
                                        Letter to H. E. Kramer, 25-10-1926, as quoted in: Bram van Velde, A Tribute, Municipal Museum De Lakenhal Leiden, Municipal Museum Schiedam, Museum de Wieger, Deurne 1994, p. 44 (English translation: Charlotte Burgmans) 
1920's
                                    
The Social History of Art, Volume I. From Prehistoric Times to the Middle Ages, 1999, Chapter I. Prehistoric Times
                                        
                                        Quoted in Albert Jay Nock, Memoirs of a Superfluous Man (1943), p. 175. 
Attributed