"In science, you must not talk before you know. In art, you must not talk before you do. In literature, you must not talk before you think...
Science: The knowledge of things, whether Ideal or Substantial.
Art: The modification of Substantial things by our Substantial Power.
Literature: The modification of Ideal things by our Ideal Power."
John Ruskin, Deucalion - King of the Golden River and the Eagle's Nest, 1872, p. 303
