John Ruskin 
The Two Paths [EPUB ebook] 

The following addresses, though spoken at different times, are intentionally connected in subject; their aim being to set one or two main principles of art in simple light before the general student, and to indicate their practical bearing on modern design. The law which it has been my effort chiefly to illustrate is the dependence of all noble design, in any kind, on the sculpture or painting of Organic Form.
This is the vital law; lying at the root of all that I have ever tried to teach respecting architecture or any other art. It is also the law most generally disallowed.