A passage from Seneca
Seneca, Consolation to Helvia 10.1
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No one can be happy who looks to himself alone. The greatest consolation in trouble is the thought that we are not suffering alone, and that others have borne as much and more.
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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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.