93% sureThese words were traced back to where they first appeared. That source is listed below.
What turned up
Recorded by Giorgio Vasari, Lives of the Artists (trans. Mrs. Jonathan Foster) — Michelangelo's answer when Pope Julius II demanded to know when the Sistine ceiling would be done.
Work
Vasari's Lives of the Artists (Michelangelo), trans. Mrs. Jonathan Foster
Occasion
1510 · the Sistine Chapel, Rome · Pope Julius II presses Michelangelo to hurry the ceiling; he refuses to rush his standards
Sources checked
en.wikisource.orgChecked using claude-sonnet-5, 21 August 2026fetched twice, exact wording confirmed consistently both times