A passage from Epictetus
Epictetus, Discourses 5
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The materials of action are variable, but the use we make of them should be constant. It is not in our power to choose the events, but it is in our power to choose our attitude towards them.
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.'