A passage from Epictetus
Epictetus, Discourses 2.9.13
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How is it possible that a man who has nothing, who is naked, homeless, without a hearth, squalid, without a slave, without a city, can pass a life that flows easily? See, God has sent you a man to show you that it is possible.
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.'