As a civil servant, one should work tirelessly for the public and fulfill every duty.
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From the 《诗经·召南·采蘩》 (Classic of Poetry, ~1000 BCE): '被之僮僮,夙夜在公' — describing a noblewoman performing sacrificial duties from dawn to night. Later applied to any tireless public service.
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Highly formal and literary; mostly appears in official writing, eulogies, and political speeches.