Constipation of Imagination

You see things; and you say “Why?” But I dream things that never were; and I say “Why not?”
GEORGE BERNARD SHAW, Back to Methuselah, act I, Selected Plays with Prefaces, vol. 2, p. 7 (1949). The serpent says these words to Eve.

Robert F. Kennedy used a similar quotation as a theme of his 1968 campaign: “Some men see things as they are and say, why; I dream things that never were and say, why not.”