Can

“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.”
― Patrick Rothfuss, The Wise Man's Fear

“Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?”
― J.K. Rowling, Harry Potter and the Deathly Hallows