A passage from Zeno of Citium
Zeno of Citium, Fragments (in Diogenes Laërtius) Lives 7.156
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The wise man is the only good general, the only good orator, the only good poet, and the only good king. For all these arts require virtue.
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.