I think all of the best nonfiction that has ever been made comes from the result of someone who can't stop thinking about a certain topic - a very specific aspect of a certain topic in some cases. And second, they got really good at figuring out what they had to say about it.
Merlin MannAlthough your time and attention are finite, the demands on your time and attention are infinite.
Merlin MannEverything takes more time than you thought, everything costs more money than you thought, and almost everything turns out not quite as cool as you expected.
Merlin Mann