II. (8) First of all, therefore, the husbandman is not anxious to plant or to sow anything that is unproductive, but only all such things as are worth cultivation, and as bear fruit, which will bring a yearly produce to their master man. For nature has pointed him out as the master of all trees and animals, and all other things whatever which are perishable; (9) and what can man be but the kind that is in every one of us, which is accustomed to reap the advantage from all that is sown or planted? But since milk is the food of infants, but cakes made of wheat are the food of fullgrown men, so also the soul must have a milk-like nourishment in its age of childhood, namely, the elementary instruction of encyclical science. But the perfect food which is fit for men consists of explanations dictated by prudence, and temperance, and every virtue. For these things being sown and implanted in the mind will bring forth most advantageous fruit, namely, good and praiseworthy actions. (10) By means of this husbandry, all the trees of the passions and vices, which soot forth and grow up to a height, bringing forth pernicious fruits, are rooted up, and cut down, and cleared away, so that not even the smallest fragment of them is left, from which any new shoots of evil actions can subsequently spring up. (11) And if, besides, there are any trees which produce no fruit at all, neither good nor bad, the husbandman will cut them down too, but still he will not suffer them to be completely destroyed, but he will apply them to some appropriate use, making them into stakes and fixing them as pales all round his homestead, or using them as a fence for a city to serve instead of a wall.