William Hazlitt, The Collected Works of William Hazlitt…
“ But in nature all this is brought about by necessary laws, and the effect is visible to those, and those only, who look for it in actual objects. This is the great and master-excellence of the Elgin Marbles, that they do not seem to be the outer surface of a hard and immovable block of marble, but to be actuated by an internal machinery, and composed of the same soft and flexible materials as the human body. The skin (or the outside) seems to be protruded or tightened by the natural action of a muscle beneath it. This result is miraculous in art: in nature it is easy and unavoidable. ”
