Epictetus 3.22.45-49
And how is it possible for a man who has nothing, who is naked, without home or hearth, in squalor, without a slave, without a city, to live serenely? Behold, God has sent you the man who will show in practice that it is possible. "Look at me," he says, "I am without a home, without a city, without property, without a slave; I sleep on the ground; I have neither wife nor children, no miserable governor's mansion, but only earth, and sky, and one rough cloak. Yet what do I lack? Am I not free from pain and fear, am I not free? When has anyone among you seen me failing to get what I desire, or falling into what I would avoid? When have I ever found fault with either God or man? When have I ever blamed anyone? Has anyone among you seen me with a gloomy face? And how do I face those persons before whom you stand in fear and awe? Do I not face them as slaves? Who, when he lays eyes upon me, does not feel that he is seeing his king and his master?"