Humor is important for is pacing. If your whole book is just drama drama drama, it's going to wear down the reader.
Patrick RothfussGenerally my favorite remarks always come from my readers. I've had people say my books made them laugh, or cry, or that it frightened them late at night.
Patrick RothfussElodin looked at me. "What a remarkably honest threat," he said. "Normally they're much more growlish and gristly than that." "Gristly?" I asked, emphasizing the 't.' "Don't you mean grisly?" "Both," he said. "Usually there's a lot of, 'I'll break your knees. I'll break your neck.'" He shrugged. "Makes me think of gristle, like when you're boning a chicken.
Patrick Rothfuss