Again, I reckon it is the part of law and of right reason to assign to each one what is appropriate to him, and belongs to him, and falls to him. For as the lyre is only for the harper, and the flute for the flute-player; so good things are the possessions of good men. As the nature of the beneficent is to do good, as it is of the fire to warm, and the light to give light, and a good man will not do evil, or light produce darkness, or fire cold; so, again, vice cannot do aught virtuous. For its activity is to do evil, as that of darkness to dim the eyes.