A passage from Marcus Aurelius
Marcus Aurelius, Meditations 10.32
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Every man on the point of doing anything, let him ask himself, Is this one of the unnecessary things? Nor is it enough to remove unnecessary acts, but also unnecessary thoughts, for thus superfluous acts will not follow after.
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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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If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.