A passage from Zeno of Citium
Zeno of Citium, Fragments (in Diogenes Laërtius) Lives 7.87
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The end may be defined as life in accordance with nature, or, in other words, in accordance with our own human nature as well as that of the universe.
Related passages
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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.