Respectfully Quoted: A Dictionary of Quotations. 1989.
Edgar Albert Guest (18811959)
Somebody said that it couldnt be done, But he with a chuckle replied That maybe it couldnt, but he would be one Who wouldnt say so till hed tried. So he buckled right in with the trace of a grin On his face. If he worried he hid it. He started to sing as he tackled the thing That couldnt be done, and he did it.
EDGAR A. GUEST, It Couldnt Be Done, stanza 1, Collected Verse of Edgar A. Guest, p. 285 (1934).