It's the questions we can't answer that teach us the most.
They teach us how to think.
If you give a man an answer, all he gains is a little fact, but give him a question and he'll look for his own answers. That way, when he finds the answers they will be precious to him.
The harder the question, the harder we hunt. The harder we hunt, the more we learn.
~The Name of the Wind by Patrick Rothfuss