I espouse a slightly different interpretation of that quote, namely that unsatisfactory answers should spur underlying curiosity. In other words: "Oh, you doubt unicorns exist? Go find out."
However yours is an interesting one I hadn't considered.
I felt he was saying something simular to another of his quotes : 'Logic can get you from a to z, imagination can get you everywhere'
I. E I'd you want your kids to be intelligent don't teach them facts, heighten their imagination.