There is no fuller passage to quote. Pappus preserves the line as a bare epigram, with no narrative around it — which is part of why it reads so cleanly, and part of why it can’t be traced further back. For the boast in context you have to go to Plutarch, who tells the story of King Hiero and the ship but renders the punchline in completely different words.
✓Public domain
Both halves of this are safely out of copyright. The Greek is Pappus’s, c. AD 340, and the standard scholarly text is Hultsch’s Pappi Alexandrini Collectionis (Berlin, 1876–78) — long in the public domain. The English wording shown closely follows Sir Thomas Heath’s rendering in Archimedes (1920) ↗, published well before 1931 and free at Project Gutenberg. The delta is one word each way: Heath has “a place to stand on… and I can move the earth”; the popular modern form drops the “on” and uses “I shall.” Neither is in copyright. One caution: not every translation of this line is free. F. R. Walton’s “Give me a place to stand and with a lever I will move the whole world,” from the Loeb Diodorus Siculus (1957), is a distinct and much later translation — quote that wording and you are quoting an in-copyright text, not this one.
⚠ This reflects the original work, which is public domain. If your exact English wording comes from a specific modern translation, that translation may itself still be under copyright — check the edition you quote.
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