As quoted in Debussy (1989) by Paul Holmes, p. 36 
Context: Music would take over at the point at which words become powerless, with the one and only object of expressing that which nothing but music could express. For this, I need a text by a poet who, resorting to discreet suggestion rather than full statement, will enable me to graft my dream upon his dream — who will give me plain human beings in a setting belonging to no particular period or country. … Then I do not wish my music to drown the words, nor to delay the course of the action. I want no purely musical developments which are not called for inevitably by the text. In opera there is always too much singing. Music should be as swift and mobile as the words themselves.
                                    
“Music is a means capable of expressing dark dramatism and pure rapture, suffering and ecstasy, fiery and cold fury, melancholy and wild merriment – and the subtlest nuances and interplay of these feelings which words are powerless to express and which are unattainable in painting and sculpture.”
"The Power of Music" (1964), translated in Music Journal, September 1965, p. 37.
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Dmitri Shostakovich 32
Russian composer and pianist 1906–1975Related quotes
Source: Anam Cara: A Book of Celtic Wisdom
                                        
                                        Quote, 1970's; from the documentary 'Gerhard Richter - Painting', Corrinna Belz, 2011 
1970's
                                    
                                        
                                        Igor Stravinsky (1936). An Autobiography, p. 53-54. 
1930s
                                    
“Music is the pure expression of one's soul.”
                                        
                                        Original: (it) La musica è la pura espressione della propria anima. 
Source: prevale.net
                                    
                                        
                                        Quote of Mondrian, c. Oct. 1917; as cited in Letters of the great artists, Richard Friedenthal, Thames and Hudson, London, 1963 (transl. Daphne Woodward), p. 237 
1910's
                                    
                                        
                                        Quote 
Source:  Famous phrase of Eugenio Cruz Vargas http://www.angelred.com/urls/arte.htm| 
Source:  Sky  http://viaf.org/viaf/13641853/| 
Source:  From Library of Congress Name Authority File of U.S.A. http://id.loc.gov/authorities/names/n81126660.html|
                                    
                                        
                                        Quote from Denis' Journal, 1930; as cited on  Wikipedia: Maurice Denis https://en.wikipedia.org/wiki/Maurice_Denis - reference [43] 
1921 and later