Nobody has a good name in a bad mouth: The dangers of office gossip - Crystal Spraggins, SPHR, Payscale
In the 1918 novel The Magnificent Ambersons, written by Booth Tarkington and later adapted for the big screen by the great Orson Welles, Uncle Amberson counsels his irate nephew George that "Nobody has a good name in a bad mouth. Nobody has a good name in a silly mouth either." Read more here