Long ago I added to the true old adage of "What is everybody's business is nobody's business," another clause which, I think, more than any other principle has served to influence my actions in life. That is, What is nobody's business is my business.
Clara Barton (1821–1912), U.S. Civil War nurse and founder of the American Red Cross. As quoted in Angel of the Battlefield, ch. 13, by Ishbel Ross (1956).
In a letter dated March 7, 1888, written to orator Robert G. Ingersoll (1833-1899), urging him to speak on behalf of the residents of Mount Vernon, Illinois, whose town had been ravaged by a tornado the month before.