Who wrote "Other people see things and say: why? - but I dream things that never were and say: why not?"

Question

Of which book did its author say: “I cannot conscientiously recommend it for any useful purposes whatever. All I can suggest is that when you get tired of reading "the best hundred books," you may take this for half an hour. It will be a change.”?

Answer 1

George Bernard Shaw
These words were spoken by the serpent in "Back to Methuselah".