Who really said it
Not all readers are leaders, but all leaders are readers
The thought is genuinely Truman’s, but the sentence is not. What he actually put down was “Not all readers become leaders. But all leaders must be readers” — part of a longer note printed in Monte M. Poen’s edition of Truman’s unsent letters and desk notes ↗ and in Robert H. Ferrell’s edition of The Autobiography of Harry S. Truman ↗. The tidier “not all readers are leaders, but all leaders are readers” is a later smoothing that only turns up in books from the 1990s onward ↗, where it is credited to Truman, Zig Ziglar and John C. Maxwell more or less interchangeably.
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