““One of the worst things about being a motivational speaker, or any other kind of advocate for the power of positive thinking, must be the constant pressure to seem upbeat: if anyone ever catches you scowling, or stressed, or feeling sorry for yourself – all very normal occurrences for anybody, of course – it threatens to undermine everything you stand for. Becoming an advocate for the power of negative thinking, as I gradually did, holds no such hazard. Bad moods are permitted.””