A passage from Cicero
Cicero, De Officiis I.5
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The noblest and most excellent part of philosophy is the study of duty. For it teaches us not only what we ought to do, but how to do it.
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.