“The Greek writer, Aristotle, quoted some centuries before Christ from ‘the African,’ probably some Carthaginian writer on agriculture, the now familiar saying, ‘the best manure for the land is the foot of the owner.’ This homely word long attributed to Dr. Franklin, who stole it for his ‘Poor Richard’s Almanack’ more than a century ago, is based on the sound principle, that personal supervision to be most effective must be limited in its sphere, and that the best agricultural skill becomes weak when it attempts to exhibit itself on too broad a surface. Because a man can cultivate 100 acres better than any of his neighbors, it does not prove that he will cultivate 50 acres additional to them better than a neighbor of inferior skill, who is the owner of these 50 and no more.”
Arthur Latham Perry, Principles of Political Economy (1891).