„In some cases we learn more by looking for the answer to a question and not finding it than we do from learning the answer itself.“
— Lloyd Alexander, libro The Book of Three
Origine: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964), Chapter 1
Contesto: "Why?" Dallben interrupted. "In some cases," he said, "we learn more by looking for the answer to a question and not finding it than we do from learning the answer itself."