A passage from Epictetus
Epictetus, Discourses IV.10
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When you are in company, observe what are the things that you are naturally inclined to talk about. Are they the things that concern the body, or those that concern the soul? If they concern the body, you are not yet a philosopher.
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.'