10. What kind of value would a field have, even though it is the best soil, if you sow thousands of different kinds of seeds mingled among each other simultaneously? The seeds will germinate properly; but to what use for the sower? In truth, the yield of this field will scarcely be usable as a poor feed for cattle! The stronger plants will suffocate the weaker ones, the weeds will proliferate, and the wheat grain will only here and there grow very sparsely and meagerly!
11. From this, however, it appears that wherever you would want to have some benefit, an order must be accomplished, without the thorns, thistles, herbage, and turnips among it, which can no longer be of any use to you.