A passage from Seneca
Seneca, On the Shortness of Life 13
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When you see a person always in his robes, either in the house or in the forum, beset by many clients, you may be sure that he is not busy with the affairs of others but his own.
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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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'