Respectfully Quoted: A Dictionary of Quotations. 1989.
Carl Sandburg (18781967)
Who put up that cage? Who hung it up with bars, doors? Why do those on the inside want to get out? Why do those outside want to get in? What is this crying inside and out all the time? What is this endless, useless beating of baffled wings at these bars, doors, this cage?
CARL SANDBURG, Money, Politics, Love and Glory, The Complete Poems of Carl Sandburg, rev. and expanded ed., p. 394 (1970).