Letter 72 — On Business as the Enemy of Philosophy (§7)

“I shall tell you what I mean by health: if the mind is content with its own self; if it has confidence in itself; if it understands that all those things for which men pray, all the benefits which are bestowed and sought for, are of no importance in relation to a life of happiness; under such conditions it is sound. For anything that can be added to is imperfect; anything that can suffer loss is not lasting; but let the man whose happiness is to be lasting, rejoice in what is truly his own.”