The spirit of a man is the most valuable thing in the world.

I do not know what I may appear to the world， but to myself I seem to have been only like a boy playing on the sea-shore， and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary， whilst the great ocean of truth lay all undiscovered before me.

"The best ideas come when you're not trying to have ideas."

爱是一切问题的答案。