A passage from Seneca
Seneca, Letters to Lucilius Letter 88
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The soul should know whither it is going and whence it came, what is good for it and what is evil, what it seeks and what it avoids, and what is that Reason which distinguishes between the desirable and the undesirable.
Related passages
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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.'
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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.