Literature is full of coincidences, which some love to believe are plagiarisms. There are thoughts always abroad in the air which it takes more wit to avoid than to hit upon.
Source: In Instant Quotation Dictionary, by Donald O. Bolander, 1979.
-- Oliver Wendell Holmes, (Aug 29 1809-1894), US poet, essayist, scholar; He was noted for witty and warmly humane sketches; First Dean Harvard Med Sch, 1847-53.