If you're going to have a book full of clever people and nobody ever jokes, it's just not going to ring true to the reader. That said, humor writing is the hardest kind of writing there is.
Patrick RothfussI've got an idea for a modern day faerie tale that I think would made a great short novel. But I just don't have the time to work on it right now. I'm way too busy with the 'Kingkiller Chronicles' and being a new dad.
Patrick RothfussRemember this son, if you forget everything else. A poet is a musician who can't sing. Words have to find a man's mind before they can touch his heart. And, some men's minds are woeful small targets. Music touches their hearts directly, no matter how small or stubborn the mind of the man who listens.
Patrick RothfussThe key to good worldbuilding is leaving out most of what you create. You, as the author, had damn well better know the where all that dragon food comes from, but that doesn't mean that I, as a reader, want to read a five thousand word essay about you explaining it to me. I don't need to see the math, but I can tell by the details you provide whether or not you've thought these things through to their logical conclusions.
Patrick Rothfuss