When thou wishest to delight thyself, think of the virtues of those who live with thee; for instance, the activity of one, and the modesty of another, and the liberality of a third, and some other good quality of a fourth. For nothing delights so much as the examples of the virtues, when they are exhibited in the morals of those who live with us and present themselves in abundance, as far as is possible. Wherefore we must keep them before us.