Employ the people in forced labor at seasonable times. This is an ancient and excellent rule. Employ them in the winter months when they are at leisure, but not from Spring to Autumn, when they are busy with agriculture or with the mulberry trees (the leaves of which are fed to silkworms). For if they do not attend to agriculture, what will there be to eat? If they do not attend to the mulberry trees, what will there be for clothing?