To say of a picture, as is often said in its praise, that it shows great and earnest labour, is to say that it is incomplete and unfit for view.
Source: The Gentle Art of Making Enemies, Propositions no. 2, 1890.
-- James McNeill Whistler, (Jul 10 1834-1903), US artist, author; He is known for his studies in color tone and famous for his Whistler's Mother painting.