He who regards the world as he does the fortune of his own body can govern the world. He who loves the world as he does his own body can be entrusted with the world.
If a writer stops observing he is finished. But he does not have to observe consciously nor think how it will be useful. Perhaps that would be true at the beginning. But later everything he sees goes into the great reserve of things he knows or has seen.
The ideal teacher guides his students but does not pull them along; he urges them to go forward and does not suppress them; he opens the way but does not take them to the place.