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undated quotes
                                    
1860s, Realist Manifesto' - an open letter, 1861
                                        
                                        as quoted in Post-Impressionism, From Van Gogh to Gauguin, John Rewald, Museum of Modern Art, New York, 1956, p. 86 
undated quotes
                                    
                                        
                                        Letter to Munshi Hargopal Tafta, 17/18 July, 1858 
Quotes from Letters
                                    
Source: The Social Function of Science (1939), p. 415-416. Chapter XVI. THE SOCIAL FUNCTION OF SCIENCE. The Transformation of Science
                                        
                                        Quote from Breaking Bounderies.., Robert S. Mattison, exhibition catalogue Whitney Museum, 1994, p. 3 
1990's
                                    
                                        
                                        Quote, 1850's explaining to Champfleury and the writer Francis Wey; as cited on Wikipedia; Masanès, Fabrice 2006, p. 31 
Courbet explains in his quote the start of his painting 'Stone-Breakers' [painted in 1849-50 / destroyed in the Allied Bombing of Dresden in 1945]; this painting was inspired by a scene Courbet witnessed on the roadside. 
1840s - 1850s
                                    
The Tragic Sense of Life (1913), VIII : From God to God
                                        
                                        As quoted in 'From my rotting body, flowers shall grow, and I am in them, and that is eternity', Potter P. Emerg Infect Dis, 2011 
after 1930
                                    
Letter to Emily Sartain (1886-03-25). Frank Stephens was Eakins' brother-in-law.
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        