A passage from Diogenes Laertius
Diogenes Laertius, Lives of Eminent Philosophers 7.142
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The Stoics say that the wise man will marry and beget children, for these are things according to nature. But he will not be troubled if he has no children, for they are not in his power.
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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.'