A passage from Chrysippus
Chrysippus, Fragments (in Diogenes Laërtius) Lives 7.90
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The end is to live according to nature, that is, according to the nature of man and the nature of the universe, doing nothing which is forbidden by the common law.
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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.
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It is a man's special privilege to love even those who wrong him.