For those of you who are realist painters, I've found a site with many quotes from Paul Cezanne. Many of these can support your work.
One quote that has remained significant for me over many years is: "I want to make of impressionism something solid and lasting like the art in the museums" The Bords de la Marne (above) reflects his success in doing what he wanted although he certainly had his occasional doubts.
It's essential that a painter spend much time in the great museums. Louis Fiinkelstein, American Painter, 1923-2000, Professor emeritus in the art department of Queens College, City University of New York, spoke of his "being a child of the Metropolitain" Yes, what wonderful parenting for Louie; just as the Louvre was for Cezanne.