A passage from Cicero
Cicero, De Finibus III.48
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The wise man is always happy, because he is always virtuous. External events cannot take away his virtue, and therefore cannot take away his happiness.
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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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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.