Book excerpt: The insight a patient shares into their own psychosis is fundamental to their condition - it goes to the heart of what we understand 'madness' to be. Can a person be expected to accept treatment for a condition that they deny they have? Can a person be held responsible for their actions if those actions are inspired by their own unique perceptions and beliefs - beliefs that no-one else shares? The new edition of this unique book shows how we can better understand the patient's view of their illness, and provides valuable advice for all those involved in the treatment of mental illness.