Look at yourself from the space! You are very little, you are so tiny! But there is something big in you: Your great ideas! Even from the space they look big because they have the power to change the universe, to change the space!

And, if you'll investigate the history of science, my dear boy, I think you'll find that most of the really big ideas have come from intelligent playfulness. All the sober, thin-lipped concentration is really just a matter of tidying up around the fringes of the big ideas.