A passage from Epictetus
Epictetus, Discourses 3.22.9
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Look at me: I am without a home, without a city, without property, without a slave; I sleep on the ground; I have no wife, no children, no praetorium, but only the earth and heavens, and one poor cloak. And what do I want? Am I not without sorrow? Am I not without fear? Am I not free?
Related passages
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Men seek retreats for themselves, houses in the country, sea-shores, and mountains... But this is altogether a mark of the most common sort of men, for it is in thy power whenever thou shalt choose to retire into thyself.
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Take away thy opinion, and then there is taken away the complaint, 'I have been harmed.' Take away the complaint, and the harm is taken away.
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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'