This book is demanding because Novak understands that leadership isn't about techniques. It's about your own deep nature, your traits as a human being, and how you connect with other people at deep levels. Most business books tell you to do analysis; this one makes you do psychoanalysis, mostly of yourself, and that's a lot harder. Calculating free cash flow is easy. Being honest with yourself about whether you ever pretend to be something you're not, whether others see you as reliable, whether you really value the contributions of others -- that can leave you exhausted.