Context
Why the misattribution sticks
The saying captures a genuine truth about leadership and teaching — that trust precedes influence — so it feels like something a plain-spoken, big-hearted leader would say. Theodore Roosevelt, endlessly quotable and long dead, is the path of least resistance for any warm aphorism in search of a pedigree.
Its wording drifts from sighting to sighting (“People won’t care… unless they really know,” “People don’t care… until they know”), which is exactly how folk adages behave and exactly how fixed quotations do not.
A true saying in search of a famous author — and Roosevelt was the nearest one lying around.
The mid-century paper trail
Quote Investigator notes the phrasing was popularized in mid-20th-century sales and self-improvement circles — Beltone’s 1962 training manual and Zig Ziglar’s 1978 bestseller both carried it — long before it acquired a presidential signature online.