A passage from Seneca
Seneca, On Providence 6.6
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What need is there to weep over parts of life? The whole of it calls for tears. But if you are wise, you will not weep for what is inevitable.
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.