Living Poor by Moritz Thomsen, Page 261

To work harder a man has to eat better; to eat better had has to produce more; to produce more he has to work harder. And all of this is predicated on a growing knowledge of nutrition, basic hygiene, and the causes of the diseases that ravage his body; an understanding of agriculture and a respect for new farming techniques, new seeds, new ways to plant, new fertilizers, new crops.