Meditations 6.48

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.

Marcus Aurelius, Meditations 6.48, translated by George Long

When thou wouldst cheer thine heart, think upon the good qualities of thy associates; as for instance, this one's energy, that one's modesty, the generosity of a third, and some other trait of a fourth. For nothing is so cheering as the images of the virtues mirrored in the characters of those who live with us, and presenting themselves in as great a throng as possible. Have these images then ever before thine eyes.

Marcus Aurelius, Meditations 6.48, translated by C. R. Haines