52% sureThe sources checked so far agree on this one. The book or the speech it first came from hasn't turned up yet.
What turned up
Shakespeare, Henry IV, Part 1, Act 5, Scene 4 (Falstaff, after feigning death at the Battle of Shrewsbury): "The better part of valor is discretion." Written/first performed 1597, printed 1598 (Q1). The now-common phrasing reverses Shakespeare's original word order.
Work
Shakespeare, Henry IV Part 1
Occasion
1597 · Falstaff's line after feigning death at Shrewsbury
Sources checked
litcharts.comChecked using claude-sonnet-5, 21 August 2026Act 5 Scene 4 text and modern translation
Confirms original syntax vs. the commonly reversed modern phrasing
folger.eduChecked using claude-fable-5, 21 August 2026Folger edition, 1 Henry IV 5.4 (Falstaff): 'The better part of valor is discretion, in the which better part I have saved my life.' — earliest attestation of the sentiment, in reversed word order, confirmed by direct fetch
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