" The study of plant diseases for their own sake is proving an increasingly intricate game, to which modern scientists have devoted many wasted hours. Such studies would be amusing if they were not tragic, for no disease in plant, animal, or man can properly be viewed unless it is looked on as an interference with, or to speak more plainly, as the distortion or negation of that positive aspect of the growing organism which we call health. "

― Albert Howard , The Soil and Health: A Study of Organic Agriculture