A passage from Epictetus
Epictetus, Discourses I.3
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If any one trusted your body to the first man who met you, you would be indignant; but you entrust your own mind to chance and to any one who happens to meet you, and allow it to be disturbed and put in confusion by the mere first word. Are you not ashamed of this?
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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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.