The sequence Quote Investigator ↗ documents: 1870, the nearest real Emerson precursor, from his essay “Courage” — “He has not learned the lesson of life who does not every day surmount a fear”; May 1907, Elbert Hubbard in The Philistine — “Abolish fear and every man and woman is an orator and an artist”; December 1917, the thematic precursor in The Spatula; 3 June 1936, the Los Angeles Times advertisement crediting Elbert Hubbard, wording “more men”; March 1937, a second advertisement — in the Evening Sun of Baltimore, for the Granville B. Jacobs course — again crediting Hubbard, with no Carnegie involvement at all; November 1937, a Carnegie column crediting Napoleon Bonaparte; March 1941, a Carnegie column crediting “the late Elbert Hubbard”; 1954, Walter Lowen’s How and When to Change Your Job Successfully, which already carries the modern “more people…any other one thing in the world” wording with no author at all; 1962, The Quick and Easy Way to Effective Speaking, crediting Emerson; 1987, James K. Van Fleet’s Hidden Power, repeating the Emerson credit.
The 1954 citation is the telling one. A writer using the saying with no attribution — simply as something “truthfully said” — is a sign the line was already common property, floating free of any author, which is what makes a famous name so easy to staple onto it later.