Plutarch De exilio 3

[3] But let us grant (as many say and sing) that it is a grievous thing to be banished. So there are also many things that we eat, of a bitter, sharp, and biting taste, which yet by a mixture of other things more mild and sweet have all their unpleasantness taken off. There are also some colors troublesome to look upon, which bear so hard and strike so piercingly upon the sight, that they confound and dazzle it; if now by mixing shadows with them, or by turning our eyes upon some green and pleasant color, we remedy this inconvenience, thou mayst also do the same to the afflictions that befall thee, considering them with a mixture of those advantages and benefits thou still enjoyest, as wealth, friends, vacancy from business, and a supply of all things necessary to human life. For I think there are few Sardians but would desire to be in your condition, though banished, and would choose to live as you may do, though in a strange country, rather than—like snails that grow to their shells—enjoy no other good, saving only what they have at home without trouble.