The very quality of books to read and facts to master with which the twentieth-century man is confronted encourages him to think broadly and superficially about much, but hinders him from thinking deeply and thoroughly about anything.
On my hike my brain was left to wander. That was often maddening because it was tedious and monotonous sometimes, but then my the mind would take over, and that's when I'd start hearing the music in my head or thinking deeply about people I know or things that I didn't even know I remembered anymore. Those thoughts would be there. I wouldn't have had them otherwise.